Unilit Floor Screeds and Concretes

UNILIT NATURAL HYDRAULIC LIME FLOOR SCREEDS AND LIME CONCRETES

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Telling Lime Products – Natural Hydraulic Lime Concrete and Screeds.
Telling manufacture and are distributors for a range of natural lime mortar products for various applications, together with stabilisation and consolidation grouts, mesh reinforcement and lime paints and finishes. The natural hydraulic lime products are manufactured using a modern day manufacturing process which replicates the strength, porosity, adhesion and flexibility of historic mortars.

The products are guaranteed against failure for 10 years and are warranted against defect under a professional indemnity insurance.


Lime Floors – Advantages
Unilit natural hydraulic lime allows the application of floor screeds to a considerable scale without the requirement for expansion or slip joints. The application of Unilit screeds will also prevent differential movement between the floor screed and the walls of lime built buildings. Application without a DPM will allow the floor to “breathe” with moisture from beneath the screed being evacuated through the screed as vapour preventing the build up of moisture below the floor and subsequent movement of salt laden water into the walls. Where stone, paving or tiles are then to be laid over the screed the use of a Unilit bedding mortar will ensure the performance of the screed is maintained and the compatibility of the mortar with the stone. The application of a hydraulic lime screed will be compatible with the application of Unilit 30 waterproofing and stabilising plaster to basement walls and up to 1 meter above ground level.

For application over insulation board with underfloor heating, the insulation boards should be bedded on a reasonable thickness of hardcore and a 20mm sand blinding, or a lime concrete (1 Unilit Fen X : 2 sharp sand : 1 coarse aggregate of approved grade) to ensure the solidity of the base for the screed, under floor heating can then be fixed to the insulation. The screed should be laid in two layers the first to the thickness of the heating pipes, approx 25 – 30mm. Telling Brick Mesh or stainless steel wire mesh reinforcement (approx. 5cm spacing) should then be laid into the screed (to absorb the thermal stresses in the flooring due to the heating system) and the second layer of screed applied over the mesh a minimum 30mm thick. Greater thickness can be applied up to 100mm total thickness for the two layers. Following layers or bedding layers should be applied 7 to 10 days after application.


Unilit FEN-XA – Natural Hydraulic Lime Binder
Unilit Fen-XA is recommended for use in place of cement in production of natural hydraulic lime concrete slabs and floor screeds. Unilit Fen-XA is a pure natural hydraulic lime binder designed to be gauged with the correct volume and quality of sand and water to produce a mortar for a variety of applications, including traditional and modern masonry work, re-pointing, backing layers in plasterwork and renders, finishing applications for both renders and lime washes as well as in floor screeds and lime concretes.

It is not permitted to add clinker, cement or any other synthetic binder.

The binder is mixed on site with the selected additives, such as sand and natural pigments, to create a mortar to suit the specific application. The use of sand with an optimum grain size is important (ideally according to the Füller-curves, with a maximum grain size of 4 mm) but the Unilit FEN-XA binder allows the use of sand which does not exactly meet these theoretical requirements. Coarse aggregates can be added for production of floor screeds and lime concretes.

Unilit FEN-XA conforms to European Standard ENV 495-1, NHL 2-3, 5 for natural hydraulic lime mortars.

Packaging: 25 kg bags, in powder form.
Density: 1000 kg/m3.
Tensile strength: 2.7 N/mm2 after 28 days; 3.0 N/mm2 after 60 days.
Compressive strength:
– Binder: 4.5 N/mm2 after 28 days; 6.0 N/mm2 after 60 days.
– Mortar: 2-9 N/mm2 after 28 days; 10 N/mm2 after 60 days.*
Modulus of elasticity: 6130 N/mm2.*
Volumetric stability: Stable.
Vapour diffusion resistance: µ= 13.7.
Fire classification: Non-flammable (M.O.)

* Variable mix strengths can be obtained by altering the mortar mix and aggregate size to suit the application. For lime concrete and floor screeds the addition of larger aggregates can result in far higher compressive and tensile strengths.

Contact Telling technical department for advice on the use of hydraulic lime admixtures.

Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Thickness: 50 – 300mm. Seek advice from Telling

Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/

Product reference: Unilit FEN-XA Natural Hydraulic Lime Binder.
Mix proportions: Seek advice from Telling. – Unilit Fen XA blended with sand and aggregates of approved grade. Proportions (Unilit Fen XA: total aggregate) 1:3
Application: Do not apply in temperatures below 5°C. Protection must be provided in conditions of excess heat or drying winds. The mortar remains workable for 2 hours and dries in 24-48 hours. Protect from frost for 48 to 72 hours.

Other requirements:
UNILIT NATURAL HYDRAULIC LIME CONCRETE AND SCREEDS
Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.

Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

General Information
The main components of a floor comprise a structural base and a screed topping created with natural hydraulic lime as the binder. The finished floors can be overlaid in different ways, with natural stone slabs or tiles ideally bedded in a natural hydraulic lime mortar, or with direct applications of carpet etc. laid directly on the levelled screed.

Lime floorings are waterproof, but at the same time permeable to water vapour. They ensure the passage of water vapour between the floor and the interior. Where rising damp is expected to occur this can freely evaporate through the lime screed preventing the build up of a hydrostatic pressure within the floor or building structure. The low salt content of the binder, as well as its permeability to water vapour eliminates all risk of efflorescence (salts) after the surface of the finished screed or the tiled flooring has dried.

The mortars must not be applied at temperatures below +5°C nor when a risk of frost exists. They should never be applied on to a frozen surface. The application instructions of the suppliers should be carefully followed with particular attention paid to the recommendations for drainage and protection.

Preparation:
Mortar droppings, construction dirt and debris etc. is to be removed and all surfaces require to be cleaned of excessive dust, oil, grease, etc.


SOIL PREPARATION AND COMPACTION
On a soil substrate the compaction of the base must be completed. This should be undertaken in two layers, each with a specific grading of gravel and sand.
The primary layer is constructed in rolled gravel type 4/7mm or 4/12mm to 4/20mm at a total thickness of between 200 mm and 500 mm, dependant upon the required performance of the floor and the anticipated loadings that are to occur. The secondary layer in coarse gravel forms a stable substrate for the lime flooring and provides the falls for drainage where required.
The final layer is applied in graded sand of 0/4mm at a thickness of 50 mm to 100 mm. Once applied, the top layer is laid flat and horizontal. A second layer of fine sand acts to bind the floor construction.
On excessively damp or wet soil, a layer of clay at a thickness of 50 mm to 100 mm can be applied prior to the application of the compacted gravels to create a water barrier which will protect the floor system from rising ground water. The clay layer is well compressed to maximise its water resistance properties.

BONDING BRIDGE LAYER
UNILIT 15/P2 – Bonding Bridge – Adhesive layer on a non-hydrophobic concrete slab

On a concrete substrate an adhesive bonding bridge is required. This layer consists of a natural hydraulic lime binder selected for its adhesive and flexural qualities. No addition of clinker, cements or other synthetic additives are permitted. The maximum granulation size will be 2 mm. The day before the application of the bonding, the concrete surfaces need to be cleaned and dampened down. One to two hours before the application of the adhesive layer the surface is lightly dampened once again.

Properties:
Granular sizing: max. 2 mm
Specific gravity: 1580 kg/m³
Compressive strength: 4 N/mm² after 60 days, 6 N/mm² after 90 days
Adhesive strength (DIN 18.555): > 2 N/mm²
Moisture diffusion resistance (µ): 10
pH-value: > 10.5
Fire resistance classification: Class M0 (non-flammable)
Consumption: ~ 15 kg/m²/cm
Packing: powder in bags of 30 kg

Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.

Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Thickness: nominal thickness 5 – 10mm
Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/

Product Reference: Unilit 15P2
Mix: Premixed natural hydraulic lime. The mortar is mixed with clean water at a ratio of 5 litres of water to a bag of 30 kg ready mixed natural hydraulic lime powder. Mixing is undertaken with a slow speed electric paddle for a period of 3 to 5 minutes. A creamy workable mortar is obtained, which has approximately 2 hours of open time.
Application: The mortar is applied by steel trowel at an nominal thickness of 5 – 10mm. A drying time of 1 to 2 days is required although this may be shorter in good drying conditions. This adhesive layer needs to be protected against frost for 3 days following application. If the concrete floor slab has been prepared with a waterproofer, contact Telling technical services department for advice.

SCREED-SLAB LAYER

UNILIT Fen XA Lime Concrete – Ground Floor – Structural Slab

On a substrate of levelled sand, a slab is cast with a binder of natural hydraulic lime. No addition of clinker, cements or any other synthetic additives are allowed. The binder is mechanically mixed on site with the selected aggregates. The maximum granule sizing is to be 7mm to 20 mm, dependant upon the desired compressive strength of the slab.

Binder properties:
Specific gravity: 1000 kg/m³
Moisture diffusion resistance (µ): 13.7
pH-value: > 10.5
Fire resistance classification: Class M0 (non-flammable)
Consumption: ~ 2,5 kg/m²/cm
Packing: powder in bags of 25 kg

Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.

Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Thickness: 50 to 300mm. Seek advice from Telling.

Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/

Product Reference: Unilit Fen XA & aggregates of approved grade – seek advice form Telling.

Mix: The composition of the matrix for the structural slab will be:
– Unilit Fen XA Natural Hydraulic Lime by volume 4 parts
– graded sand 0/4 9 parts
– rolled gravel 4/7 to 4/20 3 parts

The mortar is mixed with clean water until a reasonable dry, though sufficiently hydrated ground mortar is obtained.

Application: While levelling the surface of the structural slab with a timber rule, a fine layer of lime fat should occur on the worked surface. After the application at a thickness of 50mm to 300 mm, dependant upon the anticipated load to be applied in performance and whether a system of under floor heating is installed, the ground mortar is ruled flat and finished with a wood float.

Other Requirements: The slab/ground mortar must be allowed to dry for 1 to 2 weeks and benefits from regular dampening down during conditions of dry weather and high temperatures.

Finish: Wood float or lightly keyed for following layers

UNILIT Fen XA – Screeds for existing floor slabs

On an existing floor slab the screeds are prepared with a binder of natural hydraulic lime. No addition of clinker, cements or any other synthetic additives are allowed. The binder is mixed on site with the selected aggregates. The maximum granular sizing will be 4mm to 7 mm. where larger aggregates are used the thickness of the screed should be increased – seek advice from Telling.

Binder properties
Specific gravity: 1000 kg/m³
Moisture diffusion resistance (µ): 13.7
pH-value: > 10.5
Fire resistance classification: Class M0 (non-flammable)
Consumption: ~ 2.5 kg/m²/cm
Packing: powder in bags of 25 kg

Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.

Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Thickness: depending on the base, application, and aggregates: 50 – 100mm

Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/

Product Reference: Unilit Fen XA & aggregates of approved grade – seek advice form Telling.

Mix: The composition of the mortar for the screed layer is:
– Unilit Fen X A natural hydraulic lime by volume 1 part
– graded sand 0/4 to 0/7mm 3 parts

The mortar is mixed with clean water until a semi-dry, though sufficiently hydrated mortar is obtained. During the levelling of the screed layer with a wooden float a fine layer of lime fat should occur on the worked surface. Application:

The screed will be laid to a thickness of between 50mm and 100 mm, dependant upon the loads to be applied under use and whether or not an underfloor system of floor heating is being installed. The lime screeds are ruled flat and finished with a wood float. The laid mortar requires to dry for 1 to 2 weeks, while regularly being dampened down during conditions of dry weather and high temperatures.

Finish: Wood float or lightly keyed for following layers

Unilit 30. – Waterproofing and stabilising screed layer.

A dry, premixed mineral stabilising mortar based on hydraulic, naturally pure and selected lime. Designed particularly for situations where rising damp or capillary action are prevalent, or where a waterproof mortar is required, the mortar is characterised by a high plasticity, slow but strong bonding and a low salt content.
Unilit 30 is impermeable to water but very vapour permeable and can be used as a waterproof layer within the floor screed construction to prevent the passage of water liquid while allowing moisture to evaporate through its structure as vapour. The mortar can also be applied to damp walls of buildings and cellars.
The minimum total layer thickness of Unilit 30 must be 20mm.

Colour: Beige.
Packaging: 30 kg bags, in powder form.
Density: 1600 kg/m3.
Tensile strength: 0.6 N/mm2.
Compressive strength: 7 N/mm2.
Modulus of elasticity: 6130 N/mm2.
Vapour diffusion resistance: µ= 10.
Coefficient of thermal conductivity: 0.65 W/m °K.
pH: > 10.5.
Fire classification: Non-flammable (M.O.)

Consult Telling technical service department for advice on the suitability of the substrate.

Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Thickness: minimum nominal thickness 20mm. seek advice from Telling

Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/

Product Reference: Unilit 30 breathable waterproof layer

Mix: Premixed Waterproofing and stabilising natural hydraulic lime mortar.

The mortar is then mixed with clean water at a ratio of 5 litres of water to 30 kgs of prepared powder again with the paddle whisk for a duration of 3 to 5 minutes. As creamy and workable consistency is achieved with an open time of approximately about 2 hours.

Application:
A minimum of four days after the laying of the base layer and dependent on the weather conditions, the waterproof layer is applied to a minimum thickness of 20mm – nominal thickness of 25 mm. The finishing layer is subsequently floated and steel trowelled. The screed finishing layer requires to dry for 1 week before use and during conditions of dry weather and high temperatures it will be necessary to regularly dampen down the finished screed.

Finish: Wood float or lightly keyed for following layers.

Do not apply in temperatures below 5°C or above 40°C. The mortar remains workable for 2 hours and dries in 24-48 hours. Protect from frost for 48 to 72 hours.
Other requirements: Where Unilit 30 has fully dried before application of following layers a bonding bridge of Unilit 15P2 is required, unless an adhesive mortar is used in the bedding layer or wearing screed – specify in this clause. Seek advice from Telling.


SCREED-FINISHING LAYERS

UNILIT 15/P1 – UNILIT 40 – Hydraulic Lime Wearing Screeds – finishing layer with normal loading

When the screed is selected as the final finish of a floor with only normal loadings to be applied, a smooth, resilient and water repellent finishing layer is applied which can be pre-coloured where required. This finishing layer is manufactured from a natural hydraulic lime binder with carefully selected aggregates, water repellent additives and natural ochre pigments. No addition of clinker, cements or any other synthetic additives are permitted. The prepared blend of binders are mixed on site already containing the selected aggregate of a maximum granular size of 1 mm.

The colour of the finishing layer is determined by discussion with the architect. A sample will be prepared for approval prior to manufacture. Prior to the application of the finishing layer the base screeds are lightly dampened.

Properties adhesive mortar:
Grain size: max. 1 mm
Specific gravity: 1580 kg/m³
Compressive strength: 4 N/mm² after 60 days, 6 N/mm² after 90 days
Adhesive strength (DIN 18.555): > 2 N/mm²
Moisture diffusion resistance (µ): 10
pH-value: > 10.5
Fire resistance classification: Class M0 (non-flammable)
Consumption: ~ 4 kg/m²
Packing: powder in bags of 30 kg

Properties water repellent mortar:
Grain size max. 0,7 mm
Specific gravity 1450 kg/m³
Modulus of Elasticity 6130 N/mm²
Compressive strength 5 N/mm² after 60 days
6 N/mm² after 90 days
Tensile strength 0,5 N/mm²
Moisture diffusion resistance (µ) 10
Thermal conduction coefficient (l) 0.67 W/mK
Capillary water absorption coefficient 0.19 litres/m²Öh
pH-value > 10.5
Fire resistance classification Class M0 (non-flammable)
Consumption ~ 4 kg/m²
Packing powder in bags of 30 kg
Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.
Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.
Thickness: minimum nominal thickness 5mm. seek advice from Telling
Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/
Product Reference: Unilit 10 : Unilit 35
Mix: The specific properties of the finishing layer are achieved by the site blending in equal proportions of a ready mixed adhesive mortar (Unilit 15) with a ready mixed water repellent mortar (Unilit 40). The addition of natural ochre’s allows the finishing layers to pigmented to the desired colour.
The composition of the mortar for the equalisation-finishing layer is:
– adhesive mortar Unilit 15 1 part
– water repellent mortar – Unilit 40 1 part
– natural ochre pigments by weight to an absolute maximum of 15 m%)
The adhesive, water repellent mortar and the natural ochre pigments are first dry mixed by means of a slow speed electric paddle mixer. The mortar for the finishing layer is then mixed with clean water at a ratio of 5 litres of water to 30 kgs of prepared powder again with the paddle whisk for a duration of 3 to 5 minutes. As creamy and workable consistency is achieved with an open time of approximately about 2 hours.
Application:
A minimum of four days after the laying of the base layer and dependent on the weather conditions, finishing layer is applied in two passes, fresh on fresh, to an overall and nominal thickness of 5 mm. The finishing layer is subsequently floated and steel trowelled. The screed finishing layer requires to dry for 1 week before use and during conditions of dry weather and high temperatures it will be necessary to regularly dampen down the finished screed.
Finish: steel or wood float

UNILIT 10 – UNILIT 35 – Heavy Loading – Natural Hydraulic Lime Wearing Screed finishing layer

If the screed is to be final finish of a floor and heavy loads are to be applied, a textured, longwearing finishing layer is needed, which can be pre-coloured where required. This layer consists of a natural hydraulic lime binder with selected aggregates and natural ochre pigments. No addition of clinker, cements or any other synthetic additives are permitted. The binder is mixed on site with the selected aggregates. The maximum granular sizing will be 4 mm. The colour of the finishing layer is determined by discussion with the architect. A sample will be prepared for approval prior to manufacture. Prior to the application of the screed layer the existing substrate should be slightly dampened.

Properties adhesive mortar:
Grain size max. 4 mm
Specific gravity 1500 kg/m³
Compressive strength 4 N/mm² after 60 days
6 N/mm² after 90 days
Adhesive strength (DIN 18.555) > 2 N/mm²
Moisture diffusion resistance (µ) < 8 pH-value > 10.5
Fire resistance classification Class M0 (non-flammable)
Consumption ~ 8 kg/m²/cm
Packing powder in bags of 30 kg

Properties coarse mortar:
Grain size max. 3 mm
Specific gravity 1600 kg/m³
Modulus of elasticity 6130 N/mm²
Compressive strength 9 N/mm² after 60 days
10 N/mm² after 90 days
Tensile strength 0,6 N/mm²
Moisture diffusion resistance (µ) 13.7
pH-value > 10.5
Fire resistance classification Class M0 (non-flammable)
Consumption ~ 8 kg/m²/cm
Packing powder in bags of 30 kg
Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.
Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Thickness: minimum 10mm (premixed): 40mm with additional coarse aggregates. seek advice from Telling
Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/
Product Reference: Unilit 10 : Unilit 35
Mix: The specific properties of the screed layer are achieved by the site blending in equal proportions of a ready mix adhesive,(Unilit 10) mortar with a ready mix coarse mortar (Unilit 35). The addition of natural ochre’s allows the finishing layer to be prepared to a desired colour.
The composition of the mortar for the equalisation-finishing layer is:
– adhesive mortar Unilit 10 1 part
– coarse mortar – Unilit 35 1 part
– natural ochre pigments some weight percentages (absolute maximum of 15 m%)
The adhesive mortar (Unilit 10), the coarse mortar (Unilit 35) and the natural ochre pigments are dry mixed by means of a slow speed electric mixer. The mortar for the screed is then mixed with clean water at a ratio of 6.5 litres of water to a 30 kg bag of powder. Mixing is undertaken with a slow speed electric paddle mixer for a period of 3 to 5 minutes. A creamy and workable mortar is achieved with an open working time of approximately 2 hours.
Application: At least 4 days after the base screed is laid, dependent on the weather conditions, the final screed layer is applied in one coat of a total nominal thickness of 10 mm. The finishing layer is laid flat and steel trowelled or woodfloated. The finishing screed layer will need to dry for 1 week with regular and light dampened required during dry and hot weather conditions.
Finish: steel or wood float

UNILIT 45 Natural Hydraulic Lime Bedding layer – Tiled floor with normal loading

When a floor with a normal loading is to be finished with tile, a bedding layer is applied, comprising a natural hydraulic lime binder with selected additives. No clinker, cements or any other synthetic additives are allowed. The maximum granular sizing will be 0.7 mm. Prior to the application of this finishing screed layer the substrate should be lightly dampened.
Properties.
Grain size max. 0.7 mm
Specific gravity 1400 kg/m³
Modulus of Elasticity 6130 N/mm²
Compressive strength 4 N/mm² after 60 days
5 N/mm² after 90 days
Tensile strength 0,5 N/mm²
Moisture diffusion resistance (µ) 10
Thermal conduction coefficient (l) 0,30 W/mK
pH-value > 10.5
Fire resistance classification Class M0 (non-flammable)
Consumption ~ 7 kg/m²
Packing powder in bags of 30 kg
Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.
Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.
Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/
Application:
The mortar is mixed with clean water at a ratio of 5 litres of water to a bag of 30 kg ready mixed natural hydraulic lime mortar. Mixing is undertaken with a slow speed electric paddle mixer for a period of 3 to 5 minutes. A creamy and workable mortar is achieved which will have an open working time of approximately 2 hours.
At least 4 days after the base floor was applied, and dependent on the weather conditions, the final screed layer is applied in one coat of a nominal thickness of 3mm to 5 mm. The tiles are laid in to this bedding layer and pressed tightly into the mortar bed. Any excess mortar squeezing out of the joints, which are to be a thickness of 0,5 to 3 mm (traditional tile work), is wiped away carefully with a clean sponge.
With terracotta and other porous tiles or slabs, a light dampening of the tiles with a knapsack sprayer is necessary before placing the tiles into the fresh mortar bed. However, the tiles should not to be immersed in water or saturated. A drying period of 1 to 2 days has to be observed before the finished tiled flooring can be walked upon. Normally the joints are finished in the process of the laying and the cleaning of the tiles with a sponge. If necessary however the joints can be grouted afterwards.

UNILIT 35 or UNILIT 35M Natural Hydraulic Lime Bedding Layer – Tiled floor with heavy loading

When a floor with high loading is to be finished with tiles, the tiles are either laid and pushed firmly into the fresh mortar of the screed or bonded with an adhesive bed layer as a separate operation. The adhesive bedding layer comprises a natural hydraulic lime binder with selected additives. No addition of clinker, cements or any other synthetic additives are allowed. The maximum granular sizing varies from 1,7 mm to 3 mm, dependant upon the thickness of the adhesive bed depth.

Properties:
Grain size:
UNILIT 35M: max. 1.7 mm
UNILIT 35: max. 3 mm
Specific gravity: 1600 kg/m³
Compressive strength:
UNILIT 35M:
7 N/mm² after 60 days
10 N/mm² after 90 days
UNILIT 35:
9 N/mm² after 60 days
10 N/mm² after 90 days
Tensile strength: 0,6 N/mm²
Moisture diffusion resistance (µ): 1.7
Thermal conduction coefficient (l): 0.65 W/mK
pH-value: > 10.5
Fire resistance classification: Class M0 (non-flammable)
Consumption: ~ 16 kg/m²/cm
Packing: powder in bags of 30 kg

Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.

Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/

Application:
The mortar is mixed with clean water at a ratio of 5 litres of water to a bag of 30 kg ready mixed natural hydraulic lime powder. Mixing is undertaken with a slow speed electric mixer for a period of 3 to 5 minutes. As such a very good workable mortar is obtained, which can be used for about 2 hours. A minimum of 4 days after the laying of the base screed, and dependant upon weather conditions, the adhesive layer is applied to a nominal thickness of 5 mm for a maximum grain size of 1,7 mm, or nominally 10 to 15 mm, for a maximum grain size of 3 mm. The tiles are laid and pushed tightly into the fresh mortar bed. Allow a drying period of 1 to 2 days to be observed before the finished tiles are walked upon. The pointing/grouting is carried out as a separate operation at a later date.

Unilit 15 Adhesive Mortars.
A range of 2 adhesive layers based on natural hydraulic lime and appropriate additional aggregates and formulated to maximise the mortars bonding properties to dense stone, or high density cement based masonry, cast stone, glazed brick, etc. Unilit 15 can also be blended with Unilit 35 or Unilit 45 to produce a coarse or fine adhesive mortar with excellent adhesive, flexibility, vapour permeability, strength, and workability properties and ensure the ease of application.
Unilit 15/P1 has a maximum granulation of 1 mm and is designed for tight mortar joints up to 5mm wide.
Unilit 15 P2 has a maximum granulation of 2mm and is designed for mortar joints greater than 5mm wide.
Colour: Beige.
Packaging: 30 kg bags, in powder form.
Density: 1600 kg/m3.
Bending – tensile strength: 4 N/mm2 after 60 days; 6 N/mm2 after 90 days.
Bonding strength (DIN 18.555): 2 N/mm2.
pH: > 10.5.
Maximum granular size:
– Unilit 15/P1: 1 mm.
– Unilit 15/P2: 2 mm.
Consult Telling technical service department for advice on the suitability of the substrate.
Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Mix: Premixed natural hydraulic lime mortar.
Mix proportions: Seek advice from Telling.
Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: www.telling.co.uk
Product reference: Unilit 15 P1/P2 hydraulic lime mortar.
Preparation: The substrate must be clean and free of all traces of oil and grease. When the substrate has been treated with an impregnating product (silicones or similar) it is recommended to consult the supplier or manufacturer.
Application: Mix Unilit 15 with clean water – 4.5 to 5.25 litres of water to 30 kg of powder depending on the temperature and substrate. Mix with either a concrete mixer or mechanical whisk for a sufficient duration to achieve a creamy consistency which will be naturally light and viscous.
Do not use mortar if the substrate has been saturated by rainfall. Do not apply in temperatures below 5°C. Protection must be provided in conditions of excess heat or drying winds as well as from frost for 48 to 72 hours.
Sand source/type: Not applicable – mortar pre mixed.

Unilit 35: Unilit 15 P2.
A coarse masonry mortar can be produced by blending Unilit 35 and Unilit 15P2 in equal proportions. The mortar combines the adhesive properties of Unilit 15 with the strength, flexibility and workability of Unilit 35, and produces a highly workable adhesive mortar ensuring the ease of application. For technical properties of Unilit 15 and Unilit 35 see relevant sections for each mortar.

Application: The specific properties of the mortar are achieved by the site blending in equal proportions of a ready mixed adhesive mortar (Unilit 15 P2) with a ready mixed coarse mortar (Unilit 35). The addition of natural ochre’s allows the finishing layers to pigmented to the desired colour.
Consult Telling technical service department for advice on the suitability of the substrate.
Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Thickness: Minimum 10mm as bedding or finishing layer
Mix: Premixed natural hydraulic lime mortar.
Mix proportions: (1:1 Unilit 35:Unilit 15P2) + up to15% by weight Natural Earth Ochre Pigments – Seek advice from Telling.
Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/
Product reference: Unilit 35:Unilit 15P2 hydraulic lime mortars.
Preparation: The substrate must be clean and free of all traces of oil and grease. When the substrate has been treated with an impregnating product (silicones or similar) it is recommended to consult the supplier or manufacturer.
Application: The adhesive, coarse mortar and the natural ochre pigments are first dry mixed by means of a slow speed electric paddle mixer. The mortar is then mixed with clean water at a ratio of 5 litres of water to 30 kgs of prepared powder again with the paddle whisk for a duration of 3 to 5 minutes. As creamy and workable consistency is achieved with an open time of approximately about 2 hours.
Apply directly to dry substrates. If the substrate is too dry, dampen down the surface prior to application. Do not apply in temperatures below 5°C or above 40°C. The mortar remains workable for 2 hours and dries in 24-48 hours. Protect from frost for 48 to 72 hours.
Sand source/type: Not applicable – mortar pre-mixed.

Unilit 45:Unilit 15 P1.
A fine masonry mortar can be produced by blending Unilit 45 and Unilit 15P1 in equal proportions. The mortar combines the adhesive properties of Unilit 15 with the strength, flexibility and workability of Unilit 45, and produces a highly workable adhesive mortar ensuring the ease of application. For technical properties of Unilit 15 and Unilit 45 see relevant sections for each mortar.

Application: The specific properties of the mortar are achieved by the site blending in equal proportions of a ready mixed adhesive mortar (Unilit 15 P1) with a ready mixed fine masonry mortar (Unilit 45). The addition of natural ochre’s allows the finishing layers to pigmented to the desired colour.
Consult Telling technical service department for advice on the suitability of the substrate.
Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Thickness: 3 – 7mm as bedding or finishing layer
Mix: Premixed natural hydraulic lime mortar.
Mix proportions: (1:1 Unilit 45:Unilit 15P1) + up to15% by weight Natural Earth Ochre Pigments – Seek advice from Telling.
Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/

Product reference: Unilit 45: Unilit 15P1
Preparation: The substrate must be clean and free of all traces of oil and grease. When the substrate has been treated with an impregnating product (silicones or similar) it is recommended to consult the supplier or manufacturer.
Application: The adhesive, coarse mortar and the natural ochre pigments are first dry mixed by means of a slow speed electric paddle mixer. The mortar is then mixed with clean water at a ratio of 5 litres of water to 30 kgs of prepared powder again with the paddle whisk for a duration of 3 to 5 minutes. As creamy and workable consistency is achieved with an open time of approximately about 2 hours.
Apply directly to dry substrates. If the substrate is too dry, dampen down the surface prior to application. Do not apply in temperatures below 5°C or above 40°C. The mortar remains workable for 2 hours and dries in 24-48 hours. Protect from frost for 48 to 72 hours.
Sand source/type: Not applicable – mortar pre-mixed.

FINISHED FLOORING
Water-proofing the finished screeds – Beeswax coating for polished/ natural lime floors

To protect and make the surface resilient to water when the screed is to be left exposed, the surface can be impregnated with beeswax. The beeswax should not be applied for three or four weeks after the laying of the screed. This is applied in a first layer until a complete saturation of the surface is achieved. A second layer of beeswax, acting as a protection of the first layer, is applied 3 to 4 days later. It is normal thereafter every 6 months as normal maintenance of the floor, for a new layer of beeswax to be applied and subsequently polished. For the regular, daily maintenance of the floor it is advisable to clean the surface by means of a lukewarm suds of Marseilles’ soap and linseed oil (style CAROLIN).

UNILIT 35, UNILIT 35M or UNILIT 45
Pointing of the tiled floor

For the pointing of the tiled floor a mortar is applied, comprised of a pure natural hydraulic lime binder with selected additives and natural ochre pigments, if necessary enriched with selected pozzolanic material to ensure the consistent hydraulicity of the finished product. No addition of clinker, cements or any other synthetic additives are allowed. For thin joint widths of 2-3 millimetres the maximum granular sizing of 0.7 mm will apply. For medium joint widths of 3- 10 mm a maximum granular sizing of 1.7 mm will apply up to 3mm for even wider joints up to 15 mm.

The colour of the finishing layer is selected by the architect. A sample should be made available for inspection prior to manufacture.

Properties:
Grain size UNILIT 45 max. 0,7 mm
UNILIT 35M max. 1,7 mm
UNILIT 35 max. 3 mm
Specific gravity
UNILIT 45 1400 kg/m³
UNILIT 35 – 35M 1600 kg/m³
Tensile strength 0,5 N/mm²
Moisture diffusion resistance (µ) > 10
pH-value > 10,5
Fire resistance classification Class M0 (non-flammable)
Packing powder in bags of 30 kg
Colour Beige or with Natural Earth Ochre Pigment
Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.
Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

Mix: Premixed natural hydraulic lime:sand mortar
Manufacturer: Telling Lime Products Limited, Primrose Avenue, Fordhouses, Wolverhampton, WV10 8AW. Tel: 01902 789 777. Fax: 01902 398 777. Email: info@telling.co.uk Web: http://www.telling.co.uk/
Product Reference: Unilit 35 / 35M / 45
Application:
The mortar is mixed with clean water at a ratio of 5 litres of water to a 30 kg bag of ready mix natural hydraulic lime mortar. Mixing is undertaken with a slow speed electric paddle mixer for a period of 3 to 5 minutes. As creamy and workable mortar is achieved which will have an open working time of approximately 2 hours. Allow a minimum of 1 to 2 days after the laying of the floor tiles before the joints are filled and finished with the appropriate pointing tools. In the case of very narrow joints grouting is undertaken with a more liquid mortar by means of a gun or needle . Excess mortar is wiped away neatly with a sponge. A drying period of 1 to 2 days has to be respected, before the finished tiled flooring can be walked upon.

UNDER FLOOR HEATING

Thermal insulation

A rigid thermal insulation layer in Foamglas or similar is placed directly on the prepared soil base or the existing floor slab. The thickness of the insulation layer is dictated by the desired insulation value of the floor and the available thickness of the insulation slabs. The calculation value of the thermal conductivity coefficient is 0,042 W/mK.

System for floor heating

The under floor heating system is laid directly on the insulation on mechanically fixed spacers. Following the mounting of the pipes for the heating system, the screed materials are applied in two layers in accordance with the methods and specifications outlined above. The first layer of the screed is applied to cover the pipes of the floor heating system, while the second layer is applied flat at a minimum thickness of 50 mm. In between the layers a brick mesh or similar reinforcement is introduced to absorb the thermal stresses in the flooring, due to the heating system.

Contact Telling technical department for advice on the mix design and use of hydraulic lime concrete and screeds, or for further information on waterproofing breathable screeds.
Consult with Unilit technical literature for details. Hydraulic lime mortars are specialist products and it is recommended that Telling Lime Products are consulted early in the design process.

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