Lime Concrete Screed
It is a commonly held belief that concrete and wearing screeds can only be created with cementitious materials. This is not the case as the selection of binder, aggregate grading and mix ratio enable the creation of ‘lime concrete, Unilit floor screeds, stone, tile and flags bedding and pointing and in conjunction with insulation and under floor heating systems.
Natural hydraulic lime allows the application of slabs and floor screeds in large areas without the requirement for expansion or slip joints. These 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 evacuated as a vapour. This prevents hydrostatic pressure which causes the diversion of salt laden water into the walls. Where stone, paving or tiles are 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 natural hydraulic lime screed complements the application of Unilit 30 waterproofing and stabilising plaster to basement walls and up to 1 metre above ground level.
Unilit screeds can be applied over insulation boards and in conjunction with underfloor heating. The enhanced stability, open pore structure and low coefficient of thermal expansion of hydraulic lime mortars prevents the build up of moisture within the floor, removes the risk of thermal movement, and produces an improved storage of heat within the floor when compared to cement screeds.
The use of TECHNOpor as an insulating structural base will improve the thermal performance of the floor while providing a stable base and maintaining the breathability of the floor.