A damp-proof membrane is a plastic sheet used as an underlay for a concrete floor. This waterproof sheet is laid between the insulation layer and the sand base, and offers the concrete protection against damp. The concrete is then poured on top of the insulation. Common examples include:
Available from most builders' merchants, ground sheeting is made from a permeable material that allows water through but not soil particles or silt.
A flexible, fibrous board available in pre-cut strips used for creating expansion joints in large concrete pads.
Wall ties made from galvanized metal are used in the construction of cavity walls to connect the inner and out leaves or walls. They can also be used to join a new wall to an existing wall. There are various types of wall tie available but the three most common are the butterfly tie, fishtail tie and the mesh strip.
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