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Damp Proofing

DAMP PROOF MEMBRANES

DAMP PROOF MEMBRANES ARE A CRITICAL COMPONENT IN A CONSTRUCTION

Failures occurring once a Damp Proof Membrane is installed are extremely difficult and costly to rectify. Membranes carrying inadequate or even no accreditation at all can jeopardise the waterproofing of a building. The quality of the Damp Proof Membrane used should therefore not be compromised. Gas Resistant membranes should be used to prevent the passage of methane, radon and carbon dioxide into a dwelling where the site survey has indicated such a risk exists. In areas where gas emissions are considered a risk it can be more cost effective to install a gas resistant membrane than to have a survey taken!

INSTALLATION

Damp Proof Membranes (DPM) must be continuous with the Damp Proof Course (DPC) in the surrounding walls. A surface of blinding or soft sand should be used to avoid damage to the membrane both during installation and when the concrete or screed or other protective layer is installed. Care should be taken to ensure that the membrane is not stretched or displaced when placing the concrete or screed over the membrane. Sufficient allowance should be made to avoid creating areas of unsupported membrane.

DAMP PROOF MEMBRANES NEED TO BE JOINTED

A jointing system provides damp proofing integrity at joints in Damp Proof Membranes or laps with the Damp Proof Course. Haldane Fisher can supply a wide range of cost effective and durable DPC’s. To avoid rising damp in walls a layer of impervious material is placed between brick courses in walls. Damp-proof courses are also installed around windows, doors and under parapets.

DPC and DPM products should all conform with the Building Regulations 1991 Approved Document C and amendments 1992.