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A structural DPM (damp proof membrane) is a method of protecting your structure from damp-related issues due to moisture from the ground rising through a concrete slab via capillary action. The damp proof membrane itself is a thin, sheet material that is typically laid beneath the concrete slab to create a physical barrier between the moisture in the ground and the structural concrete.

If you have an existing concrete slab that is experiencing issues with rising damp or moisture ingress, it may be worth considering a liquid-applied epoxy damp proofing membrane instead.

Requirements for Damp Proof Membranes

Approved Document C: Site preparation and resistance to contaminants and moisture, proposes that a damp proof membrane below the concrete could be formed with a sheet of polyethylene which should be at least 300μm thick (1200 gauge) with sealed joints and laid on a bed of material that will not damage the sheet.

Using a thinner sheet could mean your building doesn't comply with regulations, and would require a costly solution to rectify the issue. It is also possible to obtain structural DPM sheets with a greater thickness than 1200 gauge in circumstances where additional protection is required.

If you're unsure of the required DPM thickness on your project, make sure to check with your architect or structural engineer, or see what is required by your local authority.

DPMs and DPCs

There are numerous different types of damp proof membranes that can and should be used across many areas of construction, particularly where buildings could experience issues with damp.

However, a structural damp proof membrane (DPM) will commonly be laid during the construction of a concrete floor in a new build to protect the floor from rising damp.

Another common type of damp proofing is known as damp proof course (DPC). Damp proof courses do differ in their application however, as they are specifically designed to combat rising damp within structural walls, whereas a DPM is normally used in floors.

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If you require assistance with structural damp proof membranes or need advice on which structural DPM is best suited for your requirements, contact our friendly teams in Kent - 01732 906 826 - or Leeds - 0113 521 6789.

Return to our full range of Damp Proofing products.

Frequently Asked Questions About Structural DPMs

What is a structural DPM (Damp Proof Membrane) and why is it used?

A structural DPM is a sheet membrane designed to provide a waterproof barrier beneath concrete slabs to prevent moisture ingress from the ground. It acts as a protective layer, preventing dampness, rising moisture, and potential damage to the concrete slab and the structure above it.

How does a structural DPM work?

A structural DPM is typically installed directly onto the prepared subgrade before pouring the concrete slab. It forms a continuous waterproof barrier that prevents moisture from seeping into the concrete, ensuring the slab remains dry and free from damp-related issues.

When should I consider using a structural DPM?

Structural DPMs are recommended for use in various applications where moisture ingress from the ground is a concern, such as basement floors, ground-supported slabs, car parks, and industrial flooring. They are essential for protecting concrete slabs from rising dampness and groundwater infiltration.

Do structural DPMs require protection during construction?

Yes, structural DPMs may require protection during construction to prevent damage from construction activities, foot traffic, and sharp objects. Temporary protection such as geotextile fabric or hardboard may be used to shield the membrane until the concrete slab is poured and cured.

Are structural DPMs compatible with other concrete reinforcement or admixtures?

Yes, structural DPMs are generally compatible with other concrete reinforcement materials and admixtures used in the construction of concrete slabs. However, it’s essential to ensure that the membrane is properly installed and protected to maintain its integrity and effectiveness.

Can structural DPMs be used in conjunction with other waterproofing measures?

Yes, structural DPMs can be used in conjunction with other waterproofing measures, such as external damp proof courses, drainage systems, and waterproofing coatings, to provide comprehensive protection against moisture ingress and damp-related issues.

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