Damp Proof Membrane

A damp-proof membrane safeguards a building's concrete slab against moisture that may permeate from the foundations. Additionally, it is a remarkably versatile product that can establish a protective layer or surface before installing wood or laminate flooring.

At Fastbuild Supplies, you can find a comprehensive selection of damp-proof membranes available in different sizes and thicknesses, complemented by top-notch jointing tape for seamless installation.

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What is a Damp Proof Membrane?

A damp proof membrane (DPM) acts as a barrier against opposing moisture to prevent rising dampness from developing in your home. It is often used under concrete flooring due to the high risk of moisture. 

Why is Damp Proof Membrane Important?

A damp-proof membrane is an essential tool during construction to enable safety and prevent rising dampness and damage. By carefully placing the DPM under concrete during construction, you can prevent a series of issues.

Here's a list of potential issues that would arise if a DPM is not installed:

  • Mould Growth
  • Fungal Decay
  • Skirting boards in complete disrepair
  • Decolourisation of wallpapers
  • Damp patches along the wall
  • Exposure to damp
  • Potential health risks

What is Rising Damp?

Rising damp refers to the upward movement of water from the ground through a vertical pathway, infiltrating a porous wall like a concrete floor. While less prevalent than other types of dampness, addressing rising dampness is of utmost importance in construction.

How to Find The Correct Damp Proof Membrane

Once you have collected the relative humidity data, you can determine the appropriate damp-proof membrane or liquid-damp-proofing system. This task involves carefully assessing the data with a property manager and conducting a thorough analysis to identify compatible damp-proof membranes.

Check the Moisture Levels Before Installing Damp Proof Membrane

Prior to installing a damp-proof membrane (DPM), it is vital to assess the moisture levels. Measuring the moisture content of the subfloor allows for a comparison with the guidelines provided by the product manufacturer. This information will determine whether a DPM is required and guide the selection of an appropriate DPM that suits your construction process.

Nevertheless, the Resin Flooring Association advises using a DPM, even if the moisture content exceeds the manufacturer's recommended threshold. This preventive measure accounts for potential property damage and unforeseen issues that may arise.

Pair Your DPM With a Damp Proofing Course

When dealing with walls and flooring, a damp proof course (DPC) is necessary in addition to the damp proof membrane (DPM).

A DPC is designed explicitly for brick walls and blocks to obstruct the infiltration of rising damp. By incorporating this additional safeguard, you establish a robust damp-proofing system that guarantees elevated levels of safety.

Deciding when to use a damp-proof membrane relies on understanding the water levels, the manufacturer's guidelines, and the season. Check out our knowledge hub for more information on construction and trading building supplies!