Damp Proof Membrane

A damp proof membrane (DPM) blocks ground moisture from penetrating floor and wall structures. This durable barrier is made from high-density polyethylene and provides long-term resistance to moisture ingress for concrete floors, screeds, and insulation systems.

What Is DPM Roll?

A DPM roll is a flexible polythene membrane supplied in a compact roll for quick, easy installation. It’s placed beneath floor structures, forming a moisture barrier between the sub-base and floor construction. Correctly installed DPM prevents rising damp, mould growth, and damage to the building fabric.

DPM rolls are manufactured in multiple gauge thicknesses to deliver the right level of moisture resistance. They come in clear and black finishes suited to different building types, including residential floors and industrial bases. DPM black is most common for flooring applications, and DPM clear is sometimes used for visibility in installation.

What Is Damp Proof Membrane Used For?

Damp proof membrane rolls safeguard floors and foundations from moisture-related damage. They are typically specified for the following uses:

• Under concrete slabs and floor screeds to prevent rising damp.
• As a vapour barrier beneath insulation systems.
• To protect timber and composite floors from ground moisture.
• In basements, foundations, and garages, for additional waterproofing.
• Beneath patios or extensions to prolong surface durability.
• Waterproofing in external paving or landscaping projects.

A DPM helps preserve the integrity and lifespan of the entire floor build-up.

Types Of DPM

We stock DPM rolls in various thickness gauges to meet different site and performance requirements. Thickness is measured in gauge (G), and  sometimes in microns (µm), with the most common being:

DPM 500G

This is a light-duty membrane suitable for smaller domestic jobs. It is best suited for use on shed bases, garden rooms, or where light flooring protection is required.

DPM 1000G

A medium-duty option that offers standard-grade protection. It’s ideal for general flooring, under-screed use, and residential projects.

DPM 1200G

Heavy-duty protection recommended for solid concrete floors and larger commercial builds. Perfect for high-traffic areas.

DPM 2000G

An extra heavy-duty membrane designed for industrial and high-moisture environments.

Note: Higher gauges deliver greater puncture and tear resistance for dependable on-site durability.

Benefits Of Damp Proof Membrane Roll

Installing a DPM roll provides enduring protection and on-site performance advantages, such as:

• Prevents ground moisture penetration.
• Reduces the risk of damp, mould, and corrosion.
• Protects flooring materials and insulation layers.
• Improves indoor air quality and comfort by reducing moisture transfer.
• Simple to trim, lay, and seal.
• Ensures long-term structural protection.
• Works effectively with concrete, timber, and insulation layers.
• Offered in robust black and transparent options to suit different site conditions.

Why Choose Our DPM In Black And Clear Colour?

Insulation Wholesale supply includes a professional range of damp proof membrane rolls designed for trade performance and compliance.

Here’s why trades and builders choose our DPM rolls:

• Made from high-grade polyethylene for superior strength and durability.
• Available in DPM 500G, DPM 1000G, and higher gauges.
• Suitable for domestic, commercial, and industrial projects.
• Clear product data sheets and installation guidance available.
• Competitive prices with bulk and trade discounts.
• Nationwide supply with next-day delivery available on most orders.

Keep moisture out of your build with our reliable DPM rolls, available in black and clear gauge thicknesses. Order today for fast UK delivery. 

FAQ

Why use damp proof membrane?

A DPM prevents moisture from rising through floors or walls, protecting your property from damp-related damage, including rot, mould, and decay.

Why damp proof membrane?

It ensures long-term structural stability and creates a dry, healthy indoor environment by blocking moisture at ground level.

Where do you put a damp proof membrane?

DPM rolls are typically installed below concrete slabs, screeds, or insulation layers. They’re sometimes used in walls or basements for extra waterproofing. Keep joints overlapped and sealed for complete coverage.

Where to buy damp proof membrane?

Buy quality damp proof membrane rolls directly from Insulation Wholesale. Choose from DPM black and DPM clear options in multiple gauges. We offer nationwide delivery, competitive pricing, and fast dispatch.