Damp Proofing and Masonry Essentials

Moisture protection and structural stability start with the right materials. We stock practical damp proofing products and wall ties for new builds, extensions, renovations and general masonry work.

Our range focuses on commonly specified sizes and durable materials:

• Floor protection: Use a damp-proof membrane beneath concrete floors to help stop moisture rising through the structure.
• Wall protection: Install a damp proof course in brick, block, stone or concrete walls to create a physical moisture barrier.
• Cavity wall construction: Choose stainless steel cavity wall ties to connect the inner and outer leaves of a cavity wall.
• Heavy-duty coverage: The 300mu 1200-gauge DPM sheet measures 4m x 25m and provides 100m² of coverage.

Damp-Proof Membrane for Concrete Floors

A damp-proof membrane helps prevent ground moisture from passing into a concrete floor. It is commonly installed during floor construction, groundwork and foundation projects.

Our DPM sheet range includes different thicknesses for different site requirements. Options include 300mu 1200-gauge and 500mu 2000-gauge polythene sheets.

The sheets are waterproof, rot-proof and hard-wearing. Select the membrane required by your project specification and allow enough material for overlaps and upstands.

Damp Proof Course Rolls

A damp proof course stops moisture rising through porous masonry by capillary action. It is used in horizontal and vertical applications across brick, block, stone and concrete construction.

Supreme Merchants supplies 30m DPC rolls in widths from 100mm to 600mm. This makes it easier to match the material to different wall widths and details.

The diamond-embossed surface helps the DPC bond with mortar. Popular options include:

• 100mm x 30m damp proof course
• 150mm x 30m DPC roll
• 300mm x 30m DPC roll
• 450mm x 30m damp proof course

Stainless Steel Cavity Wall Ties

Wall ties connect the two leaves of a cavity wall and help them work as one stable structure. The correct length depends on the cavity width, masonry construction and required embedment.

Our stainless steel Type 4 cavity wall ties are supplied in boxes of 250. Available lengths include 200mm, 225mm, 250mm and 275mm.

Choose the size stated in your building design or structural specification. Seek professional advice if you are unsure which wall tie is suitable.

Order DPM, DPC and Wall Ties Online

Supreme Merchants supplies building materials to trade and DIY customers at competitive prices. Multi-buy discounts are available on selected products, with credit options for eligible customers.

Order online for fast nationwide delivery. Current charges, delivery dates and free-delivery thresholds are shown at checkout.

Need help selecting a DPM sheet, DPC width or wall tie length? Call 0113 204 7303 for product guidance or a price on an item that is not displayed online.

FAQs

Q: What is a damp-proof membrane used for?

A: A damp-proof membrane forms a barrier beneath a concrete floor to help prevent ground moisture entering the building. It can also be used for groundwork and other applications requiring a hard-wearing waterproof sheet.

Q: What is the difference between DPM and DPC?

A: A DPM is generally a wide sheet installed beneath concrete floors. A damp proof course is a narrower roll installed within walls to stop moisture rising through the masonry.

Q: What thickness of DPM sheet do I need?

A: The required thickness depends on the floor design, site conditions and project specification. Supreme Merchants stocks options including 300mu 1200-gauge and 500mu 2000-gauge DPM sheets.

Q: Which width of damp proof course should I buy?

A: Choose a DPC that matches the width of the masonry and provides the coverage required by the construction detail. Rolls are available in widths from 100mm to 600mm.