Bond-It Damp Proof Course (DPC) Membrane 100mm X 30 Metre roll - Flexible, Durable, Safe and Clean to Handle Meets BS6515. Embossed to Assist Mortar Adhesion - Cost Effective dpc, Black, DPC100

Product Information

Preformed stepped cavity trays should be provided above the roof surface and linked to the roof upstand or flashing to ensure any water penetrating into the cavity does not enter the enclosed area.

The DPC membrane should be applied to a fresh bed of mortar. Make sure that the area is completely free of anything that may puncture the DPC or prevent it from lying flat. A variation on the workaround illustrated above. On the left-hand side, a pre-cast concrete edging has been used to create the retainer and the paving is significantly higher than the dpc. A dished channel unit has been used at the base to direct any surface water to the gullies. Although a relatively narrow channel is shown here, these 'dry area' solutions can feature much wider channel, often 600mm or more, and so consideration must be given to safe-guarding the edge to prevent accidental falls. Drained channel arrangement A DPC should be provided a minimum 150mm above adjoining surfaces and linked with the DPM in solid floors.

Where are you?

Just solid masonry separated by a vertical DPC. This means that this part of the wall will be colder that the rest of the wall, resulting in condensation forming around this part of the structure – a case of ‘cold bridging’. Judging by the standards of workmanship, it’s quite likely that there is no insulation below the DPC either, meaning the same problems will happen around the skirting too. It’s important to think about cold bridging through any part of the structure but especially where junctions occur. Further information

The DPC also features an embossed finish to make mortar adhesion better. How to install a DPC membraneJewson building materials can make sure you have everything you need to not only install a damp proof course, but to complete the job from start to finish. Damp proofing membrane is sometimes called DPM for short, or DPC membrane as shorthand for 'damp proof course membrane'. A damp course is not the only method of damp proofing for the home. Our range of damp proof products also includes chimney pots, which can help to keep adverse weather from entering the property via the chimney. Use of an insulated cavity closer would have prevented these last 2 problems. For more information about preventing cold bridges, refer to our Registered Construction Details. The Building Regulations require at least 150mm between the dpc and the ground or any paving. This is what is known as 'Best Practice'. However, there are situations where it is just not possible, or practical, to maintain this regulation. On professional work, and new build projects, every possible effort should be made to ensure the 150mm rule is not breached, but, for small, domestic projects, such as a driveway or patio, there are cases where keeping the paving to 150mm below dpc would involve a huge amount of work that cannot be justified. In such cases, the 150mm rule can be 'bent' a little, but with the following provisos...