Which material is best for damp proof course?
Materials widely used for damp proofing include:
- Flexible materials like butyl rubber, hot bitumen (asphalt), plastic sheets, bituminous felts, sheets of lead, copper, etc.
- Semi-rigid materials like mastic asphalt.
Can you inject DPC from inside?
In short, yes you can inject from the inside. In fact we normally inject from the inside as when the skirtings put back the injection holes are not visible.
How long does an injection DPC last?
Typically, a physical damp proof course lasts for 20-25 years and can fail due to it not being fitted properly or deterioration.
What is the difference between DPM and DPC?
DPC stands for damp proof course whilst DPM stands for damp proof membrane. A DPC is a material placed between courses of brickwork to stop the rise of water up the walls. The types of products used can include polythene materials, pitch polymer combinations or even materials such as slate.
Is damp covered by house insurance?
The worse a damp situation gets, the more it’s likely to cost to repair any damage. Most standard buildings and contents home insurance policies do not cover damage caused by damp and condensation. A damp-proof course can run into thousands of pounds if the whole house needs treating.
Can you put DPM on top of concrete?
DPM’s can be applied to either a suitable blinding layer under the slab or internally to the top of the slab. Consideration should be given to applying the DPM to the top of the slab, as the installation and moisture sensitive internal finishes are then protected from any residual moisture in the concrete.
How thick should damp proof course?
300 micrometres
The use of damp proof membrane in construction is regulated by British Standards, which state that the sheet should be at least 1200 gauge (or 300 micrometres). Using a thinner sheet could mean your building doesn’t comply with regulations, and it can be a costly fix, so 1200 is always recommended.
What height is DPC?
Ensure the dpc is a minimum 150mm above external ground level.
How long does damp course last?
20-25 years
Typically, a physical damp proof course lasts for 20-25 years and can fail due to it not being fitted properly or deterioration. If a damp proofing course has failed then this could potentially lead to rising damp. Rising damp is the movement of moisture through the walls and floors by capillary action.
How do you damp proof an old concrete floor?
When faced with damp in concrete floors, there are two options available:
- Dig up the old concrete floor, install a new damp proof membrane and lap up edges before replacing the concrete slab.
- Fully isolate the dampness in the floor using a surface Damp Proof Membrane (DPM)