What is a damp proof course?
A damp-proof course is a barrier inserted into the structure of a building to prevent moisture from travelling upwards through walls or floors. It serves as a waterproof layer that is typically placed at least 150 mm above ground level in walls, although the exact height can vary depending on building regulations and the property’s susceptibility to damp. The aim is to stop what’s known as “rising damp,” which occurs when groundwater moves up through a wall or floor by capillary action.
What is a damp-proof course made of?
Damp-proof courses can be made from a variety of materials, including bitumen, slate, plastic, or specially engineered bricks that repel water. In modern buildings, a damp-proof course is usually a synthetic, waterproof material that is laid down before the bricks or blocks are put in place. In older properties, it could be a layer of slate or bitumen felt.
What is a damp-proof course is missing or damaged?
If a damp-proof course is absent, damaged, or improperly installed, the property is at risk for issues related to rising damp. This can result in discoloured walls, peeling paint or wallpaper, and more serious structural problems if not addressed. Treatment for failed damp-proof course often involves inserting a new damp-proof course and can be both invasive and costly, which is why it’s crucial to ensure that the damp-proof course is in good condition, especially when purchasing a property.
How is a damaged damp-proof course fixed?
It’s worth noting that damp-proof courses are just one aspect of a comprehensive damp-proofing strategy, which may also include damp-proof membranes for floors and adequate ventilation to tackle condensation issues. Always consult with qualified professionals for an accurate assessment of any damp issues and the most effective treatment methods
Key takeaways
- A damp-proof course is a barrier designed to prevent moisture from rising through the walls or floors of a building.
- The material of a damp-proof course can vary, including bitumen, slate, plastic, or specially engineered bricks.
- If a damp-proof course is missing or damaged, the property is at risk for issues related to rising damp, such as discoloured walls and structural problems.
- Fixing a damaged damp-proof course can be invasive and costly.
- Damp-proof courses are part of a comprehensive damp-proofing strategy, which may also include damp-proof membranes for floors and adequate ventilation.