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Damp Proof Course
A damp proof course (DPC) is a critical part of protecting buildings from rising damp by creating a barrier that stops moisture travelling up through walls from the ground. Rising damp can cause visible damage to plaster, paint, and skirting boards, as well as promote mould and structural decay. Whether you’re building new or tackling an existing moisture issue, our range of damp proofing solutions includes cream, liquid, and injection systems that penetrate masonry and form an effective horizontal barrier against capillary water movement.
Visqueen Zedex Non-Combustible Damp Proof Course
Designed for cavity wall constructions including those with a structural framing system inner leaf and a masonry outer leaf, in residential, commercial and multi-storey buildings. Typical applications include being used as a vertical DPC, or as a site formed surface fixed cavity tray to manage the downward passage of water in cavity wall...
Visqueen Zedex High Bond Damp Proof Course
For masonry applications including residential and commercial up to and including three storey buildings. It can be site formed into a built-in or surface fixed cavity tray to manage the downward passage of water in cavity wall applications. It can also be used on sleeper walls below a ground floor construction e.g. beam and block floor...
Visqueen Zedex CPT High Performance Damp Proof Course
For installation in internal walls to prevent rising damp. The DPC is also suitable for installation in external cavity walls with a masonry outer leaf, including walls with a light gauge steel frame, structural timber frame or masonry inner leaf. The DPC is suitable for residential, commercial and multi storey buildings. BBA certified -...
Visqueen Zedex Housing Grade Damp Proof Course
Designed for residential buildings up to and including 3 storeys high, suitable for installation in internal walls to prevent rising damp. Also for installation in external cavity walls with a masonry outer leaf, including walls with a light gauge steel frame, structural timber frame or masonry inner leaf. BBA certified - third party...
Watco Damp Proof Course Cartridge and Nozzle
Damp proof injection stops rising damp in walls. The advanced formula means that fewer holes need to be drilled in the wall when compared with conventional systems. High penetration formula No high pressure tools required Use on single skin or cavity walls Easy to handle, low hazard cream Coverage rates and specifications further below...
Visqueen Ultimate Gas Damp Proof Course
Suitable for all masonry wall applications including residential, commercial and multi storey buildings. It can be site formed into a built-in or surface fixed cavity tray to manage the downward passage of water in cavity wall applications. Complies with CIRIA C748:2014 - industry standard for volatile organic compounds (VOC) protection...
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Damp Proof Course (DPC) Creams & Liquids for Rising Damp Protection
Installing a damp proof course is one of the most effective ways to control rising damp in walls and prevent future damage to interior finishes and structure. DPC systems create a barrier within the wall that blocks water travelling upward through capillary action. These treatments are essential in older buildings that were constructed without an original DPC, or in properties where the existing damp proofing has failed or deteriorated over time, or may require waterproofing.
Our range includes high-performance DPC creams and liquids that can be injected directly into mortar joints or drilled holes. These products are formulated to migrate through masonry and bond with the pore structure, forming a hydrophobic layer that resists rising moisture. Application methods vary depending on wall thickness and material but are generally clean, non-invasive, and require minimal preparation when compared to traditional mechanical DPC installation.
DPC products are suitable for both solid and cavity walls and can be used alongside internal replastering systems for a complete damp-proofing solution. They are commonly used in ground floor walls, chimney breasts, and any area where salt damage or damp staining is visible. Some systems are water-based and low odour, making them ideal for occupied homes and enclosed spaces where ventilation may be limited. By stopping moisture at its source, damp proof course treatments help to preserve property value, protect interior finishes, and improve comfort. With minimal disruption and long-lasting results, they offer a proven method for restoring walls affected by rising damp and preventing future problems from recurring.
Damp Proof Course FAQs
How can I tell if rising damp is present in my walls?
Common signs of rising damp include tide marks on interior walls, peeling paint, crumbling plaster, salt deposits, and damp smells near the floor level. The damage typically starts at the bottom of walls and progresses upwards, often in a distinct horizontal pattern. A moisture meter can help confirm moisture content in the masonry.
Can I install a damp proof course myself?
Yes, many DPC creams and liquids are designed for DIY use with minimal tools. Cartridge-based products can be applied with a standard skeleton gun. For larger areas or professional application, a DPC injection pump may be preferred. Always follow manufacturer instructions and drill to the recommended height and depth for effective coverage.
Do I need to replaster after installing a DPC?
In most cases, yes. Salts and moisture trapped in old plaster can continue to cause staining and damage even after the wall is dry. It’s recommended to remove damp-affected plaster and replace it with a breathable renovation plaster or salt-resistant system following DPC installation.
How long does a damp proof course last?
A correctly installed chemical DPC can remain effective for decades. Most high-quality systems are designed to last at least 20–30 years, provided they are applied according to instructions and the wall is properly maintained. Avoid covering treated walls with impermeable coatings, which can trap residual moisture.