A damp proof course forms a horizontal barrier within masonry that stops moisture rising from the ground into walls by capillary action. It is typically installed near ground level or at junctions where damp protection is required.
Damp Proof Course Materials Explained for Wall and Floor Construction
Damp proof course (DPC) products are designed to prevent moisture rising through masonry and structural elements, helping to protect walls, floors, and internal finishes from long term damp issues. Typically supplied in flexible rolls or pre-formed strips, DPC materials are installed within mortar joints to form a continuous moisture barrier at low level in walls, around openings, or beneath structural components. Common applications include new wall construction, extensions, and repair work where existing protection has failed, often working alongside other solutions found within Damp Proof Membranes to create a complete moisture control system.
Most DPC products are manufactured from polyethylene or similar water resistant materials, offering durability and resistance to rot or chemical breakdown within mortar. They are available in a range of widths to suit different wall thicknesses and cavity constructions, ensuring compatibility with standard masonry sizes used with Bricks & Blocks. Installation typically involves bedding the course evenly into fresh mortar to maintain continuity across the wall, with overlaps carefully sealed using products from Sealants & Adhesives to prevent gaps where moisture could track through.
When installed correctly, damp proof courses help maintain structural integrity by reducing condensation risks, mould growth, and deterioration of finishes. They are commonly used alongside thermal layers from Insulation ranges to manage both moisture and heat loss within modern building envelopes, while preparation work often includes levelling surfaces with materials from Sand, Cement & Aggregates to ensure an even, uninterrupted barrier. Flexible handling, straightforward cutting on site, and compliance with recognised building practices make DPC products suitable for both new construction and remedial damp protection projects.
Damp Proof Course FAQ's
Yes, remedial systems can be installed by cutting into mortar joints or using chemical injection methods, although physical DPC installation is more common during new construction or major refurbishment.
The width should match or slightly exceed the wall thickness so the barrier fully covers the masonry. Choosing the correct size helps prevent moisture bypassing the course.
Yes, it should link with floor damp proof membranes to create a continuous seal between walls and floors, preventing moisture from tracking through junctions.
Yes, precast kerbs are frequently used to retain paving or gravel edges. They are designed to handle vehicle loads when installed on a suitable concrete foundation.