Damp Proofing

Damp proofing is the application of materials and treatments to walls and floors to prevent moisture from penetrating the structure. Unlike waterproofing, which is designed to resist continuous water pressure in below-ground or wet conditions, damp proofing addresses moisture ingress from ground contact, capillary action and penetrating damp in above and below-ground structures. The correct damp proofing treatment depends on the cause of the moisture: rising damp in masonry walls requires a chemical damp proof course, while moisture penetration through walls and floors requires a damp proof coating or membrane. The range at Construction Supplies UK includes damp proof injection creams for chemical damp proof course installation, cementitious and bituminous damp proof coatings, and a liquid damp proof membrane, covering the principal damp proofing products used in both remedial and new build applications. Products are available from Wykamol, Sika, Fosroc and Newton Waterproofing.

Damp Proof Injection Cream

Chemical damp proof course injection is the standard remedial treatment for rising damp in masonry walls. Rising damp occurs when moisture travels upward through the capillary pores of masonry from ground level, typically presenting as a tide mark on internal walls, salt deposits and deteriorating plasterwork at low level. Where a physical damp proof course is absent, has failed or has been bridged, a chemical damp proof course is installed by injecting a silicone-based damp proofing cream into the mortar bed joint at regular intervals along the affected wall. The damp proofing cream saturates the mortar and adjacent masonry, curing to form a continuous water-repellent zone that prevents further capillary rise. Damp proof injection creams in the range are silicone-based, ready-to-use formulations suitable for injection into brick, block and stone masonry in both solid and cavity wall construction.

Injection is carried out by drilling holes into the mortar bed joint at approximately 120mm centres and injecting the cream using a standard cartridge gun until the cream begins to emerge from adjacent holes, indicating full saturation of the mortar. The cream is left to cure before replastering.

Damp Proof Coatings

Damp proof coatings are applied to wall and floor surfaces to form a barrier against moisture penetration. They are used in both new build construction and remedial treatment of existing damp problems, and are suitable for application to concrete, masonry and blockwork substrates both internally and on external walls. Cementitious damp proof coatings in the range are mixed with water to produce a slurry that is brushed onto the prepared substrate, forming a rigid barrier against moisture ingress on walls and floors.

Bituminous damp proof coatings provide a flexible, waterproof barrier against moisture on concrete and masonry walls and floors, suitable for both above and below-ground applications. The range also includes a fibre-reinforced epoxy-cement damp proof coating that can be applied either as a trowel-applied mortar for surface repair and smoothing, or with the addition of water as a brush-applied slurry for damp proofing walls and slabs. This product resists both positive and negative water pressure and can also serve as a primer for subsequent liquid waterproofing coatings. It must not be applied to actively weeping surfaces, any active water ingress must be arrested before application.

Liquid Damp Proof Membrane

A liquid damp proof membrane is a brush or roller-applied coating that cures to form a continuous, flexible waterproof layer over the substrate. It is used to damp proof concrete floors before screeding or laying floor finishes, and as a damp proof wall membrane to provide a barrier against moisture penetration on walls prior to plastering or dry lining. The liquid damp proof membrane in the range is a solvent-based bituminous formulation, suitable for use under screeds, timber flooring and other floor finishes as well as on walls where a flexible damp proof barrier is required.

Choosing the Right Damp Proofing Product

The correct damp proofing product depends on the type and location of the moisture problem. For rising damp in masonry walls, a damp proof injection cream is the appropriate treatment. The silicone-based creams in the range are suitable for chemical damp proof course installation in brick, block and stone walls in solid and cavity construction, injected into the mortar bed joint using a standard cartridge gun. For moisture penetration through walls and below-ground surfaces, a damp proof coating provides a surface-applied barrier. Cementitious damp proof coatings are suited to walls and floors where a rigid, brush-applied slurry system is appropriate. Bituminous coatings provide a flexible alternative for concrete and masonry surfaces. Where higher performance is required, or where the coating will also serve as a primer for a subsequent waterproofing system, the fibre-reinforced epoxy-cement option provides resistance to both positive and negative water pressure up to 9.5 bar.

For damp proofing concrete floors before laying floor finishes, a liquid damp proof membrane is the appropriate product, applied by brush or roller to the prepared concrete surface before screeding or the installation of floor finishes.

Why Choose Construction Supplies UK for Damp Proofing Products?

Damp proofing products for every application: From damp proof injection creams for rising damp treatment to cementitious and bituminous damp proof coatings and liquid damp proof membranes, we stock the key damp proofing materials for remedial and new build applications.

Trusted industry brands: Shop Wykamol, Sika, Fosroc and Newton Waterproofing from stock.

Competitive trade prices: Damp proofing products at competitive trade prices with no minimum order value.

Fast UK-wide delivery: Reliable nationwide delivery with free shipping on orders over £300.

Expert support when you need it: Our team can help you choose the right damp proofing product for your project. Contact us at sales@constructionsuppliesuk.co.uk or call 03300 55 32 02.