Twistfix

Damp Proofing

Damp proofing is a means to stop moisture from an external source from being transmitted through walls and into the inside of our homes.

If a house has a damp problem then it is vital to establish the precise cause before establishing the appropriate remedial treatment.

The most common causes of excess dampness in buildings are:

  • Condensation - Sorbent moisture from condensed water vapour that is deposited when humid air makes contact with a cooler surface.
  • Penetrating damp - Capillary moisture soaking through a porous wall as it is absorbed from an external source
  • Rising damp - Capillary moisture soaking upwards into a porous wall as it is absorbed from a ground source.

It is imperative to establish the precise cause of the moisture and to remove its source or to provide a water repellent layer to prevent humidity from being transmitted into the home.

  • Condensation occurs when air moisture content is too high in relation to temperature. Consequently condensation can be avoided by correcting the balance between humidity generation and air or surface tempe­ratures.
  • Penetrating damp can avoided by regular building maintenance such as repairing leaking gutters, filling cracks and repointing etc.
  • Rising damp can be alleviated by removing soils or cavity blockages that breach the damp proofing course. Where a DPC is missing or is defective then remedial damp treatment can be used to combat capillarity.

A damp proofing course (DPC) is a waterproof layer that is installed 150mm above ground level during the construc­tion to prevent ground water from the foundations into the home.

Brick stone and mortar building products are each porous to various degrees. Without an effective DPC some water may be absorbed into porous through the process of capillarity. This capillary action is often referred to as rising damp and can be detrimental to your home. The amount of water absorption that can affect a wall having no protection is determined by ground moisture levels and the balance between capillary forces, gravity and evaporation. The main controlling factors are the rate of suction of the water into the wall and the ease at which dampness can evaporate from it.

Modern buildings with cement mortars have lower water-absorption rates than older buildings with lime mortars. It therefore follows that damp control treatment is more often required in older properties.

Chemical Damp Proofing

A very common method for treating rising damp in homes with traditional brick walls is the insertion of a Chemical DPC Injection Treatment. A silicone-based proofing cream is injected into a series of holes that are formed along a mortar bed joint. The cream is absorbed into the pores of the masonry and lines them with a silicone coating that limits capillarity and forms a chemical damp proof course. Once the DPC injection treatment is complete and the source of the dampness cut off then the wall will begin to dry through continued surface evaporation. Thin walls will dry quicker than thick walls and drying walls may leave residual salt deposits

DPC injection systems are less effective in coun­te­racting augmenting moisture where mortar joints are not continuous along the length of a wall or through the entire depth of it.  A more effective method of treating rising damp in houses having random stone or rubble filled walls is through Electro-osmosis Damp Proofing. An electric DPC system uses a series of anodes placed in the wall to provide a small positive charge through it in order to repel free water molecules. A cathode that is buried in the ground attracts the positively charged molecules. As electro osmotic forces are substan­ti­ally greater than those of capillarity then free water molecules are forced from the anodes in the wall and down to the cathode in the ground

In addition it is important to damp proof your home against penetration damp that may be entering the building through walls or roofs. Pore-lining façade cream, damp proofing paint and water­pro­ofing membranes all have a role to play in keeping the home free from water penetration.

Correctly selected damp proofing products will succes­sfully stop humidity from penetrating or rising through the walls into the interior of homes. Twistfix help to make the process quick, easy and cost effective.

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Masonry Water Repellent

Masonry Water Repellent

Water repellent surface treatment for wall suffering from penetrating damp. Prevents moisture migrating through masonry walls and brickwork facades. Costs much less than weather resistant render products. 5 Litres
RRP
£41.40
Price incl. VAT
£27.30
Damp Check – Mesh Membrane Kit

Damp Check – Mesh Membrane Kit

Damp Check Kit provides an effective moisture barrier when isolating damp walls from internal finishes. The air gap behind the damp-proof membrane allows walls to breathe and water to drain. 10m Kit
RRP
£140.40
Price incl. VAT
£126.00
Damp Proofing Cream-380 12 PACK

Damp Proofing Cream-380 12 PACK

DPC cream in 380ml cartridges. Without the need of any specialist equipment the DPC cream will provide an effective barrier against rising damp in walls. The twelve cartridges will treat 22.8 lm of double leaf brickwork.
RRP
£212.40
Price incl. VAT
£99.36
Fungicidal Paint Additive

Fungicidal Paint Additive

Fungicidal paint additive for anti-conden­sation paint. Black mould prevention at a fraction of the cost of a specialised fungicidal paint.
RRP
£11.65
Price incl. VAT
£8.10
DPC-Injection - Cream 6 x 1LTR - BBA

DPC-Injection - Cream 6 x 1LTR - BBA

Damp Proofing Cream sold as a 6 x 1 litre pack for the treatment of damp walls. Using a large caulking gun to inject the cream into the wall the cream will provide an effective barrier against rising damp in walls.
RRP
£178.20
Price incl. VAT
£115.20
Damp-Proof Injection Kit 3000 Pro

Damp-Proof Injection Kit 3000 Pro

A DPC injection kit for the professional user. Includes all products needed to provide a chemical damp proof course to walls. Sufficient DPC cream for treatment of up to 75m of double leaf brickwork.
RRP
£419.40
Price incl. VAT
£298.80
Penetrating Damp Treatment

Penetrating Damp Treatment

Water repellent surface treatment for protection against penetrating damp. Prevents water migrating through brick and masonry façade walls. Costs much less than storm-proof render products. 25L
RRP
£147.30
Price incl. VAT
£98.10
Damp Treatment – All Cure Total

Damp Treatment – All Cure Total

A universal damp treatment kit for treating damp walls above ground level. This 3 in 1 damp treatment system will stop rising-damp block penetrating damp and combat conden­sation. The product will cover 10m of wall.
RRP
£299.40
Price incl. VAT
£214.56
DPC Injection Cream-Damp Cure-3PK

DPC Injection Cream-Damp Cure-3PK

Damp Proofing Cream sold as a 3 x 380ml pack for the treatment of rising damp. Using a standard caulking gun to inject the cream into the wall the cream will provide an effective barrier against rising damp in walls.
RRP
£53.10
Price incl. VAT
£32.04
Tanking Membrane 20m

Tanking Membrane 20m

A cost effective high density polyethylene tanking membrane with 3mm studs formed on one face of the product and a mesh welded to the other side. Available at a special trade price in a 1m x 20m or 2m x 20m roll
RRP
£155.40
Price incl. VAT
£102.00
Damp Proofing Cream - 8 x 1LTR - BBA

Damp Proofing Cream - 8 x 1LTR - BBA

A chemical damp proofing injection cream in 8 x 1LTR cartridges Inject into a series of holes along the mortar bed to stop rising damp using a large caulking gun. The 8 cartridges will treat 40m of a 230mm wall.
RRP
£237.60
Price incl. VAT
£146.40
Damp Proofing Cream – 380 DPC

Damp Proofing Cream – 380 DPC

Damp proof cream in 380ml DIY cartridges. Stop damp walls with an advanced chemical damp proof course. No specialist equipment needed. Simple DPC injection treatment using caulking gun to treat up to 1.9m of double leaf brickwork.
RRP
£17.70
Price incl. VAT
£11.88