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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Damp Proof Cream 380 DPC-6PK

Damp Proof Cream 380 DPC-6PK

Damp Cure DPC cream in 6 x 380ml cartridges. Treat damp walls with advanced chemical damp proof course products. No specialist equipment needed. Simple DPC injection treatment using caulking gun.
RRP
£106.20
Price incl. VAT
£56.88
Damp Proofing Paint

Damp Proofing Paint

General-purpose, quick drying damp proof paint that dries to form a water-proof membrane. An effective penetrating damp treatment for water­pro­ofing wall surfaces. 5L
RRP
£60.30
Price incl. VAT
£46.20
Electro Osmotic Standard Kit

Electro Osmotic Standard Kit

Lectros electro osmotic damp proof system. A scien­ti­fic­ally proven rising damp treatment using osmosis. Ideal damp treatment for thick brickwork and rubble-filled stone walls.
RRP
£482.70
Price incl. VAT
£335.40
Damp Proof Cream - 4 x 1LTR - BBA

Damp Proof Cream - 4 x 1LTR - BBA

Rising damp injection cream in 4 x 1 ltr cartridges. Inject into the mortar bed using a large caulking gun to form a Chemical DPC. The four cartridges will treat 20m of double leaf walls.
RRP
£118.80
Price incl. VAT
£80.40
Masonry Water Repellent Cream

Masonry Water Repellent Cream

Dry Seal masonry water repellent is a high strength silane cream treatment that waterproofs brick and stone facades including walls, bridges and tunnels. 3kg Tub
RRP
£107.70
Price incl. VAT
£86.70
No More Damp EP40 Epoxy Floor Coating System

No More Damp EP40 Epoxy Floor Coating System

No More Damp EP40 floor coating system is a water based two part system consisting of an Epoxy Primer and a Epoxy Finish coat in Grey or Clear. Sold in 5 kg containers.
RRP
£78.60
Price incl. VAT
£52.20
Damp Injection 8000 Box

Damp Injection 8000 Box

Rising damp injection cream in a builders refill pack. A low cost and low waste damp course cream package supplied in a 8 litre refill pack for damp proof contractors. This box treats up to 40m of double leaf wall
RRP
£179.40
Price incl. VAT
£118.80
DIY Damp Proofing Cream – 380 DPC Kit

DIY Damp Proofing Cream – 380 DPC Kit

Easy to use DIY damp proofing kit. Includes everything you need to provide an effective damp proof course in walls. This kit treats up to 30m of single leaf walls or 15m of double leaf brickwork.
RRP
£129.60
Price incl. VAT
£87.00
Thermaldry Anti-Condensation coating

Thermaldry Anti-Conden­sation coating

Thermaldry anti-conden­sation paint inhibits condensation by reflecting thermal energy away from the walls protecting them from damp and moisture. Applied in two coats with a drying time of 2-4 hours between the application of each coat.
RRP
£115.94
Price incl. VAT
£69.60
Damp Proof Cream - Dampcure 1000 Kit

Damp Proof Cream - Dampcure 1000 Kit

Damp proof cream kit for Builders. This 8Litre DPC injection pack contains the products needed to provide a chemical DPC to stop rising damp in walls. This kit treats up to40m of double leaf / cavity wall
RRP
£255.00
Price incl. VAT
£177.00
DPC Injection Cream - Damp Cure 6000 Kit

DPC Injection Cream - Damp Cure 6000 Kit

Damp proof treatment in a low cost and easy to use DPC injection kit. Includes sufficient Damp-Cure cream to damp proof up to 60m of 110mm single leaf wall or30m DPC for 225mm double leaf wall.
RRP
£189.00
Price incl. VAT
£130.80
DPC Cream 24L Kit

DPC Cream 24L Kit

DPC kit for Builders. This 24 Litre DPC injection pack contains the products needed to provide a chemical DPC to stop rising damp in walls. This kit treats up to 120m of double leaf / cavity wall
RRP
£536.40
Price incl. VAT
£380.51