Twistfix

Damp Proof Membrane

Barriers that Keep Moisture Out

A damp-proof membrane serves to keep the walls and floors of a building dry. If the DPM is damaged or absent, the provision of special retrofit membranes can rescue the situation and protect the internal surfaces of a home from the effects of damp.

Damp Proofing Membranes for Walls.

Suppose your home has damp walls, and condensation is not the cause. In that case, the prospective issue may be one of groundwater ascending from the foundation level or driving rain soaking through a wall that is vulnerable to harsh weather conditions. A retrofit damp-proof membrane offers part of a remedial package that mitigates penetrating and rising damp problems.

In the case of rising damp, water containing soluble salts rises from the ground at foundation level, drawing undesirable levels of moisture into a house. The conventional approach to counteract the wetness is to install a new chemical DPC.  An essential part of damp-proofing a wall is to renew its salt contaminated plaster. New plastering should not take place within 14 days of a new DPC instal­la­tion.­

Even after this delay, a primary function of the replacement plaster is to block residual moisture and salts in the brickwork from migrating to new decorative surfaces. Thus the new plastering inhibits evaporation of water and prolongs the drying process.

Fortunately, fixing a retrofit damp-proof membrane to the wall overcomes these drawbacks.

‘Baseline 3 Mesh’ is a cavity-drain membrane having a shape resembling a shallow egg-tray. One side of the high-density polyethene barrier includes 3mm-high studs and the other side a polyp­ro­pylene mesh-face.­  The mesh facilitates the direct application wall-plaster or plaster­board.­

Benefi­ci­ally, it is possible to attach the low-profile moisture barriers to the wall immediately after removing contaminated wall-plaster and injecting a new damp-course. Once the membrane is in place, you can instantly apply a plastering coat directly onto the mesh-face, or fix plasterboard to it.  The expedited surface-finishes enables timely redeco­ration, whilst residual moisture can dry in the continuous air gap created by the membrane-studs.

Twistfix Damp Proof Membranes:

  • Isolate plastered and decorated finishes from damp walls and salt contaminated masonry.
  • Robust, durable with a life expectancy greater than 50 years
  • Quick and easy to fit
  • Have a mesh face that provides a key for plasterboard adhesive or cement render.
  • Facilitate early plastering following DPC treatment
  • Available in various roll sizes and as part of damp control kit
  • BBA Certified

Damp Proof Membranes for Existing Concrete Floors.

Suppose your building has concrete floors, and you experience damp patches, wetness beneath floor coverings, or warping wooden laminates. In that case, the likelihood is that your concrete slab has a missing, torn or defective moisture barrier.

Concrete is a porous material, and unprotected floor slabs are predisposed to dampness from the ground beneath. When faced with damp in concrete floors, one possibility of rectifying the issue is to break up the floor, install a new polythene damp proof membrane and replace the concrete slab. However, less disruptive options are available at a reduced cost.

Our standard ‘Baseline 3’ is a high-density polyethene (HDPE) barrier incor­porating integral 3mm stand-off studs at 20mm centres. This robust and durable membrane makes it ideal for isolating damp or contaminated floor slabs. The damp proof membrane sits on the concrete and can support a screed or insulated floating floor.

Liquid Damp Proof Membranes

Twistfix offers two types of liquid-damp-proof membrane.­  The first is SBR Latex-based; it is painted on to masonry or concrete surfaces that will be subsequently protected, for example by a render-coat, flooring screed or tiles.

The paint-on DPM is robust yet highly flexible; it presents a seamless damp-proof layer.

For water­pro­ofing directly on top of existing concrete floors, Twistfix offers a two-component water-based epoxy floor coating system, comprising a primer and a topcoat.­  The direct application of epoxy floor coatings on to damp floors alleviates the need to remove the existing screed, which is messy, laborious and costly.­  The primer soaks into the concrete, blocking its pores and improving its adhesive charac­te­ristics.­  The finish coat delivers a high-quality surface that is wear-resistant and crucially handles constant low levels of moisture in concrete floors.­

The epoxy liquid damp-proof membrane is ideal for use in a variety of domestic, commercial and industrial envi­ron­ments.

For help and advice about damp proof membranes for supers­truc­ture appli­cations, call our office and speak to one of our technical sales team.  We will advise you on the correct products and methods you need to protect your home and keep it safe and dry.  For advice about water­pro­ofing membranes for sub-structure appli­cations, please look at our Basement Water­pro­ofing pages.

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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
£154.80
Price incl. VAT
£136.08
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
£110.16
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
Price incl. VAT
£46.20
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
Slimline 3 Floor Membrane

Slimline 3 Floor Membrane

A low profile 3mm cavity drain waterproof membrane for sealing damp concrete floors without extensive surface preparation. Size: 2 x 20m
RRP
£271.20
Price incl. VAT
£174.31
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