Heavy duty damp proofing membrane with air gap and mesh face. Ideal wall lining following DPC injection. Enables the direct application of wall plaster on damp walls within the drying out period. 3 sizes.
A cost effective polypropylene tanking membrane with 2mm 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
A waterproof rendering additive for use in sand and cement render mixes when renewing wall plaster following insertion of a new damp proof course. sufficient admixture for 150 square metres of render at 12mm thick 25kG
A BBA Approved tanking mix formulated for waterproofing basement and cellar walls. Mixed with 6.5 litres of water and used at the rate of 3kg of mixed slurry per sq/m, there is sufficient slurry to cover up to 12m2 per coat
The process of plastering walls has been used in building construction and renovation for hundreds of years. The method of using backing plaster with a skim coat is today generally only used for property renovation as new build houses typically use plasterboard for dry lining walls.
One of the most common reasons for carrying out plastering work in old houses during renovation is to complete a course of damp proof treatment. Whether one is treating rising damp or waterproofing basement walls the direct bonding of plasterboard on walls prone to dampness should be avoided unless an air-gap membrane is used to create a physical barrier between the wall and the plasterboard.
When plastering after the insertion of a new damp course it is important to use either a renovating plaster mix that has been specially formulated for the purpose or, if using backing render with a skim coat, a waterproofing admixture that permits evaporation of water vapour but inhibits the movement of salts.
Waterproof plastering, used for example to hold back dampness in below ground areas, basements and cellars, is more commonly referred to as tanking. Tanking slurry is generally sandwiched between a dense render coat and top coat of renovating plaster.
Tips for plastering damp proofed walls above ground
Use renovating plaster or two coats of backing plaster with waterproof additive topped with a skim coat or
Use a mesh faced damp proof membrane having an air gap and either plaster or dot and dab plasterboard on top
Tips for plastering basement, cellar or below ground walls
Use tanking slurry sandwiched between a dense render coat and top coat of renovating plaster or
Use a fully sealed cavity drain membrane system and either plaster, dot and dab or dry line on top (drainage may be required).
Plastering requires a great deal of skill to get a pleasing finish. Dry lining with plasterboards require less skill, though the final coat or top coat of plaster, or skim, can still be tricky for DIY enthusiasts