Brunopel IWP
Brunopel IWP is an additive based on an alkaline soap of mixed fatty acids, designed for use in sand/cement mixes following the insertion of a chemical dpc. It is common in a wall suffering from the riding damp for salts carried in the water to concentrate in the wall. As the wall dries out following insertion of a damp-proof course these salts may be deposited on or near the surface and can give rise to efflorescence.
First Coat
- Mix 3 parts sand to 1 part cement.
- Mix gauging water with Brunopel IWP at 30-1 ratio as specified.
- Add minimum amount of gauging water to dry mix to ensure a dense coat. An approximation of not more than 8 litres per 50 kilos of dry mix should be used, as a guide.
- Render the surface to give an overall thickness of between 10-15mm ensuring that the mix is compacted into the joints. Scratch to form a key when the cement obtains its first set. Do not overtrowel.
Second Coat
This mix is as for the first coat applied to give an overall thickness for two coats of about 25mm. Apply this coat before the first coat has finally set in order to obtain satisfactory adhesion between the rendering coats. Scratch the surface to form a key. Do not overtrowel.
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