Why Dryshield is Required
When rising damp occurs, the ground water that rises up the wall will often contain salts. Where the ground water evaporates, at the maximum height of the rising damp, it can deposit these salts in crystallised form. The salts are either deposited within the plaster or on the surface of the wall itself, appearing as efflorescence.
The deposited salts are often hygroscopic, meaning they draw moisture from the air. This means that the contaminated areas of the plaster will appear to be damp whereas non-contaminated areas will appear dry, despite the fact that the source of the moisture has been treated and stopped.
What Dryshield Does
Dryshield makes the surface it is applied to hydrophobic and weakens the crystallisation strength of the salts within, or on, the masonry surface. The surface is left breathable, so water vapour can still escape the wall, allowing it to dry out, it also prevents further salt and contaminate build up on the surface and prevents the plasterboard from being dislodged.
How Dryshield is Applied
Dryshield Cream is applied by brush or roller and only needs a single coat. It is applied after any damp/contaminated plaster has been hacked off and the wall has been properly treated using DRYZONE Damp proofing cream.
The layer of applied Dryshield should be left to penetrate into the wall surface for at least 30 minutes, before any plasterboard or DRYGRIP Adhesive is applied. The Drygrip and plasterboard must, however, be applied within 24 hours of the Dryshield application.
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