Waterproofing for Refurbishment Works

Waterproof refurbishment plasters should be salt, frost and damp resistant. They are hydrophobic aerated plasters with high water vapor diffusion, allowing damp substrates to dry. They should exhibit low crack susceptibility. They should prevent bubbling of paint, spalling of plasters and salt efflorescence. Heat, frost and high winds must be avoided during application and up to 24 hours thereafter. During this period, the plaster must be kept damp. Refurbishment plasters are normally applied in two layers, the first in a layer thickness of 10-15mm. When the first layer is able to take the load a second layer is applied in a thickness of 10 mm. On very damp substrate and in case of medium to high salt contamination generally two layers are applied. In case the total thickness exceeds 20 mm, 1 day/mm extra is allowed before applying additional coats. Intermediate coats must have a rough textured finish to provide a key to subsequent layers.

Holderchem offers for refurbishments durable plasters suitable for damp and salt contaminated masonry, which are ideal for refurbishment of basements, vaults, and old structures. These yield a dry, efflorescent free surface suitable for use on damp areas in both new and existing structures. They have thermal insulation properties and are effective in reducing or eliminating condensation. They are ideal for use after insertion of a damp proof course. They are ideally suited to plaster refurbishment in historic buildings.