Waterproofing – Exterior Above Grade
This can be a big problem if the only thing between you and the weather is a concrete or masonry wall. Wind driven rain can quite efficiently find all the small voids or cracks in a wall and manage to get inside your building. A crack as small as 1/1000th of an inch can permit a full hydrostatic flow of water through a buildings wall. Not only can this be annoying to tenants, it can also cause significant structural damage due to freeze thaw cycling. Most coatings also give excellent resistance to fungus and mold growth.
There are two main types of systems available for reducing water infiltration into concrete.
1) High build elastomeric coatings are systems typically are made with acrylic or silicone resins to form a breathable membrane on the surface of the concrete or brick. Elastomeric characteristics allow for movement in the substrate without failure of the membrane. Elongations of up to 600% are common in today\’s materials.
2) Penetrating type water repellants are systems are very low viscosity materials that are designed to penetrate into a substrate and block off the capillary motion of water through the surface. They are available in clear or pigmented versions. Pigmented versions offer excellent colour retention and long term protection in the same application.
With 55 standard colors, plus a custom color capability, Dow Corning AllGuard Silicone Elastomeric Coating gives you outstanding aesthetic value with solid weatherproofing performance. AllGuard Coating is one-part, water-based, 100 percent silicone elastomers that seals out water on above-grade exterior walls. It requires no primer on most substrates and cures to form a flexible membrane that can handle the normal movements of seasonal thermal expansion-contraction, even on EIFS panels. Penta has buildings coated over 10 years ago with Allguard that still look great and are functioning as designed.