Masonry Magazine February 2007 Page. 46
WATERPROOFING
builds. The membrane is installed to the point of soil grade on the top and down over the footer on the bottom. Penetrations are detailed to ensure water tightness around them. This same bituminous material can be applied in a roll or spray-on coating, and many manufacturers provide products such as this, plus a significant number supply urethane-based materials that act in a similar manner and perform equally.
All of these membranes should be implemented with a "protection board to guard against the rigors of the backfill process. For sheet membranes, it is also typically required to parge the wall, or apply a coat of mortar to the block, to make the surface smooth to easily fasten the sheet. A parging coat would not be required for a liquid membrane applied with a roller or spray. "In residential applications, the use of a membrane is less common," Keene said. "The typical detail for moisture in residential is to use a vapor barrier coating, such as a thin asphalt material"
Several companies, such as Cosella-Dörken, offer a "dimpled sheet" product. Sandin explained, "The membrane's key job- the first principle of failsafe water management is to keep water from ever touching the wall on the way through the soil to the footing drainage systems. Our Delta-MS provides two lines of defense: the first is an impermeable plastic sheet that is waterproof; the second is the dimpled structure that offers a free drainage path. In the event that water passes the first line of defense, it can flow freely down the air gap to the
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40 Masonry
February 2007
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