Masonry Magazine June 2010 Page. 25
the wall, heads and sills, lintels, shelf angles, and the tops of parapet walls. Parapets are of particular importance, as their copings lay horizontally. Parapets finished with coping stones require maintenance, as mortar joints or sealants eventually will degrade in this orientation. As the joints open up, excessive water will be allowed to pass into the wall. Therefore, I always suggest a heavier, metallic flashing in a smooth profile be placed under the coping materials, or used as the coping itself. A 26-gauge stainless or heavy copper weighing 20 ounces per square foot would be an appropriate choice. In this condition, the metal sections should be soldered in lieu of using a mastic, assuring a strong bond between sections.
A drainage wall system requires only one of these components to be missing for it to fail. Opportunities for failure and culprits of aesthetic or structural issues later on include punctured flashing; an improperly set termination bar; an unsealed drip edge, obstructed weeps; or a missed lap joint. The worst part is that usually, by the time we recognize there's an issue, it is too late. Closed walls aren't reopened easily, as the expense is extraordinary. And what's discouraging is that these are simple details, things we've read about or seen in practice for years. But the speed at which we build today can make the most meticulous of masons overlook small pieces of workmanship that have a tremendous impact on the aesthetic appeal and strength of the structure, as well as the health of its occupants. IMAS Jeremy Douglas is VP of sales and marketing for Sandell Construction Solutions and a CSI Certified Construction Products Representative.
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