![]() ![]() Many installers only apply a ¼-inch bead or less. ![]() The most common mistake I see here is not applying enough sealant. Then run a second bead of sealant along the gap between the outside edge of the buck and the concrete. Apply the sealant to the back of the buck in a zigzag pattern, place the buck in the opening, and drive concrete screws through the buck into the concrete. ![]() The first step is to seal the backs and edges of wood bucks at window and door openings using a high-grade ASTM C920 class 25 sealant. | Image: courtesy IBACOS Step 1: Apply Sealant Because of their width, concrete block walls often afford deep recesses for windows, but waterproofing the system against wind-driven rain requires careful attention to detail. And both steps have key details that absolutely must be done right. In short, those recessed areas become water traps for wind-driven rain and consequently require a two-step process that consists of applying sealant and liquid-applied waterproofing. CMU walls are common in Florida and other parts of the Southeast, but the practice of recessing windows and doors into rough openings in concrete block walls creates a waterproofing challenge for home builders. ![]()
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