![]() Membrane Keyboard and Integrated Sealed Solid-State Optical Trackball.Hazardous keyboards are also available with FM Approvals, Class I, Division 2, Groups A-D for all your hazardous areas. Desktop or panel mount designs are available so you can find the industrial keyboard that fit all your industrial needs. Graham Davis drives quality and performance in home building as a senior building performance specialist on the PERFORM Builder Solutions team at IBACOS.Industrial keyboard housed in a NEMA 4X enclosure with membrane keypad and integrated industrial trackball. When installing windows, always use a three-step precast sill, which has an extra dam at the interior side of the sill, offering added protection against wind-driven rain. These homes are at high risk of moisture problems. This is a sign that the block’s pores weren’t fully sealed because the installer was in a hurry and didn’t use a thick enough coat or didn’t work it into the surface. I also frequently see homes where waterproofing applied to the block looks splotchy after it dries. DON'T skimp on the thickness of the waterproofing application: They assume that the jamb is the most likely spot for water intrusion (which it is), but they forget that rain can drive water into any gaps around the window or door (which it most certainly will). How to Manage Moisture in Walls: Tips for Designing and BuildingĪ Few Waterproofing Do's and Don'ts DON'T limit the extent of your waterproofing application:Ī lot of builders simply (and wrongly) apply liquid waterproofing to the sill, then extend it only half way up the opening.A buck coated with waterproofing is less likely to absorb water that can then make its way to (and into) the block. And although the gap around the window gets filled with low-expansion foam, that gap is a weak point for moisture intrusion. The reason for the extent of waterproofing is that recessed windows and doors in block walls don’t have nailing flanges as with framed walls instead, they’re screwed in place through the jamb. However, two full coats are rare some builders use just one and when two are used, the thickness is inconsistent. Some jurisdictions may require about 8 inches past the opening on all sides to allow for the opening and bucks to be fully waterproofed. Block-wall recesses become water traps in wind-driven rains and consequently require a two-step waterproofing process. Apply both coats after installing the buck and extend it to the front edges of the openings. ![]() The best-quality solution is to use two coats of waterproofing membrane. Why do you need this coating? Without it, capillary action will draw rainwater into the pores in the exposed concrete of the recess and that water will eventually get into the home. Block walls are almost always finished with stucco, so the membrane must be approved for use behind stucco to ensure a firm bond. Next, apply a liquid concrete waterproofing membrane over the area. How to: Proper Flashing for Recessed Windows.Avoid Water Intrusion and Leaks: Penetration Flashing Done Right.But it takes it a 3/8-inch-to-1/2-inch-thick bead to create a proper seal over the irregular surface of the blocks. 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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