How to Attach Wood Drip Caps
- 1). Measure the length of the head casing on the window with a tape measure. The head casing is the top trim board on the window.
- 2). Lay the drip cap on a work surface. Measure and mark the drip cap to the measurement in step one. Place the drip cap flat on a miter saw with the top side facing up and the back edge against the fence. Slide it over so that the edge of the pencil mark is at the edge of the saw blade. Lower the blade and move the saw through the wood in a steady motion to complete the cut.
- 3). Brush a coat of exterior primer on all sides of the cut drip cap. Allow the primer to dry for at least four hours.
- 4). Pry up the siding board just above the head casing using a flat bar. With utility shears, cut a strip of self-adhering waterproofing membrane to the length of the head casing. Apply the strip to the exterior of the home above the head casing.
- 5). Cut off the tip of the caulk tube with the built-in cutter on the caulk gun and insert it tip first into the gun. Apply a generous bead of caulk along the top back edge of the head casing.
- 6). Place the drip cap on top of the head casing and press it back against the waterproofing membrane so it rests against the membrane and head casing. Caulk along the back and side edges of the drip cap.
- 7). Replace the siding board above the head casing. Hammer the nails back into place.
- 8). Brush on two coats of exterior paint. Allow at least four hours between coats.
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