A properly installed door is not only about smooth operation—it is a system that manages water, air, and movement. In Los Angeles, where sun exposure, occasional heavy rains, and coastal humidity can stress materials, the right installation and sealing technologies help prevent drafts, leaks, and premature damage. Start with preparation: verify the rough opening size, plumb and level the framing, and inspect for rot or cracks. Add a sill pan or build a sloped pan to direct water outward, then apply flashing tape in the correct sequence (bottom first, then sides, then top) to create a shingled drainage path. For exterior doors, integrate the head flashing or drip cap so water cannot sit above the frame. Set the frame using shims at hinge points and lock areas to maintain alignment without warping. Fasten according to manufacturer specs, rechecking reveal and swing. For air sealing, use low-expansion foam designed for doors and windows—too much pressure can bow jambs. In larger gaps, use backer rod before sealant to control depth and improve elasticity. For long-term performance, choose high-quality exterior-grade sealants (silicone or hybrid polymer) and ensure compatibility with painted or anodized surfaces. Seal the exterior perimeter while keeping drainage paths clear; never block weep routes. Finish with interior sealing and trim, then test with a light draft check and a controlled water spray. These methods deliver a cleaner install, better comfort, and reliable weather resistance for Los Angeles homes.
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