Aluminum Frame Drilling: The Leak Risk Most DIYers Miss
Aluminum Frame Drilling Is Really a Water-Management Problem The biggest mistake people make with aluminum frame drilling is treating it as a metalworking task only. They focus on the drill bit, the pilot hole, and whether the screw grabs. Those details matter, but they are not the whole job. An aluminum window frame is not a solid metal border around glass. It is a thin-walled, hollow, powder-coated or anodized drainage system. Its job is to shed rain, equalize pressure, manage condensation, and keep water away from the wall cavity. A drilled hole interrupts that system. ...