Aluminum Window Channel Sizing: Why a Few Millimeters Decide the Fit
The Fit Is a Stack-Up, Not a Label Most bad window installs start with a simple assumption: if the glass says 10 mm, the channel must be 10 mm. That assumption is how a clean-looking order turns into a site problem. A true fit is never just the nominal glass size. It is the combined result of actual glass thickness, coating buildup, gasket compression, thermal movement, and the amount of edge capture the frame can provide. ...