Measurement & Installation Guides
Two numbers decide almost every seal purchase: glass thickness and bottom gap. These guides show how to get both right, replace the seal, and troubleshoot when a new seal still leaks.
How to Measure Shower Door Glass Thickness (Without Removing the Door)
Open the door and measure the bare edge of the glass — that edge's width is the thickness. A caliper gives the answer in seconds: 6.35 mm = 1/4 in, 7.9 mm = 5/16 in, 9.5 mm = 3/8 in, 12.7 mm = 1/2 in. With only a tape measure, view the edge dead-on, or use th…
How to Measure the Gap Under a Shower Door (and Pick the Wipe Height)
Close and latch the door, then measure from the bare glass bottom edge straight down to the threshold — at the hinge end AND the handle end. Remove or push aside the old worn sweep first. Keep the larger of the two readings and buy a sweep whose wipe is 1/8 t…
How to Replace a Shower Door Bottom Sweep (15-Minute DIY)
Replacing a bottom sweep is a 15-minute job: pull the old sweep off the glass, clean the edge with rubbing alcohol, cut the new sweep to the door width minus 1/16 inch with a fine-tooth hacksaw, press it on starting at one end (a trace of soapy water helps), …
Shower Door Glass Thickness Chart: 1/4 to 1/2 Inch (6–12 mm) Explained
US shower doors use five glass thicknesses: 3/16 in (4.8 mm) on framed sliders, 1/4 in (6.35 mm) on framed and light frameless panels, 5/16 in (8 mm) on semi-frameless doors, 3/8 in (9.5 mm) — the frameless standard, and 1/2 in (12.7 mm) on heavy premium door…
Shower Door Still Leaks After a New Seal? Run This Diagnostic
A new seal that still leaks almost always means the water is taking a path the new part never covered: runoff off the bottom corner (needs a drip rail, not a taller wipe), a sagged door sealing one end only, spray aimed straight at the door line, a curb slopi…
Shower Door Seal Buying Checklist: 9 Things to Confirm Before Ordering
Nine confirmations prevent virtually every wrong seal order: measured glass thickness, gap at both ends with the door closed, the actual water path, frameless vs framed attachment, wipe height = gap + 1/8–1/4 in, enough length to trim, correct angle for magne…