OK, I thought it would work but it didn’t, so now what to do? Installed
glass block in a small exterior window. Tried to follow all directions. Got
a good mix on the mortar. Tooled joints concave to try for a smooth,
water-tight seal. Looks nice and neat. But they leak anyway. Some water
through hairline cracks as mortar cured. Some (probably) where the block
and mortar join. None is from sitting water–it just sneaks in as it rolls
down the window. What’s the best way to waterproof this now? I’m hesitant
to just spread caulk across the joints w/o first seeking the collective
These bags from Quick Dam arrive compact and swell to form a protective barrier on contact with water.
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