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"William" wrote in message
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I recently bought and installed two sliding glass patio doors for my
beach cottage. I bought them at Home Depot, the plain-jane, inexpensive
ones. They are on the front of the building. Whenever there is a
moderate to heavy rain, the doors leak!! The threshold will fill with
water.

Re-read the installation instructions. Did you block or not allow for the
drainage? Did you install the backwards?

Even cheap doors won't leak when new and installed properly.
Ed