I have a brick veneer home with a rectangular hole in the wall that currently holds an unneeded window air conditioner. I bought a window I would like to install there. The hole does not have a brick sill - the hole was built specifically for the AC (long before me) so there is no ledge. Lucky for me that means I won't have to cut any bricks to prepare the opening. Would a PVC exterior window sill would be the easiest way to go? Do I have to put a sill at all? I live in a VERY humid, hot area. Do you have any tips or recommendations for my project?

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    I think you will want a sill to keep rain from running down the inside of your brick and causing water damage over time.
    – Ed Beal
    Oct 12, 2016 at 23:16

1 Answer 1


I guess the Water was previously redirected by the AC which was your sill. Therefore I would install a sill to redirect the water away from the house.

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