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Old 01-16-2014, 07:25 AM   #1
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Location: MACON, GA
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Looking for a older roof/ac post

Need to see if anyone remembers the post about installing shims under the roof
AC units to stop ponding water... or a little info if you have done this... water settles around my front AC unit and a very small drip inside, have replaced the seal and tighten the 4 bolts but still will leak when level

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Old 01-16-2014, 04:09 PM   #2
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What kind of roof do you have?
I have shimmed an aluminum roof before. I put wood under the roof skin. You do not put shims on top of the roof material and under the AC gasket.

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Old 01-16-2014, 04:17 PM   #3
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Here's an older post that might be what you're looking for.

AC roof mount problem

A common reason for water intrusion that you describe can be blocked drain holes in the pan preventing run off.

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Old 01-17-2014, 03:58 PM   #4
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I saw an article some time ago about putting a frame/spacer between the roof structure and the rubber membrane to raise and level an air conditioner. Here is a similar repair on a metal roof. Same general idea but 3/4 inch may be a lot for a rubber roof. Under the rubber there could be no sharp edges. Would still need a new gasket when putting the ac back.
Shoring up sagging roof due to air conditioner weight
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