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Apak · 05-23-2017, 06:50 PM

I have a leaking a/c gasket and have looked at replacement gaskets. My question is, Does anybody make a true 1 piece gasket? All I have seen are 2 or 4 piece gaskets that appear to be bonded/glued together. Also, every a/c gasket replacement video I have seen shows leaks occurring at these seams. I would would think someone would come to the conclusion that it is a flawed design and create a true 1 piece. Any thoughts??

Old Scout · 05-23-2017, 07:09 PM

Thoughts--too hard to do and unnecessary for the purpose. Biggest issue with a single piece gasket would be the need to disconnect all the wiring just to replace the gasket. So buy the gray, closed-cell gasket [not the cheap white ones]; split the gasket at the corner seam to get around the wires; reseal corner and add a bit of sealant to the rood surface. I use two gaskets stacked to accommodate drain cups/lines, outside wires, etc. Also use rubber blocking on parameter of roof unit to evenly support unit and not crush gasket. Tighten hold-down bolts slightly--like 20-30 INCH lbs.

BFlinn181 · 05-23-2017, 07:21 PM

I suppose if you could find the proper density foam gasket material in a 16" square sheet, you could cut your own. Otherwise, I'd use one from one of the many suppliers that make them available. Often at the first sign of a leak, a slight tightening of the 4 large hold-down screws stops the leak.

Apak · 05-23-2017, 08:22 PM

What is the best option for rebonding the gaskets / sealing gasket to roof? Have heard great things about urethane sealant but would think butyl would be best option for sealant. As for reconnecting the gasket.....I have no idea.

BFlinn181 · 05-23-2017, 09:24 PM

As far as I know, the new gasket usually comes with a double-sided tape to hold it in place on the roof. The 4 bolts that hold the A/C unit on the roof compresses the gasket. No need for extra adhesive or sealing. Clean the edges where the gasket is taped with Goo Gone, acetone, or other adhesive cleaner. A new gasket is usually under $30, even just $10 or so if you go cheap.

Old Scout · 05-24-2017, 05:35 AM

Don't go cheap--go gray gasket [close-cell foam]--around $30. Don't recall any pre-applied adhesive--most folks don't recommend it as its harder to clean/replace next time. Frankly, replacing once every 10-15 years is no biggie and you will want to use a new gasket anyway. Not sure what brand or type to use--think a thin application of typical door/window caulk will do.