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PostPosted: Sun Jul 22, 2018 12:53 am 
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I fitted a new flat roof to my utility about 4 years ago with osb boards and a one piece firestone EPDM roof covering this included a pipe boot around a soil pipe vent. Lap sealant was applied around the boot but now it appears the pipe boot seal has failed because the osb board feels soft under it.
I plan to replace the soil pipe vent with a external air admittance valve so nothing has to break through the roof. The damaged osb board has to be replaced plus it has a hole in from the vent. I glued the rubber down fully to the boards.
What is the best way to patch the rubber? Can I cut and peal back the rubber replace the damged board, glue the rubber back down then fill the hole where it was cut around the vent with a new piece of rubber then cover the area with a large cover patch of new rubber? But this would leave a step where the new rubber sits on top of the old. Or instead replace the board etc then just recover the whole roof again leaving the original on and have rubber on rubber so there are no patches therefore no steps and a joint free covering. Or even (this may be a bit over the top) replace the damaged board then cover the whole roof with new insulated backed osb board then a new rubber so again a joint free covering plus extra insulation. If I did go down this route could the insulated board be glued down?
Thanks inadvance for any advice.

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PostPosted: Mon Jul 23, 2018 11:28 pm 
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Why go through the trouble and expense of covering over a perfectly good roof. It's only 4 years old, it's got another 20 before you start considering that. Just buy a patch kit, Firestone provide separate and distinct guidelines for exactly that.

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