11/27/2023 0 Comments Sip panels texasWhat are your suggestions for a breathable underlayment? At this point I am considering using GAF Deck Armor.Īnyone who thinks their metal roof problems will be solved by putting asphalt shingles up is dreaming. The more research I have done, the more I see folks recommending furring of the deck on the SIPs. For the one panel that we opened, the SIPs appeared to be in acceptable condition and still should hold fasteners. When walking the roof, I have yet to discover what I would consider soft spots (and I have been over most of this roof myself). We are yet to open up the whole roof and see what we have, but I will say at this point that I think the felt has done it’s job and helped protect the SIPs to the extent that it could. ![]() (There is also 15# or 30# felt under the warm side of the panels (over top of our tongue and groove wood ceilings on the interior) It’s just hard to tell from the photos because of the rust and oxidation stains on the felt. There actually is an underlayment under the metal on this roof – 30# felt. Todd, thank you very much for letting my comment through and for your condolences. ![]() In our case it was the back side of our galvanized roof panels. ![]() I think the reality is that as the home ages and the OSB skins on the panels expand and contract, previously airtight foam joints slightly open up and allow for warm air to escape the system and thus condense on the first cold layer. We are not happy at all because 13 years ago we were told that the SIPS would not require ventilation. Shingles should cost quite a bit less too, which is appealing when considering the extra expense we are incurring for the tear off and new layer of sheathing. As much as we like the look of metal, we are tired of dealing with snow and ice issues on the roof here in Ohio, so we will likely resurface the new roof with asphalt shingles which hold the snow better. All of it will be ventilated at the facia and ridges. Then we will apply a new layer of breathable underlayment, followed by vertical furring strips (probably 2×2 or 2×4 16″ on center), followed by a new layer of sheathing, and then another layer of breathable underlayment. We are going to tear off all of the galvanized metal roofing and felt underlayment. We will be replacing it this summer or fall after only 13 years on our “lifetime” metal roof. We had the same problem with installing standing seam galvanized roof panels over top of our SIPS. Please check this out throughly so you don’t end up replacing a roof only 7 years old like we had to do to head off serious problems down the road. Most sip panel manufacturers dance around this question of venting or not to vent. One homeowners roof was 12 years old and in quite serious shape. Our metal roofer told us we were third homeowners with sip panel roof to contact him with this problem. If you have a sip roof or are putting one on, please research, research, research before applying the shingles directly on top of the sip panels with no venilation. We put in a cold roof system under the metal roof. When they were tearing off the shingles they saw evidence of the start of dry rot on our sip panels. ![]() We bit the bullet and installed a metal roof last year. At home shows we started questioning roofers about our situation. We put the roof right on top of the panels with ice guard underneath. Not long after building we noticed our downspouts filled with granular crystals from the roof and the shingles were curling. We built our timberframe home with sip panels 7 years ago.
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