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How low can you go with basic three-tab shingles? And with roll roofing? I have a friend with a covered-enclosed patio, and they are getting water dripping from the ceiling. I looked at the roof, and it looks like there is some flashing missing (never was there) where the patio roof meets the sidewall of the second floor. A couple of areas of the fascia board are badly rotted. The shingles are in good shape, and they all lay flat. Slope is about 2:12 for the patio.
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We went 2 1/2" pitch once, but cut the exposure to 4" with 3-tabs.
You can go a lot flatter with roll roofing.
*Check the shingle manufacturer's instructions for whatever brand you have available. I don't like 'em below 4/12 personally.
*I wouldn't dream of laying at less than 3/12 in temperate regions, 4/12 in snow areas.But if the roofer didn't even use flashing, he was doing more than dreaming!
*I was stuck using shingles on a roof I could only raise to a 2.5/12. Went with dimentional, ice shielded the entire deck, and flashed the heck outta everything......even the skylight's I wouldn't warrenty! The shingle company gave me the go ahead if ice guard was used...and the building inspector said ok....based on the shingle company....but wanted increased venting....due to all the ice shield. We all thought the skylights would go first.....but they were over a deck...not the living space. Several years later......and no leaks.....even thru our snow/winters. Not even the skylights.....which were just the cheap bubbles. The shingle company and inspector gave the go ahead for 2/12.....but I squeezed all the slope out of it I could. Jeff