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Old 04-10-2011, 10:16 AM   #16
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Questions on proper roofing installation


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That flashing looks like ass.

I was gonna say something worse. I see a lot of this locally. Good shingler - bad flasher.
I agree. Although I don't see anything that would really be considered absolutely wrong. My opinion or someone else's may differ, but it would still pass code.

I'm not sure on this situation, but usually this is where the cheaper bid maybe got the job.

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Old 04-12-2011, 01:54 AM   #17
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Called roofer last night and he offered to silicone the nailheads and the 3/4" gap in the step flashings

Manufacturer docs say to use ASTM.... Roofing cement on railheads. But since roof and flashings are brown he says brown silicone is the way to go.

I'm thinking the asphalt based cement will bond better.

Thoughts?

I also read somewhere about pressing some excess roof granules into the cement. To match the roof color. Thoughts on that?
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Old 04-12-2011, 02:11 AM   #18
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Questions on proper roofing installation


At this point it's all about aesthetics and with your low pitch no one except you is going to know it's there. Silicone and asphalt don't mix well yet I see a lot of roofers use GeoCel and the like on asphalt roofs which they shouldn't do. It is best to use an asphalt or urethane based mastic to cover the nailheads.
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Old 04-12-2011, 02:18 AM   #19
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I guess I'll have them use asphalt on the shingles and silicone on the flashings?
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Old 04-12-2011, 06:51 AM   #20
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Questions on proper roofing installation


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At this point it's all about aesthetics and with your low pitch no one except you is going to know it's there. Silicone and asphalt don't mix well yet I see a lot of roofers use GeoCel and the like on asphalt roofs which they shouldn't do. It is best to use an asphalt or urethane based mastic to cover the nailheads.
Geocell 2300 (Purple tube) is not silicone based (it's a tripolymer - whatever that is) and is very compatible with asphalt based roofing products. The only roofing limitations listed are polystyrene and acrylic glazing. But I agree that silicone caulks have no place on roofs.
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Old 04-12-2011, 08:59 AM   #21
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Personally I prefer NP1 for our caulking needs but there are many good products out there.
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Old 04-12-2011, 09:08 AM   #22
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Personally I prefer NP1 for our caulking needs but there are many good products out there.
I'd never use NP1. A snow load will cause it to collapse.........

Just kidding for anyone else reading.........
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Old 04-12-2011, 09:25 AM   #23
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