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Old 04-08-2013, 10:48 AM   #1
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Flat Roof (my porch) is leaking in the corner


It would appear that the water runs down the slope of the shingle roof and is irritating the corner of the flat roof which is over my porch. You can see where the white gravel of the flat roof has worn away in the corner. Can someone please advise me on the best way to go about fixing this leak? Is there some kind of miniature gutter system that I can install to catch water as it rolls off the shingle roof and direct it away from the flat roof? Thank You.




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Old 04-08-2013, 12:00 PM   #2
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Flat Roof (my porch) is leaking in the corner


Just 3-course it...along with that vertical lap next to it.

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Old 04-18-2013, 11:03 AM   #3
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Flat Roof (my porch) is leaking in the corner


What do you recommend 3 coursing it with? Henry 209 and fabric?
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Old 04-18-2013, 12:23 PM   #4
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Flat Roof (my porch) is leaking in the corner


That would work. You are going to get more life out of the modifieds like 209 than the cheaper asphalts.

When done, either embedding granules into it or aluminum coating will help to get a little more life out of it. The sun is asphalts worst enemy. Well, that and crappy roofers.

Oh, and use cotton fabric if you can, not fiberglass. Fiberglass is fine on long, flat stretches but does not conform as easily as cotton for your situation.
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Old 04-22-2013, 04:41 AM   #5
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Flat Roof (my porch) is leaking in the corner


I don't see granules on Home Depot or Lowes websites. Any tips? Thanks.
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Old 04-22-2013, 09:08 AM   #6
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Flat Roof (my porch) is leaking in the corner


Look at the valley above. It looks like it is closed cut, then it transitions to a weave that is bucking water. The low slope roof is bridged at the angle change, there is no cant strip, and there is no separate flashing countering the field sheet, you therefore have one ply of bridged membrane where you should have two plies nested.

You should get a real roofer in to correct the valley and the low slope roof, or read up and do it yourself. Dope and fabric might work in the meantime, but your leak may be coming from the valley above.

Try water testing with a hose from the bottom up.
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Old 04-22-2013, 09:27 AM   #7
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Flat Roof (my porch) is leaking in the corner


Quote:
Originally Posted by SpaceCoast View Post
I don't see granules on Home Depot or Lowes websites. Any tips? Thanks.
No they won't. Either sweep some up if you can or just buy a gallon of non-fibered aluminum coat and coat all non-granulated areas.

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