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How to stick edges of a low-slope roll roof down on fascia?

How to stick edges of a low-slope roll roof down on fascia?


  #1  
Old 06-12-15, 06:51 AM
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How to stick edges of a low-slope roll roof down on fascia?

I just finished redoing my low-slope roof with the GAF Liberty system. It came out decently for me not having any roofing experience, but has one main problem that I can see. The edges of the cap sheet (and the base sheet beneath it) aren't sticking to the fascia on the edges of the roof. The same thing is happening in the middle of the roof where the roof vertically drops down between the higher and lower sections of the roof.

I've attached two pictures: Name:  IMG_20150611_155436.jpg
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Size:  45.1 KBName:  IMG_20150611_1552002.jpg
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As I said, in the first one the overlap on the vertical section keeps popping up (lol please ignore the not-very-straight overlap line I need to clean up), and in the second one, the cap sheet doesn't stick to the fascia.

In the second one I'm thinking about using a couple nails to hold it down, because it's over the side of the house. But I don't want to use nails in the middle of the roof obviously.

Right now I've tried using flashing cement to hold it down but it hasn't stuck.

Any suggestions?

Thanks
 
  #2  
Old 06-12-15, 10:22 AM
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I recently did a flat roof project with metal flashing all around the edge. I was instructed to spray asphalt primer on the flashing and let it dry before attempting to stick the membrane to it. Asphalt primer is available at local roofing supply stores, or where ever you purchased your roofing material. They also said it needs to be stuck to plywood, not OSB as the waxes in OSB would affect the bond.
 
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Old 06-12-15, 10:46 AM
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Thanks for the reply. I did use asphalt primer on all of the metal flashing as well as the plywood (all of which was new) underneath. It stuck very well to the plywood and on the flat sections, but where ever it had to make a hard turn, it doesn't crease enough to keep it in place.

As I said I used sbs flashing cement on the "vertical overlaps" in the first picture to help it stick to the granual-covered cap sheets underneath.

I wondering if I cut the corners at 45 degree angles like I did with the underneath sections if it would keep the corners down better, and keep it from lifiting the middle of the sheet as well.
 
 

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