EPDM Roof With A Twist

 
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Old 09-30-2017, 06:23 PM   #1
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EPDM Roof With A Twist


Hi guys....and girls... Designed a tiny home with a slightly different roof line and have a couple of questions on the install. I'm using 60 mil Carlisle EPDM.....unfortunately I couldn't get anything wider then 10ft, so they'll be 4 seams and the first one will be centered at the middle of the 14'x40' home and working out each way from there. Roof has 7/16 OSB (rough side up) with rafters at 16" centers. I'll go over the roof deck with some 100 grit and soften any burs etc. before I lay the EPDM. Was thinking of wrapping the EPDM over the edges about 3" and fasten with roofing nails, possibly put a bead of lap sealant and or between the EPDM and wood 2x10 facia..(?), where the nails will penetrate. Place brown aluminum drip edge (2 1/2" (top) x 1 3/4" (hangs down facia)) on roof and securing with ring shanked nails/roofing nails(?) and finish with the Carlisle 6" overlayment strip. Cut EPDM flush with the bottom of the drip edge. 10" metal facia will be stuffed up between the membrane and drip edge.....caulked where the drip edge meets the facia if need be. Alls seams with have the 6" Carlisle Securtape. Most likely use 2 coats of bonding adhesive for maximum adhesion on the OSB. Does this sound OK relative to the design of the roof? Do i need termination bars? Assuming I need 1/8" gaps between the 4x8 sheets of OSB. Also....I'm putting a low slope wood stove flashing on the roof (stove pipe will have a spark arrester) and not quite sure how to seal it....being galvanized steel and all. And......Being that the trailing edge changes to a leading edge on the same side of the roof...should I be using any lap sealant on the edge/corner of the roof.......where the EPdM stops?
Ends of roof are a 2/12 pitch (opposite to each other) and rises and falls 3/4" per foot, flat in the very center.

Thanks.
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Last edited by Sealik; 09-30-2017 at 06:28 PM.
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Old 09-30-2017, 08:00 PM   #2
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Re: EPDM Roof With A Twist


Also should mention that there will be 3.5" of closed cell spray foam on the underside of the roof.
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Old 09-30-2017, 08:24 PM   #3
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Re: EPDM Roof With A Twist


I like a cover board between osb and plywood. The rest sounds fine. I typically donít see any type of seam roll on epdm.


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Old 09-30-2017, 09:28 PM   #4
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Re: EPDM Roof With A Twist


Skip the sanding and put down a layer of IOS or at the very least celotex
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Old 09-30-2017, 10:26 PM   #5
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Re: EPDM Roof With A Twist


Quote:
Originally Posted by slowsol View Post
I like a cover board between osb and plywood. The rest sounds fine. I typically donít see any type of seam roll on epdm.


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Cheap insurance

Also I prefer to cut the edge flush as it makes the drip application much cleaner. Also the only place I ever caulk is where my coverstrip overlaps, just a little dab in the corner.

Last edited by A&E Exteriors; 09-30-2017 at 10:31 PM.
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Old 10-01-2017, 12:18 AM   #6
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Re: EPDM Roof With A Twist


Very interesting skewed roof, wonder if there will be issues because of it? I really like the design, so innovative and looks good also!
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Old 10-01-2017, 10:29 AM   #7
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Re: EPDM Roof With A Twist


Quote:
Originally Posted by slowsol View Post
I like a cover board between osb and plywood. The rest sounds fine. I typically donít see any type of seam roll on epdm.


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Any cons when not using the cover board? Not sure I can even get it in this locale. Thought the seam tape was the norm....lol
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Old 10-01-2017, 10:32 AM   #8
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Re: EPDM Roof With A Twist


Quote:
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Skip the sanding and put down a layer of IOS or at the very least celotex
Sanding would probably take about an hour....just to knock down any area where the nail left any splinters. I'll try....but not sure i can get ISO (?) or celotex.
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Old 10-01-2017, 10:34 AM   #9
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Re: EPDM Roof With A Twist


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Cheap insurance

Also I prefer to cut the edge flush as it makes the drip application much cleaner. Also the only place I ever caulk is where my coverstrip overlaps, just a little dab in the corner.
Which edge?
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Old 10-01-2017, 10:35 AM   #10
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Re: EPDM Roof With A Twist


Well, I'm sure in Canada you can get iso board. A coverboard of some sorts over the sheeting and under the membrane is the cheapest insurance you can get. Also adds to your insulation value
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Old 10-01-2017, 10:38 AM   #11
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Re: EPDM Roof With A Twist


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Which edge?
Where the roofline meets the facia, if you fold and nail it over the edge it has a tendency to make your drip look like
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Old 10-01-2017, 10:40 AM   #12
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Re: EPDM Roof With A Twist


Quote:
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Very interesting skewed roof, wonder if there will be issues because of it? I really like the design, so innovative and looks good also!
Thanks.....Good question....we shall see....lol. For application of EPDM- the 'only' issue I can see would be trying to lay larger sheets on the roof to glue together? Because of the skew....
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Old 10-01-2017, 10:47 AM   #13
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Re: EPDM Roof With A Twist


Quote:
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Well, I'm sure in Canada you can get iso board. A coverboard of some sorts over the sheeting and under the membrane is the cheapest insurance you can get. Also adds to your insulation value
The insurance would be if the EPDM had to be ever removed? And the smoother surface itself? I'm above the required R value for roof insulation. Would the roof require a nailer board around the perimeter, next to the fiberboard? For a more solid edge to nail the top of the drip edge to.
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Old 10-01-2017, 10:52 AM   #14
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Re: EPDM Roof With A Twist


Unsur ance against a spli.ter poking a small hole in the membrane of a faster backing out and puncturing it. I wouldn't sweat a nailer board, just make sure you use a long enough fastener to grab and hold the framing. Either a 3" roofing nail (ring shank if you can find it) or a flat roof screw with no plate and you will be fine
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Old 10-01-2017, 11:14 AM   #15
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Re: EPDM Roof With A Twist


Quote:
Originally Posted by A&E Exteriors View Post
Unsur ance against a spli.ter poking a small hole in the membrane of a faster backing out and puncturing it. I wouldn't sweat a nailer board, just make sure you use a long enough fastener to grab and hold the framing. Either a 3" roofing nail (ring shank if you can find it) or a flat roof screw with no plate and you will be fine

Thickness of fiberboard? Also...how many mechanical fasteners per 2x8 sheet? Thanks...

Last edited by Sealik; 10-01-2017 at 11:19 AM.
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Old 10-01-2017, 11:26 AM   #16
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Re: EPDM Roof With A Twist


Quote:
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Thickness of fiberboard? Also...how many mechanical fasteners per 2x8 sheet? Thanks...
Fiberboard is the celotex I was referring too and is usually 1/2" thick. On a 2x8'sheet I would use 8 screws and plates
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Old 10-02-2017, 02:19 PM   #17
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Re: EPDM Roof With A Twist


Quote:
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Fiberboard is the celotex I was referring too and is usually 1/2" thick. On a 2x8'sheet I would use 8 screws and plates
Talked to the local building supply company who in turn contacted a couple of roofing supply companies and.....the only thing available would be the 1/2" donnacona wall fiber board (garbage). Still waiting to here back from a few other sources....but doesn't look good.
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Old 10-02-2017, 03:01 PM   #18
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Re: EPDM Roof With A Twist


Quote:
Originally Posted by Sealik View Post
Talked to the local building supply company who in turn contacted a couple of roofing supply companies and.....the only thing available would be the 1/2" donnacona wall fiber board (garbage). Still waiting to here back from a few other sources....but doesn't look good.
That is what you want, same as celotex....it is simply to keep something stupid (splinter nailhead etc) from making a pinhole that you will never find when it leaks
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Old 10-02-2017, 03:02 PM   #19
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Re: EPDM Roof With A Twist


...

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Old 11-07-2017, 11:24 PM   #20
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Re: EPDM Roof With A Twist


Very cool design but looks like a nightmare with sealing, insulation, and upkeep.

Emily
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