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Slate Affair Inc.
Senior Member
Username: Slate_man

Post Number: 219
Registered: 01-2007
Posted on Friday, March 28, 2008 - 06:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Well it seem like there more going on then what you can say in words. Maybe a picture with slope directions and roof details/info/type would help. It seem that there is more then one area.

As far as the detail you were asking about the interestion of the two roof, over kill, to protect the fact that the roof will have snow there. Use copper or other materials that go with slate unlike the mod.bit roof.

What do you see, as far as snow in the area?
Can you get to the different 1/ 12 roof to make into patios or green roofs with matching slate stone ways. Is there a good view up there? Have you looked into that? You could make that in to a great green roof for the summers. You need to make sure that the sun gets in to this area.

Make the drain big in the 1/12 area which could be connected to a tank. Way up at the top of the house. This could feed the toilet for flushing. Gravity feed!
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Greg Nunley
New member
Username: Gnunley

Post Number: 2
Registered: 03-2008
Posted on Friday, March 28, 2008 - 06:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

This is a huge home - the top level roof is approx. 8500 sq. ft. the center area of the high roof has 25 sqs. of mod. bit. which drains internally. the entire perimeter of this roof has the 21/12 slate roof that drops down to the 1/12 roof on the north and south ends of the house. The east and west sides are slate only. These low sloped roofs are used for equipment and generators etc. The slate is 3/16" thick. The 1/12 roofs are about 6 sqs. each.
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Slate Affair Inc.
Senior Member
Username: Slate_man

Post Number: 217
Registered: 01-2007
Posted on Friday, March 28, 2008 - 02:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Why can't you do what Kurtis said(Only jump up the copper to a 32 oz seeing that the slate roof is so steep, its going to last alot longer.) and then also change the pitch on the 1/12 roof to a 5/12. Is there a need to leave that roof so low. Get rid of the mod.bit roof go with a metal. Design the roof area so the snow will fall off. How thick is the slate.

You could also put a sweep there to make the snow move away from the intersection. So a 21/12 going into a 12/12 to the 1/12 with the details of a good block copper 32oz copper roof instead of the mod.bit roof.

How big is the 1/12 roof? Could you hip it? What side is it this area facing north, south, east , west?
Is the roof contracted to a roofer?
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Kurtis Hord
Advanced Member
Username: Kwhord

Post Number: 43
Registered: 10-2006
Posted on Friday, March 28, 2008 - 02:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Words of wisdom. :)
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Walter Musson
Senior Member
Username: Walter_musson

Post Number: 70
Registered: 07-2006
Posted on Friday, March 28, 2008 - 02:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

I'd go back to the drawing board on that one.
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Kurtis Hord
Advanced Member
Username: Kwhord

Post Number: 42
Registered: 10-2006
Posted on Friday, March 28, 2008 - 10:28 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

If you're going to use slate, make sure all of the detailing uses a material that will last as long as the slate installation. The flat section should have a flat-lock roof constructed of 20oz copper, or TCSII. The metal roof can run up under the slate as far as you need, and it will all be a solid membrane.
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Greg Nunley
New member
Username: Gnunley

Post Number: 1
Registered: 03-2008
Posted on Friday, March 28, 2008 - 10:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

I am designing a detail on a 21/12 slate roof where the roof eave intersects with a 1/12 mod.bit roof. My concern is from snow build-up and melt at this slope transition. I read Joe Jenkins articles about using a peel and stick - but I am considering a heavier mod. bit. base sheet to run from the mod bit roof and up the slope about 36" high. Does anybody have any suggestions or a detail to use here. This house is on the west side of lake Michigan (near Chicago) and is 4 stories high right on the lake

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