Roofing Detail

[Slaughter Construction Co]

Not a roofing expert. Need a good detail for the meeting of two different roofing materials and two different pitches. Location in hot dry climate. No snow. Occasional heavy rain.

A 1 in 12 shed roof with roll roofing tying into a 12 in 12 roof with slate shingles.

[NW Architect]

Re: Roofing Detail

Just run the roll roofing 12" up the 12:12 slope and carry the underlayment for the slate down over that.

You can also add a sheet metal flashing over the break to protect the crease in the roll roofing. Fasten it only on the top edge (under the slate underlaymenbt

[Slaughter Construction Co]

Re: Roofing Detail

All though you don't see much of it around here, I was wondering about adding ice and water shield to the mix. I understand that it seals to the substrate and around any nails that may penetrate it. If so, under and over what?

I guess I'm concerned about a strong wind blowing water off the low pitch roof and up under the shingles/underlayment.

I just want to enjoy our next rare rain and not be worrying about a phone call complaining about a leak. :)

[joseph]

Re: Roofing Detail

if i am seeing this right the sticky membrane would go in the crease between the two pitches as an extra .but it would still need the metal flash under the 12:12 and over the 1:12 .no nails in the metal over the 1:12 .you need to be able to get under it later to replace that rolled stuff which most likely will not last as long as slate .Just demo a flat roof .Roofer had three layers of paper under it .seemed smart to me .

[Allan Edwards]

Re: Roofing Detail

Are you using comp shingles or actual slate?

[dgbldr]

Re: Roofing Detail

Not sure what you call "roll roofing" down in TX, but here roll roofing is a cheap asphalt similar to shingle material. It would never be used on the same building as slate, which is one of the most expensive roofing materials.

Also, the roll roofing I see occasionally comes marked with "do not use on slope lass than 2/12" or similar language. You might want to check on that.

[Slaughter Construction Co]

Re: Roofing Detail

Actual slate

[Slaughter Construction Co]

Re: Roofing Detail

Yep, your right. No where but TEXAS. All flash and no class. :)

This is a weird project. About 10 years ago an Archy had designed a facade for a 1956 contemporary house. Its too weird to describe. He stuck this 12 in 12 pitch thing on the roof right in front. It only has about 2 or 3 squares of slate shingles on it. The rest is RR.

The original house had a carport/storage room with a totally flat roof which, not surprisingly, the owner has had nothing but h*ll with. He wants to replace it with a pitched roof which will involve connecting to both types of roofing.

I wouldn't be fooling with it except that he is a friend of a very, very good client who ask me to help him out.

I just wanted to be as/more knowledgeable as the roofer. Thanks