RETURN TO I Have An Existing Metal Roof and Have A Question
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I would consider not connecting the roofs -- drop the new one down a bit and connect to the fascia. Connections like you're talking will be prone to trouble, especially at a lower pitch and in your climate. Yes, that will lower your roof pitch on the new roof. As a result, I'd suggest using a mechanically seamed standing seam for the new roof.
I am very sorry. I didn't say what I was thinking! Yes, you'd be attaching to the house but have your decking perhaps meet at the bottom of the fascia. That will still give you a defined separation between the two roof planes. The separation doesn't have to be huge but perhaps so that the top of the ribs on the new roof is 2" or so beneath the higher roof deck. This will ultimately be more trouble free than some sort of transition flashing. But then you need a new roof suitable for the resulting roof pitch.
It still needs to be flashed but in my experience that sort of connection is much easier to keep watertight than a direct connection or transition on this sort of low pitch.
Yes, that would work.
Hello
We want to add a patio / work on car / whatever, extension off the front of an existing shop with a metal roof - joining the existing metal roof with the metal roof of the extension with a sort of pitch break.
The challenge is the 10' height of the existing roof and only having 18" drop to the garage entrance. Ideally we would extend out about 14' but I am thinking the extension roof would not be steep enough. I was planning on installing a pitch break joint where the two roofs meet (but not having an actual difference in pitch - or as little as possible).
Also, being in MT we do have significant snow.
I know with the pitch issue of only having the 18” drop - and the target of 14’ I will have to compromise but trying to figure how much and where.
@tmiller@classicroof.com said:
I would consider not connecting the roofs -- drop the new one down a bit and connect to the fascia. Connections like you're talking will be prone to trouble, especially at a lower pitch and in your climate. Yes, that will lower your roof pitch on the new roof. As a result, I'd suggest using a mechanically seamed standing seam for the new roof.
I was under the impression we would use the fascia and it would come out even with existing if we did. but i am no roofing terminology expert so might be missing something. Dropping down would mean connection on side of bldg under soffit wouldn't it?
So a 2" drop from higher roof to lower roof is not prone to water or snow issues in that 2" area?
It just goes higher deck - 90 degree 2" fascia -lower deck (with lower deck rafters connecting to building under the soffit?
OK so if my fascia is 6" you are saying land lower roof metal 2" down that 6" fascia and then do a Z flash from under upper roof metal to fascia face to over lower roof metal? So in this setup the fascia is like a ledger board to attach the lower roof.
