Client wants the shakes on three sheds/barns torn off and the shakes replaced with arch shingles to match the house. I don’t do much on roofs, I’ve fallen off of one and my liability ins. doesn’t cover roofing. But these are small enough to where I am thinking about doing them; at least it is something different.
The problem is, one of the outbuildings (the milking shed) starts out from the ridge as a 12/12 pitch. A shed addition was tacked on years ago, so one side goes from the 12/12 to about a 3/12. 3/12 is shallow for shingles, but the clients aren’t thrilled with roll-roofing and transition to shingles. They want to know why I can’t just shingle the whole thing.
My first response was because of ice dams, but as the words were springing forth, I realized that the sheds, unheated, probably do not have the concern.
So the question is, Would you shingle the whole enchilada, or roll the shed and shingle the rest? (Understanding the skip sheathing will have to be replaced regardless what the outcome is.)
TIA
Replies
Don't know the rest of the answer, but you're right--ice dams are a problem when snow melts over a heated space and runs down the roof to the unheated overhang where it freezes. The new melt water has no exit and backs up under the shingles. An unheated roof should not have this problem. You could instal ice guard (bituthene) over the whole 3/12 roof instead of felt and that should solve any problems, but it is expensive.
I suppose you could have less than the standard 5" reveal (i.e. overalp them more.)
I wouldn't do that with architectural gade shingles, but it works with regulars to drop down to 4"
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I suppose you could have less than the standard 5" reveal (i.e. overalp them more.) (For some reason the dam computer posted this message back to me, and I've already heard it!)
You should not answer this here to us. Is it legal in your area to work as a contractor when you are not covered by insurance? Will your client know he's hiring someone uninsured?
Regular asphalt shingles can handle it down to 3/12 but architecturals have a thicker headlap so they like 4/12 better.
I wouldn't hesitate to do it with a double ply of felt under it for a shed because it shouldn't have any ice damning
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I've seen arch shingles on this very slope fail from rain alone. Ripped off and replaced with Grace and the same shingles. This was about 8 years ago and no problems yet. This was on an unheated space also.
How big is the portion in question?
Cover with ice and water shield (@ $38/sq.) and forget about it. It might add $100 to the bill?
Jon Blakemore
Sounds like a plan. Either that or double the layer of felt, as per Piffin's suggestion. The area is just under a square.
Thanks all.
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