I’m adding a 3 in 12 dormer roof to a 7 in 12 roof with existing asphalt shingles. How do I properly flash the side walls of the dormer?
Any advice welcome. TIA.
Framing the floor inside a crawlspace foundation keeps a gable-end addition close to grade.
"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.
Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.
Start Free Trial NowGet instant access to the latest developments in green building, research, and reports from the field.
Start Free Trial Now
Replies
You should probably have a roofer do it... strip back some shingles on the 7:12, tie in new felt, replace shingles and weave in step flashing at the same time. Then you felt and side the walls of the shed.
Thanks for the reply.A roofer would be a good move. I'm a venturing into new territory here. This little framing project is well beyond what I usually do (trim & cab guy). I just don't want any leaks.I was thinking of double flashing--under roofing/up wall, then over roofing and imbedded in asphalt sealant. I'm still unclear on the bestest thing to do.
Not to derail your question but did you take any extra water proofing precautions with a 3:12 roof? I have heard that areas that are prone to wind driven rain can have problems at less than 4:12.
Yes, shingle mfr will most likely not warrant that shallow a slope. Some require ice and water over whole deck at 3/12, which isn't bad considering the small 2' of a dormer. Just be aware of it.
A better low slope product might be modified bitumen roofing; like Mulehide (http://www.mulehide.com/samb/samb.html) or something similar. Doesn't look as good, but I don't know if you can see the top of the shed from anywhere on the ground.
best of luck.
Ithaca, NY "10 square miles, surrounded by reality"
Edited 6/2/2006 9:01 am ET by Stray
No worries, metal roof on the shed (good down to 2 in 12).
The shed roof with the 3:12 will have standing seam metal roofing that is for 2:12 or greater. Could have been an issue, so thanks.
Basswood-
Look at Mike Smith's thread in the photo gallery - it's called "adverse conditions". He's got some pretty good pictures of flashing the side walls for a dormer. I think bedding in muck is overkill; sloppy too. Learn how to do step flashing, it isn't hard. Maybe a little tedious and annoying, but I'm sure you can handle it.
Don K.
EJG Homes Renovations - New Construction - Rentals