I live in the Seattle area and am re-siding my house with 1/2 x 6 beveled cedar siding. I recently had a post on installation and someone suggested that I might seal the step flashing on the roof to the sheathing with Vycor, starting about 1″ from the bottom of the flashing. The roof is about two years old. All agreed that this is a good idea? If so, what would be best: Ice and Water Shield, Tri-Flex 30, or Ultra? I’m not familiar with Vycor at all.
Also, the paper covering the sheathing is mostly asphalt felt(house was built in 1928)? Not sure of the weight, 30# or 15#? Should I continue with that, or can I get away with a plain paper wrap? Are there different varieties of paper?
Edited 7/27/2006 11:33 am ET by redoak
Replies
Here's a few links on vycor, which is a Grace product similar to their Ice and Water shield (its thinner and comes in flashing size rolls).
http://www.na.graceconstruction.com/product.cfm?mode=c&id=41&did=26
http://www.graceathome.com/pages/flashingprod.htm
In this pic from a thread in Jan 06, you can see the Ice and water sheild up the side of the sheathing from the roof, that is probably what they were talking about. This picture shows the tyvek running behind the I &W, that is a bad practice. What you should do is use a Grace I&W shield to cover the roof and wall intersection, then put up your step flashing and have the tar paper flap over the step flashing, so everything over laps to keep out water if it ever got behind the siding.
You could use Grace I&W (the rolls are 36" wide) and cut it down to 18" wide or buy the Grace detail membrane which is the I&W already at the 18" width. The grace is a sticky rubbery product that seals that area incase of a failure of some area.
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DDay,Thanks for replying. And for a good pic as well as your links. In my case, the new roof is ALREADY ON, as is the step flashing. I can see how it SHOULD have been done. Given that the step flashing is already there, his suggestion was that I apply the I&W OVER the step flashing and onto the sheathing, then apply the tar paper over the step flashing as you suggested.
That would work as far as keep any water that got behind the siding from getting into the wall to roof area, since the I&W seals to the sheathing. It will definitely stink for the next roof if you need to redo the step flashing, the I&W will stick to that like crazy.
That pick was just to so you the I&W, it was not run correctly in that pic though. The I&W should go on the plywood sheathing (wall to roof) then the step flashing, then the tyvek/felt flapped over the step flashing. You basically run everything to deal with the path of water, overlap. Even the I&W that sticks to the sheathing, you over lap just to make sure.
It will definitely stink for the next roof if you need to redo the step flashing, the I&W will stick to that like crazy.Good point; hadn't thought of that. Well, it's a 30 year roof and if I'm not dead by then, we certainly won't be living here by then(not with property taxes going up as fast as they are).