Forgot to ask this regarding the dormer job I’m on.
I’m building two dormers along the back of the house. Two separate rooms. In doing so I’ll be removing MOST of the back roof. The 3 or 4 foot valley that will be left in tact between the two 11 foot wide dormers and the two overhangs at the ends are all that will remain of the old roof. So I’m basically re-roofing the entire back of the house. (And, oddly enough, in a different color than the front AND I won’t be doing the front of the house at any time soon. It’ll be the second time in my life that I live for a few years in a half-n-half roofed house! But I digress …) What I’m wondering is, why not leave the ‘skipjack’ boards on those old original rafters and sheath with the 1/2″cdx over them? Less ‘trauma’ to the original structure of the old roof and, to me, seems like results in a little stronger roof. And also .. why not take off as little as possible … leaving as much of the original as possible? I’m refering to the horizontal 1X4’s that are in pristine condition and run perpendicular to the rafters the full width of the original roof.
Any thoughts?
Thanks,
Terry
Replies
That's what I do.
As long as the 1x4's aren't too far apart I know of no reason not too (I did have an inspector voice concern about the weight issues once, but she didn't press it).
Rich Beckman
Another day, another tool.
Leave the split sheathing and sheath over it. You're on the right track.
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Very Good! That's what I really wanted to do but I could swear I've always seen guys tear it down to the bare rafters ... skipjack and all. Thanks for the feedback -- I'll leave it up!
Terry
> I could swear I've always seen guys tear it down to the bare rafters ...
I thought mine was good, too. But when I got the tile off, it turned out that so much of the one by was termite damaged that the better course was to get rid of it all.
Tear off what turns out to be bad, then figure out whether it would be easier to replace what you removed, or tear the rest off.
-- J.S.
As mentioned, termite damage is the 1st reason to remove old sheathing (for me at least), the second reason is so you can install radient barrier sheathing in its place. If you live in a cold climate, neither of these will matter.
Rebuilding my home in Cypress, CA
Also a CRX fanatic!
The only problem I see is that you likely need to frame by doubling the rafters adjacent to the dormewrs - unless this is shed dormers. Otherwise, I would probably do the same thing. The horizontal pieces are called strapping
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