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young-jennifer 12-14-2008 03:16 PM

My roof is sagging - Correct Course of Correct Repair?
My roof is sagging due to beams through out my attic sagging and cross beams bowing and pulling apart. This happened due to hurricane Ike.
I hired a contracting company to repair the attic and put on a new roof. I'm concerned because we agreed they would repair the attic and then put on the roof in case the decking and existing roof took more damage.
My question is, don't they need to use a hydraulic jack or another type to raise the sagging areas and then brace the area with a truss? I helped and watched this work done many years ago. I know we had to replace to roof afterwards.

the roofing god 12-14-2008 09:32 PM

you can usually use other boards as a lever for positioning small beams etc,for really heavy stuff,you would use a jack

iMisspell 12-14-2008 09:40 PM


Originally Posted by Ed the Roofer (Post 112510)
It may have been installed with the grain in the wrong direction.

Could you (or someone else) explain this.
Do you mean laying the sheathing horizontally or vertically ?

the roofing god 12-14-2008 09:56 PM

What Ed meant was the 8 ft. length should run a\opposite the direction of the rafters run(grain is the lines in the plywood)

usually a bow is from a rafter that wasn`t crowned properly during framing,meaning rafters are examined prior to rafter layout so the curve/crown faces up,all facing the right way means they settle along the same pattern,and roof looks good,one or two facing the wrong way-means those rafters are curing in opposite directions-hence the bow--plywood against the grain would have very poor strength,but will not necessarily show a bow/dip in the plane of the roof

ncgrogan 12-15-2008 10:20 AM

If it happened directly from a hurricane, my guess is it came from positive pressure causing the sheathing to deflect enough to push out the lateral bracing between the rafters/trusses. Thats a lot of force and I would of thought the other side would have blown off as negative pressure is usually higher. Sounds like the roof and sheathing needs to be removed in the affected area and try to realign the rafters/trusses or replace them, THEN put your sheathing and roof back on

losttool 12-15-2008 07:59 PM

I agree with the last post. There must be some bad rafters if you can see a bow. Keep replacing until there is nothing crooked. If the sheathing was OSB and got wet then it's history.:huh:

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