How to straighten sagging roof trusses

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Joined: Mon May 09, 2011 6:40 pm

How to straighten sagging roof trusses

Post by 84american » Mon May 09, 2011 6:54 pm

We live in a 84 American 14 wide MH. In the living room, part of the cieling is sagging from the weight of a cooler that used to be on the roof. The sag is about 4 trusses wide, and the trusses are straight on each side of the sag. The cooler is no longer on the roof and the part of the ceiling where the cooler vent used to be is covered with drywall. I was thinking about making some new trusses out of 1/2" plywood and fastening the bottom of the sagging trusses to them while they were jacked up straight. I've also ready where a 1x4 with trimmed ends might be just as effective and easier. Also, the sag affects one cieling panel and the mating edges of the two adjoining panels. Can I replace an entire panel ( 4'x 14') with regular sheetrock ? I'm fairly handy with drywall finishing but wasn't sure about the thickness or weight.

David Oxhandler
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Joined: Tue Oct 02, 2007 8:37 am

Re: How to straighten sagging roof trusses

Post by David Oxhandler » Mon May 09, 2011 8:10 pm

If the roof is still solid you want to go in thru the ceiling. Remove the ceiling boards and take a look at what is broken. If you are not going to load weight on the roof again you may be able to fasten "helpers" where ever the truss or rafter member is broken.

Straighten out the broken piece if necessary use a jack and wide dead-man for support. Once the truss-rafter is straightened, stiffen it by fastening another like size stick of wood the entire length. If you need to you can block in all sides of the truss.

If the truss is shattered build another like size one and replace it or install it right next to the broken one. Installing a new truss and getting a tight roof over it can be tricky.

You will find plastic stretched out above the ceiling. supporting the insulation. If your lucky it will be rolled insulation. If its blown insulation you might be able to shift it over another section of ceiling while you make repairs. Either way don't neglect to repair the vapor barrier plastic and replace the insulation, prior to closing up the ceiling. Be sure to take precautions and observe safety practices when you handle insulation

Replace the ceiling with light weight drywall boards. Finish as you would any other ceiling.
David Oxhandler
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