Renforcing Garage Rafters

harleyman91January 2, 2009

While examing my garage rafters wanting to add some storage space approx.8x16 above the roll up garage doors, I have noticed my garage rafters are sagging approx 1.5 inches. They are 20ft. long 2x6. The house is 52 yrs. old and has just had a new roof and sheeting installed. I wanted to jack up the low center spot of the 5 beams and bolt a sister beam (2x6)to them. Will this cause further damage the existing beams? Or should I just bolt a sister beam to the existing sagging rafters to prevent further sagging? Am I risking further damage? Any other suggestions? Thanks

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Do you mean joists? Rafters are the pieces of wood directly under the roof deck and run at an angle toward the peak. Your goal is to add some storage space but no living space, right?

Without looking at a table my gut reaction is that even sistered 2x6's aren't enough for a 20' span. Obviously better than nothing but they should be deeper.

    Bookmark   January 2, 2009 at 9:54AM
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i am thinking you need to sister up 2x10's or 2x12's and give up a few inches in the attic. my garage is 2x12's running 20' and there is NO deflection. even when 3 heavy HVAC guys were up there putting a new airhandler in the ceiling did not move.

    Bookmark   January 3, 2009 at 2:44PM
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