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Old 09-18-2013, 10:28 PM   #1
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Garage repairs


Hip roof garage, 21 x 20 feet, late 70's construction.
Contractor used (5) 2" x 6" lumber for the rafter ties from top sill to top sill parallel to the garage door across the 20' span when he built it. The lumber bending strength was insufficient and they sagged. When the garage door was installed, the installer discovered the wormdrive shaft and housing, when attached to the bottom of the first rafter tie, would not provide clearance from the drive to the door top so he notched the rafter tie to level up the drive and clear the door top. This further eroded the strength of the rafter tie(s).

Along came hurricane Ike several years ago and the air pressure changes stressed them further and now I have 4 of the 5 cracked to where I have had to jack them up and place landscape timbers vertically to maintain integrity.
I plan to tear off one end of the hip roof to scab in new rafter ties one at a time until all are replaced. I also installed a storage floor on top of the rafter ties before the damage occured but stored only light items on the floor.
Question is: Do you think replacing with single 2" X 12" is overkill? Would you go with 2" X 8" doubled up? (cost is nearly the same) Composite and engineered beams are much more expensive so I'm leaning away from those. I don't want to put in any post supports. I want to stick to solid span construction. Ideas appreciated!

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Old 09-18-2013, 10:39 PM   #2
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Garage repairs


Single 12's will work fine.

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Old 09-19-2013, 09:12 AM   #3
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Garage repairs


Quote:
Originally Posted by joecaption View Post
Single 12's will work fine.
Thanks, Joecaption.
I added location to my user CP as you suggested.
Also, follow-on question to "garage repairs."
I've seen rafter ties referred to as ceiling joists. What is the common jargon for this "stick" amongst carpenters?
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Old 09-19-2013, 09:16 AM   #4
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Garage repairs


http://www.nachi.org/collar-rafter-ties.htm
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