Help Fixing Cracked Rafter

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Old 01-25-09, 02:26 PM
C
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Help Fixing Cracked Rafter

I recently heard a few bangs in the attic recently. After inspection I found three rafters have cracked the full length... minor cracks. The home is 18 years old, stick built (no trusses) and the rafters are 2X10. The roof is a 6/12 pitch. There are collar ties on one of every four rafters. The house was built with Douglas fir.

Can anyone tell me why such an overbuilt roof would crack? There hasn't been more than 1.5 feet of snow ever. What is the best way to repair?

I'm thinking of putting a full length sister rafter next to each of the cracked ones, gluing and nailing them. I also think I should add collar ties on each rafter.

Any help or opinions would be greatly appreciated.
 
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Old 01-25-09, 03:10 PM
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Can't imagine what would cause 2x10 rafters ib 6/12 pitch to crack for no reason!!! That aside, I would try to jack each one back in place and sister another 2x10 to it like you said. I really don't think the collar ties will be of any benefit, but if it makes you feel better then you should do it.

You didn't say how long(span) the rafters are! Maybe what you need after repairs is a knee wall under them!! If you find no problem causing the breaks, that is what I would do.
 
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Old 01-25-09, 05:13 PM
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The roof isn't overbuilt and like Mike says you don't tell us how long the rafters are. A 6" pitch is pretty low. A collar tie every 4' is correct. I have seen one framing member split on occasion but never three. You could, as Mike says, sister a new 2x10 next to each damaged rafter or you could just screw 3/4" plywood scabs on the sides of the damaged pieces.
 
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