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Old 07-16-2012, 01:05 PM   #1
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Broken roof joist


I took down the drywall in my upstairs bathroom which is connected to the area above my kitchen. (So looking through the wall I can see the area above the kitchen ceiling between the a roof.) I have attached a photo.

I noticed one of the 6" roof joists is broken.
While I have the access I would like to repair it.

I'd assume I can sister it up with a 6" piece of lumber but wanted to know:

1) Should I press the broken piece back into its proper position and then attach a second piece of wood, or leave the broken piece in its same position and attach the new piece?

2) What type of screws should I use?

3) How long past the damaged area should the new wood go?

Any other tips?

Thanks.
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Broken roof joist-photo.jpg  

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Old 07-16-2012, 01:13 PM   #2
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Broken roof joist


Just a couple of guesses being made from that one picture.
Looks like 24" or more spacing on those rafters.
It also looks like there was a roof leak there at some point, has this been fixed?

With spacing like that I'd guess the roof used to or still does have metal roofing.

Yes a patch will work but it needs to be as long as you can possibly fit up into the attic to spread out the load. It also needs a sistered joist on both sides, not just one.
I'd use construton adhevive and 3" ceramic coated decking screws.

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Old 07-16-2012, 01:17 PM   #3
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Broken roof joist


Yes the roof was redone recently.

It's not a metal roof, but rather a very old house.

I didn't think of attaching on both sides, thank you.

Should I place the original beam back in its proper position before attaching the new wood?
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Old 07-16-2012, 01:21 PM   #4
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Broken roof joist


I would screw one end in tight to the sheathing below the crack, then use the new piece as a lever to lift it back in place then screw in the other side.
May take two people, one to lift and one to do the screwing.
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