I have a roof about 50 years old with a 4:12 pitch and 2X4 common rafters.
The problem is at the half way point between the ridge and the top plate on
the wall there is about 3/4 of sag. (About 11 feet from ridge to the
What is the best way to take the sag out of these rafters? I worry that if
I were to attempt to run a brace to the ceiling joist that this would in
effect push the ceiling down.
About the time I had mastered getting the toothpaste back in the tube, then
Depends on what you're using the space for, why it's sagging,
and whether you want correct the sag, or just arrest it.
Will just taking off all of the 9 layers of old shingles next time
you re-roof do the trick? If you're not using the space,
collar joists would probably work.
If you ARE trying to use the space then things
get a little more complicated, but doable.
Or you could just let it sag.
an 11'-0" long rafter at 4 in 12 yields a 10'-5" horizontal span.
A 2x6 at 16 inches on center No2 Douglas Fir will span 12'-1"
That means 2x4s are probably over stressed.
It might be a good idea to remove the roof deck and sister straight
2x6s to the 2x4.
It seems to me that applying force to straighten the existing 2x4s
might split them or do other damage.
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