nealtw
Contractor retired
Yes I understand that but it would still be 20 ft from the gables so that would not be close enough. You would still have a problem somewhat less.The center wall would on be 24', the same as the gable end walls.
Yes I understand that but it would still be 20 ft from the gables so that would not be close enough. You would still have a problem somewhat less.The center wall would on be 24', the same as the gable end walls.
My hindsight analogy is if the builder had put a collar tie at each rafter and thru bolted them or nailed and clinched them. It would have cost a couple hundred bucks more and it would be fine now. If the collar takes the force the knee wall sees none.
No, collar and rafter ties are both called for, for a reason. even if you could hold the top together, the rafters sag and let the walls out.
When you build it you only have so many choices.
Stiff walls like balloon framing.
Ridge beam
Trusses.
Rafter ties, the floor would do this if the walls were stiff.
I just talked to an engineer about installing a beam.
He said the same as I thought the roof has to be brought back into shape first.
He said he has called for beams and inspected the beams after they were installed and didn't know how they get the roof back in shape.
The rafters will only sag if they are undersize. They are free to bow in any roof with the ends fixed and connected to the floor joist. I do agree this framing of the knee wall should never been set on the floor like that and not ties to the first floor framing balloon or other. But in this roof the collars were not enough or most likely not connected well enough for the spread.
My feeling is the rafter size is fine.
OK but all rafter roofs have both rafter and collar ties, you won't find an engineer that would approve what he has.
Vaulted trusses always have the inside at a lesser pitch. The lower member acts as both the collar and the rafter tie.
The reason that an engineer would not approve what he has, is because of the knee walls, which have rotated.
In conventional framing when the ceiling joist are perpendicular to the rafters, collar ties are common and an acceptable practice.
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