I'm finishing my basement with 1x3s on the ceiling to attach wallboard.
Unfortunately, two of the ceiling joists are about 1/2 inch lower than every
other joist. They aren't sagging--they were just put in (with hangers) too
What's the best way to deal with this so that I can have a level ceiling?
I'm thinking about running a 1/2" shim piece between the joists and the 1X3
on all but the two low joists. Will this work?
If the joists are set lower than all the other joists,
I should think they are not supporting the loads they are supposed to
I'd consider having them set at the correct level.
This would address what appears from your post to be a structural flaw.
That would work but unless this is a really small room I would run the 1 x 3
normally across all the good ones. Where the 1 x 3 hits a low joist I would
cut the 1 x 3 just short of the joist, nail a 2 x 4 block to the joist and
adjust it so the 1 x 3 was at the correct height.
Is the floor above bowed down at the location of the low joists,
or are the joists taller than the others.
If the floor is sagging at the low joists, it may be possible to jack
them into proper position.
No, there's no sagging of any kind. Basically, the people who built the
house were incompetent--they put the hanger half an inch lower because the
2x8 was a bit wider than it should have been--probably just cheap cuts of
You could use resilient channel (metal stud) and cut them to go around
the lower floor joists. It's quick, cheap and improves noise
I think you should explain a bit more about those two lower joists.
Are you saying that the bottoms, and inferrentially the tops, are set
lower? Or do you mean that two of the joists are deeper and were set
lower to allow the tops to be in plane?
Better off cutting two correctly sized joists and replacing the oversized
ones (if they are oversized). Alternatively adjust the hangers. I would
like to be more sympathetic but a mistake has been made and unless this is
remedied then no matter what you do, the mistake will still be there and a
lumpy ceiling will be reminding you of that point until eternity.
Cut some short straight timbers and temporarily fix them across the
correctly positioned joists and then lay your (newly positioned) joist on
the cross pieces and fix the hangers and that will ensure they are all the
same depth for a flat ceiling.
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