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Old 02-13-2014, 11:39 AM   #1
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1/2" joist sag over 5' noticeable under new drywall?


I ripped out a drop ceiling in a recently purchased home and have found the ceiling/2nd floor joists have a 0.5" sag in them over a 5' run. This not structural as per the ST eng. My question is whether or not this would be noticeable once the dry wall has gone back up. This is in a kitchen and will now be an 8' ceiling with can lights.

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Old 02-13-2014, 04:10 PM   #2
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1/2" joist sag over 5' noticeable under new drywall?


As long as your structural engineer says it is OK, the only reason to "fix" it is if you want a flat ceiling. This can easily be done by sanding or planing the joist flat. 1/2 inch in 60 inches is l/D = 120, which may be noticeable.

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Old 02-13-2014, 10:29 PM   #3
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1/2" joist sag over 5' noticeable under new drywall?


It will be more noticeable in larger rooms but not in a small one. May be easier to sister up the joists with straight wood and build it down until it's flat.
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Old 02-15-2014, 08:49 AM   #4
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1/2" joist sag over 5' noticeable under new drywall?


if i had to do that, and wanted to maintain the same ceiling height. i would sister new boards. the use a resip saw to cut off what was sagging below them.
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Old 02-15-2014, 09:39 AM   #5
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1/2" joist sag over 5' noticeable under new drywall?


Is there strapping, or were you planning to attach the drywall right to the joists? Normally there would be strapping running perpendicular to the joists which you could shim to feather out that sag.
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Old 02-15-2014, 11:12 AM   #6
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1/2" joist sag over 5' noticeable under new drywall?


Whether it will be noticeable or not depends on where it is in relation to cabinets and trim, lighting location, etc.

If you have a sag, I wouldn't be planing those joists. Shims and strapping down will flatten the whole ceiling, if you want a totally flat / level ceiling.

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