Drywall – How to level uneven ceiling joists for sheetrock placement

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So I noticed that my 1961 year old one floor home joists are not even, some areas it's bowed down.
I ran a string line, I see about 1/2 inch low points in few areas.

I have read the standard fix to this is strap the ceiling with 1X3 straps, perpendicular to the joists at 16 on center.

If I do not want to have perpendicular straps crisscrossing my ceiling, can I level the ceiling by attaching 1/2 inch Birch Plywood strips, attachedenter image description here along the joists (not perpendicular), and shimming where necessary? Thank you.
Alex

Best Answer

Sister with steel stud using a lazer. Lazer a line across at your lowest point and sister on the line. Steel stud will stay come straight, stay straight throughout the installation and after the installation. It's easy to notch around existing obstacles and easy to work around with anything new going in.

This is actually a perfect example enter image description here www.finehomebuilding.com

If you don't have a lazer a string works well too.

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