Bending plywood for roof

theoldwizard1 wrote:
For that thickness of plywood, I would kerf the back side with a circular saw about 1 ply deep. It will take several kerfs about 2"-4" apart. Fasten the flat end down and SLOWLY apply pressure to bend it.

I did something similar on plywood when I made a boat in shop class and also when I made a bend in a fence rail.
I don't think only cutting one ply will make it bendable however.
I also cut them closer than 2 inches.
bumpy

theoldwizard1 wrote:
For that thickness of plywood, I would kerf the back side with a circular saw about 1 ply deep. It will take several kerfs about 2"-4" apart. Fasten the flat end down and SLOWLY apply pressure to bend it.

This the way to do it so you get a uniform curve and plywood that doesn't want to flatten back out. Use glue and screws.

Apply Loctite PL3 to the radiused portion of the roof joists then screw the plywood down only on the radiused portion. Run the sheets the length of the RV as there are easier to bend side to side. Next day stand on the plywood and it will easily follow the contour of the roof and fasten down. You can block the edged down the center of the RV to make it strong between the trusses.

Check YOUTUBE for how to bend plywood. Lots of info available.

For that thickness of plywood, I would kerf the back side with a circular saw about 1 ply deep. It will take several kerfs about 2"-4" apart. Fasten the flat end down and SLOWLY apply pressure to bend it.