Bending plywood for roof
I'm installing new 7/16 plywood on the roof of a trailer. The framework in the roof is flat and then angles down a few degrees near the edge (as opposed to having a gradual curve all the way across). ...
Forum Discussion
forgo the 7/16 single sheet of plywood and instead use two thinner sheets of plywood laminated in place. Thinner sheets will bend and conform much easier than one thick piece and will be far stronger, faster and safer than sawing a lot of relief cuts to the underside of the plywood..
7/16 is .435" or about 10.1 mm (I don't speak mm but in this case it makes it easier to understand).
You could us two layers of "1/4" Luan which now days and is sold in mm thickness of 5.2 mm..
By the way, as long as you are not planning a lot of foot traffic on the roof, most manufacturers only use 1/4" for the roof and only add additional reinforcement at the roof vent where the roof air will be located.
Glue and screw the first layer down then glue and screw the second layer to the first layer..
Then cover with your choice of roofing material.
Laminating thinner materials in place is how a lot of boat builders make those sharp bends without breaking material or adding a lot of stress in the wrong places (that wood will always want to return to it's natural unbent state).
7/16 is .435" or about 10.1 mm (I don't speak mm but in this case it makes it easier to understand).
You could us two layers of "1/4" Luan which now days and is sold in mm thickness of 5.2 mm..
By the way, as long as you are not planning a lot of foot traffic on the roof, most manufacturers only use 1/4" for the roof and only add additional reinforcement at the roof vent where the roof air will be located.
Glue and screw the first layer down then glue and screw the second layer to the first layer..
Then cover with your choice of roofing material.
Laminating thinner materials in place is how a lot of boat builders make those sharp bends without breaking material or adding a lot of stress in the wrong places (that wood will always want to return to it's natural unbent state).
