Q: Does it make a difference on strength when I cut a long thin strip of plywood with the grain or cross grain? I know it makes a difference on hardwood.
A: You probably already know that ply layers in a sheet of plywood alternate. The crisscross pattern lends good strength both along and across the sheet, so cutting a thin strip lengthwise or widthwise shouldn’t really matter much. Of course, the longer and narrower the strip, the weaker it will be either way. When the sheet has an odd number of plys, I find that there’s slightly more strength cutting the strip along the dimension of the sheet that has the greater number of plys facing the same way.