Everything I cut is stack cut using 1/4-inch ply. I only stack cut 2 pieces. I've found stacking 3 poses a bit of a problem with the deviation of the blade when pressing through a cut. If you do stack cut three, you have to slow your cuts and let the blade "catch up" especially on sharper turns. The largest I've stack cut is 14X21 and I didn't have any problems, even on my 16-inch saw. I typically use spiral blades and tend to use a smaller blade than typical. (between 2/0 and 1) Like Clayton said, if you used 1/8 ply, you could probably get away with triple stack without any problems. Good luck.