First time cutting plywood using foam board as support, and it burns, melts, and produces enough smoke that I have to open the garage to ventilate it after every cut. There is no damage to plywood, but burning foam does not support the cut, thus leading to chip out. Here is the example of what it does:
The foam board is a major brand pink insulation from a big box shop. That seems to be the kind that I see being recommended for that purpose, but it appears to be a softer foam than the one it should be, the harder styrofoam-like substance (For instance, Kreg talks about rigid foam insulation). What chemical compounds should I get for this application, and what should I avoid?
I use 4600 rpm worm-drive Skilsaw with the track sled attached and thin kerf 40-tooth blade, so it shouldn't be an issue.