Comparison test of various foamboard cutting tools.
Thank you to all of the commenters who gave suggestions!! ... Sorry if I missed yours. Forgot to mention hot knifebut it won't work on this type of board due to the fiberglass paper doesn't melt.
The foamboard is GAF EnergyGuard.

The best tool!! Olfa 18mm snapeoff blade utility knife: https://www.lowes.com/pd/OLFA1Blade...

Olfa 25mm snapoff blade utility knife: https://www.lowes.com/pd/OLFA1Blade...

0:00 Intro
2:20 Utility knife
3:15 5inone tool
4:20 Taping knife
6:08 Kitchen knife
7:05 Snapblade utility knife
8:20 Fuller insulation knife
10:05 Irwin dovetail flushcut pull saw
11:03 Dewalt Japanese pull saw
12:17 Craftsman western style saw
13:16 Electric knife
14:10 Jigsaw with Bosch soft materials blade
15:24 Reciprocating saw with metal cutting blade
16:54 Circular saw (Skilsaw)
20:08 Conclusion

Disclaimer:
If you choose to imitate, duplicate or copy anything you may have observed in these videos, you do so at your own risk. The creator of this content does not take any responsibility for any action taken as a result of the information or advice on this YouTube channel (or other platforms) and shall not have any liability in respect of any injury or damage that may result.