Twayne wrote:

In ,
Zz Yzx typed:
My shop has a steel roll-up "garage" door that faces a
blistering sun for several hrs/day. I'm determined to
insulate it. The easiest way I see is to slap some
styrofoam shhet insulation onto it.

I can get 4' X 8' sheets at Big-Box for a good-enouhg
price, but need to trim the sheets down to ~ 44" X 22" to
fit into the recesses of the door.

What's the best way to cut 1-1/2" or 2" styrofoam sheets?
I don't have a "hot wire" cutting tool.

Thanks a heap,
--Zz

If it's real insulating styro and not just the junk stuff:
I use a fine blade in a jig saw for finer work and a ply blade in my
circular saw for the long cuts or arcs. Works well & not a bad mess unless
you twist the circular saw so the back of the blade hits the styro.
Use the closed dell insulating styro; the junk stuff will disappoint you
badly as it's not a good insulator.

HTH,

Twayne`

Absolutely, you want to use the extruded polystyrene (XPS), not the
expanded (bead type) polystyrene (EPS).