Styrofoam cup material

Anyone know where you can get large sizes of styrofoam cup material ? Would make a great insulator for the mash tun.

styrofoam sheets at home depot

Depend on what you are trying to do. I've seen several pictures where people have cut foam sheeting and bonded it with spray cans of urethane to make mashing & fermentation cabinets.

If your mash tun is rectangular or square, you can use the styrofoam sheets from a hardware store (in the insulation aisles). If it is a round one (cooler or converted keg) you would be better off getting something called ArmorCoat. Its an extruded rubber insulation product that is flexible and will form around curves better. Not sure if Home Depot carries it, I normally get it from my neighbor (he's an insulator)

The Home Depot stuff is very brittle. Has anyone used heat to slowly bend and form to fit around mash tun ?

I doubt that would be effective. I have accidentally gotten it too hot while sweating copper joints and all it did was melt into a really hard goo. If you can't find the Armor Coat, you may be better off getting the fully encapsulated fiberglas insulation and just taping the hell out of the outside so it doesn't accidentally tear.