[time-nuts] Thermal insulation choice?

[ed breya]

That stuff at Home Depot is the way to go. You can use regular 
styrofoam from coolers and cold shipping boxes, but there are a lot 
of grades, ranging from crappy to great, and some are even 
biodegradable - not good for this application. The construction types 
are made to last, but also may have fire retardants and preservatives 
that could cause problems. I think the smallest standard sheets will 
be 4' x 8' in the US, in various thicknesses. If you are near any 
construction sites you can sometimes find cutoffs for free in the 
dumpsters - perfect for small projects. I recently scrounged a few 
pieces of the pinkish type - very strong, good stuff, with fine foam, 
it machines nicely, and seems to be chemically inert.

Ed

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