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noctua_gw

C-200 vs C-300 XPS

Noctua
10 years ago

I am looking at foam insulation for my home.

I have found C-200 for $8 less a sheet than C-300.

The Owens spec sheet for c-300 as well as f400 f600 and f1000 foam board. I can not find one for c-200.

The main difference seems to be compressive strength.

I was looking for exterior walls, roof and basement under retrofit floor heating slab. If the only difference is compressive strength i should be able to get C-200 for everything but under the slab, i think. Even then i am looking at 1.5 to 2 inch concrete for the pour.

Is the only difference compressive strength?

Would c-200 work for all my areas or would i need c-300 for under the floor?

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