29 Aug '12, 10am

Insulate a slab in a mild climate #green

We're building a 250 square foot in-law unit on a monolithic slab in zone 3c (bay area, calif.). The slab will be 6.5 inches above grade to meet code. The slab will also double as the finished floor. It will NOT have radiant floor heating. Do you think it's a wise investment to add rigid insulation around the exterior of the slab and under the slab? If so, what r-value should we shoot for? We'll be aiming for about r-20 walls and r-40 roof and we'll be building a tight envelope (I hope). We'll ask some local builders what they think too, but I'd like the opinions of the gurus on this forum too.

Full article: http://www.greenbuildingadvisor.com/community/forum/green...

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