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ThinkSharp OP t1_j5zd5re wrote

Reply to comment by danauns in Insulating crawl space with sub-grade walls, or spray insulate floors? by ThinkSharp

For sure! I had one quote it with the sump pump work but ended up saying no because of the cost. I had them run 12 mil white vapor barrier up every wall, however, so I have a head start.

So, in terms of floor warmth and energy savings- is a full encap equivalent to insulating just the floors? Cost aside.

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danauns t1_j5znhfi wrote

It's just, different. Apples to oranges really.

Insulating the floor effectively turns the floor into an exterior wall..

Encapsulation keeps the exterior, to the actual outside and elevates the 'envelope' performance of your home, which is typically a massive gain in terms of energy efficiency ~and air quality.

I've never approached this from the perspective of floor temperature, it's always been more of an efficiency and air quality exercise.

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ThinkSharp OP t1_j5zo28v wrote

Fair enough. What’s the proper adhesive for rigid foam against a vapor barrier? (I would assume I could put foam on the vapor barrier I have, wouldn’t have to put it under it and against the CMU?)

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danauns t1_j5zql6p wrote

What's the foundation wall?

I really like the insulfast/ramset - really quick no no fiddling around. Click, bang done.

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ThinkSharp OP t1_j60j8v4 wrote

CMU, no termite powder treatment or anything just standard. LACKS a metal termite shield however so I want to leave a 1/2 gap to monitor for tubes.

The company that installed the vapor barrier up the walls does encaps too. They drilled and used a plastic one-way fastener.

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