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07/04/2011

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dana

With foil faced iso on the interior the foundation can no longer dry toward the interior, which raises the risk to the foundation sill, unless a very good capillary break is in place between the foundation sill & the concrete. Keep an eye on it! (Maybe even seasonal spot-checking the timber with a humidity meter.)

Reclaimed EPS or fiber-faced iso(from commercial re-roofing project) can usually be had for ~3cents/R/square foot, sometimes less, but you have to dig a bit to find a source (craigslist, or in central MA, The Insulation Depot in Framingham- pick up only for small quantities), and is perfect for basement insulation projects.

1x strapping and tapcons through-screwed to the foundation are one way to mount glass faced gypsum (or greenboard) are mold-resistant ways to achieve the code-required ignition barrier. In an air-tight house with a mini-split, controlling the indoor RH to something that results in a 60% RH or less in a conditioned basement should use very little power.

In most of MA subsoil temps are low enough that insulating the basement floor to at least R8 (if virgin-stock, more, using reclaimed foam) either over or under the structural slab. If over the slab, if the basement is at all susceptible to flooding a 2" concrete rat-slab poured over the foam works as an ignition barrier but if the basement is to be finished and it's flood-free, an OSB or plywood subfloor (anchored to the slab with tapcons) also meets code.

Foam Roof

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spray foam wall insulation

With aluminum foil confronted is on the internal the groundwork can no more dry toward the internal, which increases the danger to the groundwork sill, unless a very excellent capillary separate is in position between the groundwork sill & the tangible. Keep an eye on it! (Maybe even periodic spot-checking the wood with a moisture gauge.)

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