Questions about foam-board choices between XPS and EPS

1. Please remind me of why (other than environmental toxicity and
flammability) early on you rejected using the 2" thick white (EPS)
polystyrene foam boards in favor of the polyiso foamboards?

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2. If your only choices -- as are mine locally -- are between EPS and XPS,
which would you choose and why? (As in
http://www.homedepot.com/h_d1/N-5yc1v/R-/h_d2/ProductDisplay?langId=-1&storeId=&catalogId=
vs.
http://www.homedepot.com/h_d1/N-5yc1v/R-/h_d2/ProductDisplay?langId=-1&storeId=&catalogId=,
for instance.

3. Was an argument against EPS its lack of rigidity?

3. Was it water permeability? I understand that the EPS styro sops it up
(and loses insulating ability in the process) and that XPS doesn't.

4. If you were going to throw up a quickie small building and would be
encasing the foam boards in fidobe papercrete and a fibrous-cement-like
shell in and out, would you still rule out the less expensive white styro
boards for the initial building? Or would you forgo foam altogether?

Thanks,
ken winston caine

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I was surprised to find that out. That way with ALL the coatings, not just
the elastomeric white. (Didn't check to see what a 5 gallon paint bucket
holds these days. Need to do that next visit.)

The Henry's white elastomeric coating doesn't spread very far. I've used it
before. It's nice, but doesn't spread at all like the typical "aluminum"
roof sealing tar you brush on with a roof-coating broom. At least, didn't
for me.

Best,
ken winston caine

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Since its invention in , Styrofoam™ Brand extruded polystyrene (XPS) has built a rich, storied heritage as an innovative, sustainable building product – creating an entire insulation material category. Its unique closed-cell structure and rigid foam board technology enables XPS to meet core thermal, moisture, air and vapor performance requirements. 

The history of innovation continued in , when DuPont began the process of reformulating Styrofoam™ Brand XPS Insulation to offer a low global warming potential (GWP) version. The transition was completed at the end of . All sites in North America manufacturing Styrofoam™ Brand XPS Insulation now produce a low-GWP formulation signified by a new grey color.

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