[Equest-users] icynene spray foam

[Nick Caton]

Icynene is hot stuff because it's also an air barrier.

 

I reckon if you define an appropriate R-value for your icynene/joist
layer and another continuous layer for anything beyond, you should be
able to account for the air barrier seal by ensuring there's zero
infiltration through that construction.  Infiltration is handled at the
space and/or construction levels depending on the method you're using to
define it... best I can say is to look into it.

 

Maybe I'm underthinking it, but I think that's all you should need to do
to demonstrate a difference against batt - pay attention to you
infiltration inputs.

 

~Nick

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe
Snider
Sent: Friday, October 15, 2010 10:41 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] icynene spray foam

 

Does anyone know how to adjust for icynene spreay foam insulation in a
sealed attic space - closest option seems to be to select R-19 batt on
the underside of the roof deck, but this isn't very accurate because
icynene in a sealed attic provides a significantly better performance
than just R-19 on underside of pitched roof?

 

Thanks,

 

Joe Snider

 

---

Joe Snider, AIA, LEED AP

 

SEQUIL Systems, Inc.

high performance sustainable structures

 

1 SE 4th Ave, Suite 205

Delray Beach, FL 33483

t: 561.921.0900

f: 561.208.6090

 

www.SEQUIL.com

 

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