[Equest-users] Effective Insulation/Farming Layer R-Value Value

[Chris Baker via Equest-users]

I agree with Daniel on this one.

If you wanted to go above and beyond, you could check out Table A3.3 in the section A tables of 90.1 since it has effective overall U-factors and R-values for different construction types and insulation applications – to include steel framing @ 16 o.c. and 24 o.c.

You can select from the insulation R-values for each construction type and from there you can get the overall U-factor for the entire wall assembly which might also come in handy for any detail edits you might need to make.

There is also an R-value calculator online that will allow you to model each wall component and calculate the overall/composite R-value of the system.  It might just be interesting to compare it to the ASHRAE 90.1 numbers in Section A tables or other values online.

Chris Baker
CCI Alliance of Companies
Fort Wainwright, Alaska
907-356-1681 (x105) office
907-750-4922 cell

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Morteza Kasmai via Equest-users
Sent: Wednesday, July 19, 2017 6:16 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Effective Insulation/Farming Layer R-Value Value

There is a wall section in this project with 4” thick interior polyurethane spray foam inside the metal studs.
Since Table A9.2B of ASHRAE 90.1 does not provide the effective insulation/framing layer R-Value for this type of insulation, how can one calculate this value?

Your thoughts and suggestions would be highly appreciated,
Morteza

[https://lh6.googleusercontent.com/Uuukta80GuFfvKouzA0mdSvUXqml7MtSwSiw-evuGMU=w147-h43-p-no]


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