[Equest-users] Question - Exterior roof insulation (DD Wizard sheet 3)

[John Aulbach]

Chris:
 
I believe you can always "sandwich" insulation on top of one another. Just be careful to take into account if there is any structural cavity where steel structure peeks through the insulation.
 
John R. Aulbach, PE


________________________________
From: Chris Baker <CBaker at cci-alliance.com>
To: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org> 
Sent: 
Subject: [Equest-users] Question - Exterior roof insulation (DD Wizard sheet 3)



I have a question regarding “Roof Surfaces” on sheet 3 of the DD Wizard – particularly the fields “Exterior Insulation” and “additional Insulation”.
 
Our roof buildup is as follows..
 
2” standing seam aluminum panels (blue/medium)
Carlisle WIP 401LT self adhering roof underlayment
¾” CDX Plywood
8.5” EPS Insulation with Z-purlins @ 48” o.c.
Carlisle WIP 401LT self adhering roof underlayment
5/8” densdeck roof board
2x4 sleepers @ 24 o.c. (3.5” EPS insulation in between that)
 
Structural steel @ 24 o.c. minimum supporting above
 
The max exterior insulation I can select is 6 in. (R-42).  Is it acceptable to select that (the max allowed) and then add additional insulation to approximate the system based on the final overall R-value?
 
(I would basically do this for each individual shell in the DD wizard, sheet 3).
 
Thank you!
 
Chris Baker
CCI CAD Drafter
 

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