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

Chris Baker CBaker at cci-alliance.com
Thu May 1 19:22:42 PDT 2014

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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