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Insulation refit and balancing the insulation.

House located in zone 2A, off the ground ~ 2 feet (1800 sq ft). The house has a sloped metal roof with 2 x 6 rafters on 24 inch centers and 2 x 4 stud walls on 16 inch centers. Currently there is no insulation in the walls or floor and 5 1/2 inches of fiberglass on the attic floor.

Plans:
Attic Unvented (~R30) 5 1/2 inch fiberglass batt with 2 inches of rigid poly iso foam.
Walls (~R20) 3 1/2 inch fiberglass batt with 1 1/2 inches of rigid poly iso foam.
Floor (~(R13) 2 inches of closed cell foam.
Windows triple pane low e argon gas filled.

Is this a balanced insulation plan? I am looking for the most bang for my buck and was wondering if these insulation levels made sense together?

Asked by David McMillan
Posted Sat, 07/28/2012 - 05:31

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1 Answer

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David,
Most builders would probably argue that it's hard to justify the use of triple glazing in Climate Zone 2. Even Passivhaus builders have managed to meet the Passivhaus standard in Climate Zones 2 and 3 with just double glazing.

Answered by Martin Holladay, GBA Advisor
Posted Sat, 07/28/2012 - 09:03

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