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Prescriptive High Performance Attics §150.1
There are three options that may be used to comply:
Option A: Ducts and air handler may be located
in the attic
– Install attic radiant barrier (Zones 2-15)
– Install R-38 insulation at ceiling (R-30 in zones 3 & 5-7)
– Install continuous roof deck insulation (Zones 4 & 8-16)
- R-6 with air space above insulation/ R-8
with no space
Option B: Ducts and air handler may be located
in the attic
– Install attic radiant barrier (Zones 2,3 & 5-7)
– Install R-38 insulation at ceiling (R-30 in Zones 3 & 5-7)
– Install below roof deck insulation (at rafter)
(Zones 4 & 8-16)
- R-13 with air space above insulation/ R-18
with no space
Option C: Ducts and air handler must be located in conditioned space
– Install attic radiant barrier (Zones 2-15)
– Install R-38 insulation at ceiling (R-30 in Zones 3 & 5-7)
