Climate zone — insulation + attic: code vs good practice

Code: sets the numbers. Good practice: meet code.

Attic — insulation + attic: code vs good practice

Code: R-30 to R-60 by zone. Good practice: more.

Code: R-13 to R-20 + ci by zone. Good practice: meet code.

Code: R-13 to R-38 by zone. Good practice: meet code.

Code: U-0.30 to U-0.50 by zone. Good practice: lower.

Code: tested. Good practice: meet code.

Structure · Chapter 33

Insulation slows heat; air sealing stops drafts. Together they decide comfort and bills more than the furnace does.

2021 IECC R402 insulationIECC climate zone mapIRC R806 attic ventilationMaker specs

33.1

Different materials fit different places. Mixing them is normal.

Seal the air first, then insulate.

The rest of Insulation + attic: 1 more spread, 6 drawings and 6 code citations, plus every other chapter, is part of the full fieldbook.

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