Insulation requirements in South Dakota
Short answer
South Dakota spans climate zones 5, 6. For most of the state (zone 6), the DOE recommends about R60 of attic insulation, with more in its colder areas.
Climate zones
5, 6
Most of the state
Zone 6
Recommended R-values for South Dakota
Based on zone 6, which covers most of South Dakota. Colder parts of the state (higher zones) need more — enter your ZIP for your exact numbers.
| Area | Recommended R-value | Blown fiberglass |
|---|---|---|
| Attic / ceiling | R60 | 24.0" |
| Exterior walls | R20–R30 | 12.0" |
| Floors | R30 | 12.0" |
| Crawlspace / basement wall | R15–R19 | 7.6" |
South Dakotarebates & tax credits
The federal 25C tax credit (30% of insulation materials, up to $1,200/yr) applies everywhere. South Dakota's IRA rebate programs are administered by the state and rolling out on their own timeline. Check the official finder for South Dakota's current status and how to apply.
Find South Dakota's rebate programs →Last verified 2026-07-07.
Your exact numbers
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Frequently asked questions
How much insulation do I need in South Dakota?
South Dakota is in IECC climate zones 5, 6. For most of the state the DOE recommends about R60 in the attic, with more in colder areas. Enter your ZIP for the exact zone.
Are there insulation rebates or tax credits in South Dakota?
Yes — the federal 25C tax credit covers 30% of insulation materials (up to $1,200/year), and South Dakota's IRA HOMES/HEAR rebate programs (up to $1,600 for insulation) are administered by the state. Check the official finder for current South Dakota status.
What climate zone is South Dakota in?
South Dakota spans IECC climate zones 5, 6; most of the state is zone 6. Your exact zone depends on your county — enter your ZIP to check.