Thermal resistance: thickness divided by conductivity. Higher R means less heat loss.

How much attic insulation do I need?

US DOE recommends R-38 to R-60 in most climate zones for attics.

Fiberglass or spray foam?

Fiberglass costs less per R; spray foam also seals air leaks. Compare with the calculator.

Where does a house lose most heat?

Through the roof, windows, air leaks and uninsulated walls.

How much does attic insulation save?

It can cut heating and cooling costs noticeably — attics are usually the biggest loss.

Are there incentives?

Federal tax credits and utility rebates often apply to insulation and air sealing.

Insulation: calculate and quote

Attic and ceiling insulation, spray foam, pipe insulation and radiant barrier, with thickness from the R-value.

Calculators

Pipe insulation calculator
Pipe insulation lengths, sizes and tape.
Radiant barrier calculator
Rolls of radiant barrier, tape and staples.
Spray foam yield calculator
Volume, board feet, kits and R-value.

How is insulation thickness worked out?

Thickness comes from the target thermal resistance and the material's conductivity: thickness = R × λ. With area and product size you get rolls, boards or kits. Energy codes set minimum R-values by climate zone.

To compare products, look at λ (or R per inch): lower λ means thinner insulation for the same R.

Which insulation should I choose?

Fiberglass and mineral wool are cheap and good for sound and fire; spray foam seals air leaks and gives more R per inch; rigid boards (XPS, polyiso) handle loads and moisture. Radiant barriers complement, not replace, insulation.

On pipes, insulation prevents heat loss and condensation.

What reduces insulation performance?

Compressing batts, leaving gaps and unsealed joints, ignoring thermal bridges and skipping a vapor retarder where needed. Patchy insulation performs far below its rating.

Air sealing matters as much as thickness.

Prices & Guides

FAQs

What is R-value?: Thermal resistance: thickness divided by conductivity. Higher R means less heat loss.
How much attic insulation do I need?: US DOE recommends R-38 to R-60 in most climate zones for attics.
Fiberglass or spray foam?: Fiberglass costs less per R; spray foam also seals air leaks. Compare with the calculator.
Where does a house lose most heat?: Through the roof, windows, air leaks and uninsulated walls.
How much does attic insulation save?: It can cut heating and cooling costs noticeably — attics are usually the biggest loss.
Are there incentives?: Federal tax credits and utility rebates often apply to insulation and air sealing.

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