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How thick is r28 rigid insulation?

Updated: 10/5/2023
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11y ago

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From everything I have seen it would be about 12 inches for conventional fiber glass insulation available from Home Depot or Lowes.

Polyiso insulation can give up to r-6 per inch. That equates to 7 inches for r-42.

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13y ago
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14y ago

An R-value indicates an insulation'sresistance to heat flow. So, thickness will depend on the material used.

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11y ago

6 inches

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