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.
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.
R-38
What is the r value of water 2 feet thick
10 inches corresponds to about R-38.
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.
A bundle of R-38 insulation typically covers about 1,000 to 1,200 square feet, depending on the specific product and manufacturer. The coverage can vary based on the thickness and type of insulation (e.g., fiberglass batts or rolls). Always check the packaging for precise coverage details.
The recommended R-value for ceiling insulation in a residential setting is typically between R-38 and R-60 to ensure optimal energy efficiency and comfort.
R-48 insulation typically measures around 12 to 16 inches in thickness, depending on the material used (such as fiberglass or cellulose) and the specific product design. The R-value indicates its thermal resistance, with R-48 providing significant insulation for attics and roofs in colder climates. Always refer to manufacturer specifications for exact dimensions, as they can vary.
about 9 1/2 inches thick
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.
Every insulation has a different R value. It ultimately is determined by which insulation you will be using. Now lets do rough estimate. 4" thick, regular fiberglass mat has R-value of 13. Assuming that plywood has the same to half the insulating value of fiberglass, 1/2" plywood would have 1/8 to 1/16 of R-value of that 4" mat. Roughly R-1.6 to R-0.8
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