Fiberglass batt insulation provides about how much R-value per inch?

Fiberglass batt insulation provides about how much R-value per inch?

• A. 3.0
• B. 4.0
• C. 2.0
• D. 5.0

Answer: (A)

R-value per inch shows how much heat flow resistance you get for each inch of insulation. For standard fiberglass batt insulation, the typical value is about R-3 per inch. That’s why the correct choice is the one close to 3.0. It means a given thickness adds roughly three units of resistance for every inch. For example, three inches gives about R-9, six inches about R-18, and so on. The other numbers don’t fit fiberglass batt’s usual performance; 2.0 per inch is lower than typical (often due to compression or poor installation), while 4.0 or 5.0 per inch are higher than what standard fiberglass batt generally provides—that level is more common with some higher-density foams. Remember that actual performance can vary with installation quality, moisture, and compression, but the per-inch rating for fiberglass batt centers around three.

R-value per inch shows how much heat flow resistance you get for each inch of insulation. For standard fiberglass batt insulation, the typical value is about R-3 per inch. That’s why the correct choice is the one close to 3.0. It means a given thickness adds roughly three units of resistance for every inch. For example, three inches gives about R-9, six inches about R-18, and so on. The other numbers don’t fit fiberglass batt’s usual performance; 2.0 per inch is lower than typical (often due to compression or poor installation), while 4.0 or 5.0 per inch are higher than what standard fiberglass batt generally provides—that level is more common with some higher-density foams. Remember that actual performance can vary with installation quality, moisture, and compression, but the per-inch rating for fiberglass batt centers around three.