Understanding R-Values – Tiger Foam Insulation, Fiberglass Insulation vs Spray Foam Insulation …
Understanding R-Values – Tiger Foam Insulation, 12/1/2018 · Closed-cell spray foam has a far better R-value per inch than other, less effective insulations like cellulose, fiberglass, or even open-cell foam. All these have R-values ranging from R-3.2 to R-3.8 per inch. The R-value of closed-cell foam is R-6.5-7 per inch. Contractors often use it to insulate under slabs, ceilings, walls, and roofs. It performs better than other insulation types.
7/24/2017 · Open-cell spray foam has an R-value of about R-3.7 per inch, while closed-cell spray foam has an R-value that may be as high as R-6.5 per inch. If you want to install spray foam in a stud wall, and price is no object, then it would seem to make sense to specify closed-cell spray foam, right?, Low Density or Open Cell Spray Foam. Medium Density or Closed Cell Spray Foam. Closed Cell Roofing Spray Foam. Thermal Performance: R-Value* Starting at 3.6 per inch. Starting at 5.7 per inch. Starting at 5.5 per inch. 2×4 Cavity: Full Fill: R13. R20. Not used for interior application. Air Barrier / Sealant ✓ ✓ ✓ Vapor Retarder: Class II rating ✓, Traditional insulation such as cellulose or fiberglass is not comparable to spray foam insulation in R-value as those insulation methods use R value of heat transfer. Open cell spray foam insulation is air impermeable and is applied with a minimum of 3.5? on average and can be used for attics, interior floors & walls and soundproofing.
What this means is that spray foam R value is equivalent to any other product’s R value in reality when the marketing mojo is removed. If you do a proper job of air sealing, there is NO difference in heat loss (or gain) between a given amount of spray foam and any other.
In 1970, the popular number for the R-value of one inch of urethane foam was 9.09 per inch. Using this value, we were putting an R of 1.25 x 9.09 = 11.36 in the walls. This was much less than the R = 16 claimed by fiberglass insulators.
Cost / sq. ft. per R value; Fiberglass batt: 13-30: $0.20-$1.00: $0.02-0.03: Loose fill such as fiberglass, cellulose & mineral wool (8-23 inches thick) 30-50: $0.45-$2.25: $0.03: Open cell polyurethane spray foam (3.5 inches thick) 12.6: $1.70-$2.50: $0.17: Closed cell polystyrene spray foam (1 inch thick) 6.5: $1.30-2.00: $0.25: Expanded …
2/5/2009 · For example, when testing spray polyurethane foam (SPF) for its R-value according to ASTM C-1029 (Standard Specification for Spray Applied Cellular Polyurethane Insulation) both ASTM C-518 and ASTM C177 require a 12”x 12” x 1” sample cut from a sprayed board of foam .
