With my studs 3.5" wide, R15 would be the deepest fiberglass I could fit between the studs. So, for me UltraTouch is more economical and the density appears better than R13 and equal to R15. ![]() R15 fiberglass (Johns Manville) runs ~0.89/sq ft for R15. Therefore, if one can find R15 it might be the best choice of the three (R13 UltraTouch, R13 pink fluffy, or R15 pink fluffy). Identical to R15 fiberglass insulation, but nearly double R13. Now, multiply the lbs/ft2 by 3.43 should give us lbs/ft3 (pounds per cubic foot) ![]() determine how many times 3.5" fits into 1' or 12"). Product thickness is a nominal 3.5", so we can determine if we took 12"/3.5" we would get the number of square feet of product we would have to stack on top of one another to derive a cubic foot of product (i.e. Here is the calculation that I used (if it's wrong, someone please correct me): However, using the data from one of their brochures (found here), if my math is correct it is ~1.4pcf. I could not locate density data in Bonded Logic's literature for their standard denim insulation (UltraTouch). Regardless, I'm in the same boat right now as the OP - debating which insulation type to use - and if my calculations are correct, UltraTouch denim insulation's density is ~2x the density of R13 fiberglass (pink fluffy) and equal to R15 fiberglass density.Īccording to NIST (reference here), R13 fiberglass has a density of 0.76pcf and R15 has a density of 1.41pcf. I'm going to presume its mass is a portion of insulation's contribution to sound dampening since other comments in this thread reference insulation density. Click to expand.Lab tests with and without insulation between the studs consistently indicate 'with insulation' tests perform better.
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