Q: What is the density of Johns Manville's building insulation?
A: Johns Manville produces its thermal fiber glass building insulation (BI) to a specific R-value and thickness rather than a specific density. The density may fluctuate during production in order to achieve the designed R-value at the specified thickness. However, these approximate densities may be used for design purposes. Only the Insul-SHIELD® product line is produced to a specific thickness and density.
|
Approximate Densities of BI |
|
R-Value |
Thickness |
Avg. Density (pcf) |
|
R-38
R-38c
R-30
R-30c |
13"
10 1/4"
10 1/4"
8 1/4" |
0.5
0.8
0.5
0.8 |
|
R-26
R-25
R-22
R-21 |
8 3/4"
8 1/4"
7 1/2"
5 1/2" |
0.5
0.5
0.5
0.9 |
|
R-19
R-19
R-15
R-13
R-11 |
6 1/2"
6 1/4"
3 1/2"
3 1/2"
3 1/2" |
0.5
0.5
1.5
0.8
0.5 |
|
Specialty Products |
|
Product |
Density (pcf) |
|
Microlite L
Poly Iso Foam |
0.7 (post lamination)
2 |
