| UL Design Number |
FIRM-FILL® Underlayment Thickness |
Number of Hours |
Subfloor |
Joists |
Resilient or Furring Channels |
Gypsum Board |
Batts & Blankets |
| J917 |
1/2-1" |
2 |
Precast Concrete |
|
|
|
|
| J919 |
3/4" |
2-4 |
Precast Concrete |
|
|
|
|
| J920 |
3/4" |
2-3 |
Precast Concrete |
|
|
|
|
| J924 |
1/2" - 3/4" |
2-4 |
Precast Concrete |
|
|
|
|
| J927 |
3/4" |
2 |
Precast Concrete |
|
|
|
|
| J931 |
1/2" |
2-3 |
Precast Concrete |
|
|
|
|
| J957 |
1/2" |
2-4 |
Precast Concrete |
|
|
|
|
| J991 |
1/2-1" |
1-4 |
Precast Concrete |
|
|
|
|
| J994 |
1/2-1" |
2 |
Precast Concrete |
|
|
|
|