VB-25 Synthetic Roofing Underlayment
Company: Van Boxel
Code Compliance Research Reports: CCRR-0471
VB-25 underlayment is a mechanically attached, four-layered synthetic roofing underlayment comprised of a non-woven fabric on the exposed side, a polymeric laminate/bonding layer, a woven polypropylene base, and a polymeric laminate/coating layer on the sheathing side. Its nominal weight is 2.05 pounds per 100 square feet and standard roll size measures 4 feet wide by 250 feet long, or as required. It is also available in different colors as required.
PHYSICAL RATINGS
| PRODUCT |
TEST METHOD |
TEST PROCEDURE |
RESULTS |
| VB-25 Roofing Underlayment |
ASTM D226 |
Unrollability |
Meets Type II |
| Breaking Strength |
Meets Type II |
| Pliability |
Meets Type II |
| Loss on Heating |
Meets Type II |
| CAN/CSA A123.3 |
Unrollability |
Meets Type III |
| Breaking Strength |
Meets Type III |
| Pliability |
Meets Type III |
| Loss on Heating |
Meets Type III |
| Water Shower Exposure |
Meets Type III |
FIRE CLASSIFICATION
CLASS A Assemblies
| ASSEMBLY NO. |
E108-RFU-69761 |
| Slope: |
2:12 (min.) |
| Deck Type: |
Combustible |
| Details: |
- Minimum nominal 3/8 in. thick code compliant exterior grade plywood
- Single layer of VB-25 underlayment mechanically fastened to the plywood every 12 in. oc using 1 in. cap nails. Underlayment horizontal joints overlapped by 4 in.
- Asphalt shingles Listed per ASTM D3462 with a minimum weight of 190 pounds per 100 square feet installed per manufacturer's installation instructions.
|
CODE COMPLIANCE RESEARCH REPORT
| EVALUATION METHOD |
BUILDING CODE |
CCRR NUMBER |
ASTM D8257
ICC-ES AC188 |
2024, 2021, 2018 IBC
2024, 2021, 2018 IRC
2023 FBC |
CCRR-0471 |
FLORIDA PRODUCT APPROVAL
| Report No. |
Product Covered |
| FL No. 41798 |
VB-25 Synthetic Roofing Underlayment |
