Right Start UDL Underlayment is a roofing underlayment consisting of inorganic fiberglass mat saturated with SBS modified asphalt and coated with sand. Right Start UDL underlayment sheet materials are available in rolls 39-3/8 inches (1000 mm) wide and 66 feet (20.12 m) long. Each roll of the underlayment weighs a minimum of 70 pounds (31.8 kg).
RATINGS
The Class A assembly is based on the following installation:
Class A: 5:12 slope
Combustible Construction
- 3/8-inch plywood sheathing
- 1 layer of Right Start UDL mechanically fastened to the sheathing
- Class A asphalt shingles mechanically fastened
FLORIDA PRODUCT APPROVAL
| Product |
Product Approval No. |
| Malarkey Roof Underlayments (non-HVHZ) |
FL No. 14807 |
| Malarkey Roof Underlayments (HVHZ) |
FL No. 15214 |
