Woven polypropylene underlayment built as a direct replacement for asphalt felt — higher tear strength, a walkable anti-skid surface, and UV stability measured in months rather than days.
Woven polypropylene underlayment engineered as a modern replacement for asphalt felt. High tear strength, anti-skid surface and UV-stable for up to 12 months of exposure.
Figures below reflect standard supply. Specifications are confirmed per order with test reports.
| Property | RL-140 | RL-180 | RL-250 |
|---|---|---|---|
| Weight (g/m²) | 140 | 180 | 250 |
| Standard roll size | 48" × 250' | 48" × 250' | 48" × 250' |
| Coverage per roll | 1,000 sq ft (10 squares) | 1,000 sq ft (10 squares) | 1,000 sq ft (10 squares) |
| UV exposure rating | 6 months | 12 months | 12 months |
| ASTM D8257 | Type II | Type II | Type III |
| Custom printing | Available | Available | Available |
| Typical MOQ | 1 pallet (56 rolls) | 1 pallet (56 rolls) | 1 pallet (56 rolls) |
Weight, width, roll length, core size and private-label printing can all be adjusted to your market requirements.
Typical placements we supply for. If your assembly is not listed, send us the detail drawing and we will confirm the right grade.
Primary underlayment under asphalt shingles on new builds and re-roofs.
Fast dry-in over large deck areas where tear strength and walkability matter.
A stable secondary layer beneath mechanically fixed roof systems.
Anti-skid surface and fastener-holding strength support demanding wind zones.
Entry weight for jobs that are shingled quickly and see limited open exposure (6 months UV).
The volume workhorse — 12 months UV exposure with the standard 48" × 250' roll format (1,000 sq ft).
Heavy-duty grade at Type III, supplied on 48" × 250' rolls (1,000 sq ft) for demanding decks and long exposure.
Always follow the roof or wall system manufacturer's instructions and the applicable local building code.
Qualifying questions worth putting to any mill supplying this product type. Get the answers in writing and compare them side by side.
Weight, roll size, core and private-label printing can all be built to your market. Tell us the specification and we will quote against it.
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