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Empire Mountain Bigfoot 30 Synthetic Roofing Underlayment, 48 in. x 250 ft. Roll, Gray
Regular price $118.00Orders start at $399 — combine any items to reach the minimum. Learn more
Empire Mountain Bigfoot 30 Synthetic Roofing Underlayment, 48 in. x 250 ft. Roll, Gray
Bigfoot 30 is a mechanically attached, coated woven synthetic underlayment for sloped roofs, made to replace 15# and 30# felt. Each roll measures 48 in. x 250 ft. with a gray anti-slip top surface. It is 20 times stronger and 8 times lighter than 30# felt.
Key Features:
- 20x Stronger: Manufacturer rates it 20 times stronger than 30# felt for tough weather and tear resistance.
- 8x Lighter: Eight times lighter than 30# felt, making rolls easier to carry up to the roof.
- Anti-Slip Surface: Top surface has an added anti-slip coating to help protect against costly slips and falls.
- Superior Traction: The unique gray surface offers more friction and slip resistance than standard roofing felt.
- Felt Replacement: Specifically manufactured to replace 15# and 30# asphalt felt underlayment on sloped roofs.
- Coated Woven Build: A coated woven synthetic construction designed for mechanical attachment.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Empire Mountain |
| Sell unit | 1 roll, 48 in. x 250 ft. |
| Product line | Bigfoot 30 |
| Material | Coated woven synthetic underlayment |
| Color / finish | Gray |
| Nominal size | 48 in. x 250 ft. |
| Length | 250 ft. |
| Width | 48 in. |
| Coverage per unit | 1,000 sq. ft. per roll (nominal, before laps) |
| Available colors | Gray |
| Available sizes | 48 in. x 250 ft. |
| Intended use | Synthetic underlayment for sloped (residential) roofs |
Coverage & How Much You Need:
At 48 in. x 250 ft., a full roll provides about 1,000 sq. ft. of nominal coverage before laps; account for head laps and side laps per your local code and shingle manufacturer when sizing the job.
Fit and Compatibility:
Designed for use under shingle and other sloped roofing systems in place of 15# or 30# felt, with mechanical attachment; cap fasteners or nails per the shingle manufacturer's instructions. Not stated whether it carries approval for specific shingle system warranties, so confirm with the roofing manufacturer.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One roll of Bigfoot 30 synthetic underlayment measuring 48 in. x 250 ft.
Q: How much area does one roll cover?
A: Roughly 1,000 sq. ft. nominal at 48 in. wide by 250 ft. long; deduct for laps and waste when estimating.
Q: Does it replace 30# felt?
A: Yes, it is specifically manufactured to replace 15# and 30# felt and is rated 20 times stronger and 8 times lighter than 30# felt.
Q: Is it slippery to walk on?
A: The gray top surface has an added anti-slip coating that gives more traction and slip resistance than standard roofing felt.
Q: How is it attached?
A: It is a mechanically attached underlayment; follow your shingle manufacturer and local code for fastener type and spacing.
Q: How many rolls do I need?
A: Divide your roof area by about 1,000 sq. ft. per roll and add 10-15% for laps and waste.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
For steep-slope tear-offs, Bigfoot 30's light weight and high tear strength let a crew dry in faster and safer than with felt. Lap horizontal courses per code for the roof slope and always check the shingle manufacturer's underlayment requirements to preserve the warranty. In high-wind regions, tighten fastening density along eaves and rakes.
Even with an anti-slip coating, synthetic underlayment is not a fall-protection system; wear a harness on steep slopes and keep the surface clean and dry.
Add Empire Mountain Bigfoot 30 synthetic underlayment to your next re-roof for a lighter, stronger felt alternative.
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