Roofing underlayment, engineered
Keep every roof dry from the deck up.
Gear & Build synthetic underlayments and self-adhered membranes give professional roofers a stronger, faster, longer-lasting moisture barrier — with the traction, UV tolerance, and warranty a serious crew depends on.
Built for the way you work
Every roll is manufactured to a single standard — the one that lets a crew move fast without ever giving back watertightness.
Watertight, guaranteed
A continuous synthetic barrier with sealed laps and fastener zones that shed water on any pitch.
Up to 180-day UV exposure
Stage the deck early and dry-in with confidence — the surface holds up to months of sun before cover.
Walkable traction
An engineered walking surface keeps crews sure-footed in dew, frost, and steep-slope conditions.
Flat-rate & Free Shipping
Single skid ships at a flat rate. Two skids and up ship free. For 5+ skids, contact us for a custom quote.
Explore
Everything a roofing pro needs, in one place
From the catalog to the loading dock, Gear & Build keeps specification, pricing, and support close at hand.
- Roofing underlaymentSynthetic underlayment for metal roofing, asphalt shingles, steep slopes, and more.Go
- Shop the catalogSynthetic underlayment, self-adhered membranes, and roofing accessories.Go
- Technical documentsSpec sheets, installation guides, warranties, and SDS in one library.Go
- Talk to our teamQuestions about specs, stock, or freight? We are glad to help.Go