Sharkskin

Sharkskin makes synthetic roof underlayments that actually work in Montana conditions. A Montana builder reported their Sharkskin Ultra® withstood 18 months on the Continental Divide at 6,000 feet elevation — temperatures from -25°F to +95°F, 13 cumulative feet of snow, and 55mph wind gusts — without damage or water infiltration. That’s the kind of real-world testing that matters more than any lab certification.

Made by Kirsch Building Products, Sharkskin specializes in premium synthetic underlayments for pitched roofs, creating a secondary barrier under roofing material in case of loss from high winds or damage. They’re not trying to be everything to everyone — just the best underlayment option for contractors who understand that what goes under the shingles matters as much as what goes on top.

The Sharkskin Product Line

The company builds four distinct underlayment systems, each targeting specific roofing challenges:

Sharkskin Ultra® — The flagship. 50-year warranty, 12-month UV resistance, designed for metal, tile, slate, and battened roofs. Engineered polypropylene construction handles temperatures from -40°F to 280°F while maintaining a gray color that keeps buildings cooler. Features patented Shark Grip™ technology for slip resistance and the highest tensile strength of any nail-able polymer steep-pitched underlayment.

Sharkskin Ultra SA® — Self-adhered for ice dam protection. Developed in 2006, this high-temp rated peel-and-stick combines the heavy Sharkskin Ultra® substrate with aggressive adhesive coating technology, creating an “All Weather Barrier” engineered as secondary water protection against hurricanes, tornadoes, hail, and winter ice dams. The 48-inch wide rolls mean fewer rolls to comply with ice barrier codes, and it sticks in cold weather down to 10°F.

Sharkskin Ultra Radiant® — Combines roofing protection with radiant barrier properties to enhance energy efficiency. Smart choice for Montana’s temperature swings where summer heat gain matters as much as winter protection.

Sharkskin Comp® — The budget-conscious option for asphalt shingle and metal roofing with 6 months UV exposure and 25-year warranty. Still features high tensile strength and non-slip surface, just scaled back UV resistance for less demanding applications.

Why Montana Contractors Choose Sharkskin

The numbers tell the story. Here’s what matters for Montana’s climate:

Specification	Sharkskin Ultra®	Why It Matters
Temperature Range	-40°F to 280°F	Handles Montana’s -30°F winters and hot metal roofs
UV Exposure Rating	12 months	Covers delays through multiple seasons
Warranty	50 years	Matches quality roofing systems
Cold Weather Adhesion (SA version)	Down to 10°F	Actually sticks during Montana installation season
Width (SA version)	48 inches	Meets ice barrier codes with fewer rolls

Unlike traditional felt that expands, contracts, and wrinkles from temperature changes and moisture, Sharkskin Ultra® stays stable and won’t scar or melt. That Montana builder’s 18-month exposure test proves what the specs promise — this stuff handles real weather extremes.

The self-adhered Ultra SA® version eliminates the need for mestics while providing hurricane-grade protection. It can be installed over different substrates in freezing weather, which matters when you’re racing to dry-in before the next storm.

Target Market and Professional Focus

Sharkskin positions itself clearly: “Designed by roofers for the roofing industry.” This isn’t homeowner-grade material repackaged for pros. They focus on professional roofers and roofing contractors, particularly those working with demanding applications like metal roofing where temperature extremes really test an underlayment.

The products work across residential and commercial applications, covering everything from asphalt shingles to cedar shake, metal, slate, concrete/clay tile, and ventilated roof systems. Roofers in Hawaii specifically love the Ultra SA underlayment — and if it handles tropical UV and storms, Montana’s weather won’t phase it.

All products are VOC-free, recyclable, and made in the USA. The sustainability angle isn’t just marketing — they explicitly connect green building to being “economical as well as ecological,” understanding that durability is the ultimate environmental benefit.

Skip Sharkskin if you’re looking for the cheapest option or doing a quick patch job. These products cost more upfront because they’re engineered for contractors who can’t afford callbacks. When you’re building in Montana’s freeze-thaw cycles, UV exposure at elevation, and potential 50+ mph winds, the premium pays for itself in avoided warranty claims.

Frequently Asked Questions

Q: How long can Sharkskin underlayment stay exposed to UV before covering with roofing?

Sharkskin Ultra® and Sharkskin Ultra SA® can remain exposed to UV for up to 12 months without degradation, while Sharkskin Comp® provides 6 months of UV resistance. This extended exposure rating gives contractors flexibility for project delays through Montana’s unpredictable weather seasons.

Q: What temperature range can Sharkskin underlayment handle?

Sharkskin Ultra® performs in temperatures from -40°F to 280°F, making it suitable for Montana’s extreme cold winters and hot summer metal roofs. The self-adhered Sharkskin Ultra SA® version will stick to surfaces in temperatures down to 10°F, allowing cold-weather installation.

Q: What’s the difference between Sharkskin Ultra and Sharkskin Ultra SA?

Sharkskin Ultra® is a mechanically fastened (nailed) synthetic underlayment, while Sharkskin Ultra SA® is self-adhered with peel-and-stick technology that eliminates the need for mastics. Both offer 50-year warranties and 12-month UV resistance, but the SA version comes in 48-inch wide rolls specifically for ice barrier applications.

Q: What roofing applications work with Sharkskin products?

Sharkskin underlayments work under asphalt shingles, cedar shake, metal roofing, slate, concrete/clay tile, and ventilated roof systems. Sharkskin Comp® is specifically designed for asphalt shingle and metal roofing, while Sharkskin Ultra® handles the more demanding tile, slate, and battened roof applications.

Q: How does Sharkskin compare to traditional felt paper in extreme weather?

Unlike felt paper that expands, contracts, and wrinkles from temperature changes and moisture, Sharkskin Ultra® maintains stability across its full temperature range and won’t scar or melt. A Montana builder reported Sharkskin Ultra® survived 18 months at 6,000 feet elevation through -25°F to +95°F temperatures, 13 feet of cumulative snow, and 55mph winds without damage or water infiltration.

Q: What makes Sharkskin Ultra Radiant different from standard Sharkskin products?

Sharkskin Ultra Radiant® combines standard underlayment protection with radiant barrier technology to reduce heat gain and improve energy efficiency. This dual function makes it particularly valuable for Montana buildings where both winter protection and summer cooling matter.