OC Duration Slatestone Gray delivers 130 MPH wind resistance through its patented SureNail® woven fabric strip — a measurable advantage for Montana contractors dealing with chinook winds and mountain gusts. The Class 3 impact rating (both UL 2218 and FM 4473 certified) provides documented protection against hail damage, potentially qualifying homeowners for insurance discounts. At 71.25 pounds per bundle with 32.8 square feet of coverage, crews handle a reasonable weight-to-coverage ratio while getting proven cold-weather performance from Owens Corning’s Tru-Bond® cold-climate sealant strip.
SureNail® Technology Performance
The patented SureNail® Technology centers on a tough-engineered woven fabric strip embedded in the nailing zone. This isn’t marketing fluff — it’s a structural component that changes how shingles hold fasteners. The Triple Layer Protection® creates a fabric overlay specifically for superior fastener holding power, addressing the single biggest failure point in high-wind roofing: nail pull-through.
Installation flexibility matters on Montana jobsites — Duration accepts 4 nails for standard installation or 6 nails for high-wind applications. The woven strip provides a wider sweet spot for nail placement compared to traditional shingle designs. Contractors report this translates to fewer jobsite failures and higher nail pull-through resistance compared to competitor products that rely on standard nailing strips.
| Specification | Value |
|---|---|
| Nominal Size | 13-1/4” x 39-3/8” |
| Exposure | 5-5/8” |
| Bundles per Square | 3 |
| Coverage per Bundle | 32.8 sq ft |
| Weight per Bundle | 71.25 lbs |
Wind and Impact Resistance
The 130 MPH wind warranty exceeds Montana’s most demanding wind corridors. The ASTM D3161 Class F and ASTM D7158 Class H certifications represent the highest ratings available. For context, Class H certification requires shingles to withstand 150 MPH winds in testing, providing a substantial safety margin above the warranty rating.
The Class 3 impact rating from both UL 2218 and FM 4473 puts Duration in the second-highest impact category. Class 3 means the shingles survived impacts from 1.75-inch steel balls dropped from 17 feet — simulating large hailstones. Class 4 exists, but Class 3 provides the sweet spot of protection and cost for most Montana applications. Insurance companies recognize these ratings, with many offering premium reductions for Class 3 or higher roofing.
Cold-Weather Installation
Owens Corning formulated the Tru-Bond® sealant specifically for cold-climate installation. Standard shingle sealants become brittle and won’t activate properly below 40°F. The cold-climate formulation maintains flexibility at lower temperatures, critical when Montana’s construction season pushes into late fall.
Each bundle weighs 71.25 pounds — manageable for crews working on steep pitches or hauling bundles up ladders. The 32.8 square feet per bundle coverage means contractors can calculate loads accurately without the guesswork that comes with non-standard bundle sizes.
System Requirements
Duration isn’t a standalone product — it requires specific components for warranty compliance. Owens Corning mandates ProArmor® or DeckDefense® underlayment beneath the shingles. For ice dam protection, only WeatherLock® G ice and water barrier maintains system compatibility.
The hip and ridge requirement is non-negotiable: ProEdge® in matching Slatestone Gray. Using generic ridge caps voids the warranty. Full warranty coverage requires using matching Hip & Ridge products — a detail that catches some contractors off-guard during the bidding phase.
Frequently Asked Questions
What makes SureNail® different from regular nailing strips? SureNail® uses a patented tough-engineered woven fabric strip embedded in the nailing zone, creating Triple Layer Protection® specifically for superior fastener holding power. The woven fabric provides measurably better nail retention than standard reinforced strips.
Can these shingles handle Montana hail? The UL 2218 and FM 4473 Class 3 impact ratings protect against hailstones up to 1.75 inches. Many insurance companies offer premium discounts for Class 3-rated roofing.
What’s the actual wind rating? 130 MPH limited wind warranty with both ASTM D3161 Class F and ASTM D7158 Class H certifications. The Class H certification means the shingles tested to 150 MPH, providing a safety margin above the warranty rating.
Do I need special underlayment? Yes. Owens Corning requires ProArmor® or DeckDefense® underlayment and WeatherLock® G ice barrier for system compatibility. Generic underlayments void the warranty.
How much does a bundle cover? Each bundle covers 32.8 square feet, with 3 bundles needed per square (98.4 sq ft coverage).
What about algae resistance? Duration includes StreakGuard® algae resistance technology with a 25-year warranty against black streaks. The copper-infused granules prevent algae growth in humid environments.
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