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      Timberline® AS II Specs

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      What are UL 2218 Class 4 Impact-Resistant shingles?

      Timberline® AS II Shingles are made with our proprietary SBS-modified asphalt formulation and pass UL’s toughest impact-resistance test — UL 2218 Class 4¹. That means they can really take a punch from Mother Nature.


      ¹Timberline® AS II Shingles are not warranted to withstand hail damage.

      UL 2218 Class 4 Impact-Resistance Test

      A 2” steel ball is dropped twice from a 20-foot height onto various target locations

      to evaluate the shingles’ ability to withstand the impact.

      How do impact-resistant shingles work?

      SBS polymer–modified asphalt technology helps protect your home from the elements. Polymer modification makes asphalt more durable, rubber-like, and super-flexible — to help reduce stress when impacted. When this material is used to make roofing shingles, it results in a shingle with excellent flexibility and durability, plus increased impact resistance.

      Local code requirements

      Always check local codes to see what’s required in your area. 

      Potential insurance savings

      Shingles that pass the UL 2218 Class 4 Impact-Resistance Test may qualify for insurance discounts.1 Be sure to ask your insurance company about discounts that may be available when you install UL 2218 Class 4 Impact-Resistance shingles.

      Timberline® AS II — the UL2218, Class 4 impact resistant shingle¹ that can also help protect your roof from wind, and algae discoloration.

      The technologies incorporated into Timberline® AS II shingles are the keys to unlocking both the 15-Year WindProven™ Limited Wind Warranty² and the 25-Year StainGuard Plus™ Algae Protection Limited Warranty³. See details below.


      ¹Timberline® AS II Shingles are not warranted to withstand hail damage.

      WindProven™ Limited Wind Warranty2

      Only one shingle qualifies for WindProven™ — the industry’s first wind warranty with no maximum wind speed limitation. Just install GAF Shingles with LayerLock™ Technology, such as Timberline® AS II Shingles, plus four required GAF accessory products.
      215-year WindProven limited wind warranty on Timberline® AS II Shingles requires the use of GAF starter strips, roof deck protection, ridge cap shingles, and leak barrier or attic ventilation. See GAF Roofing System Limited Warranty for complete coverage and restrictions Visit gaf.com/LRS for qualifying GAF products.

      25-Year StainGuard Plus™ Algae Protection Limited Warranty1

      Timberline® AS II Shingles come with a 25-year StainGuard Plus Algae Protection Limited Warranty1 against blue-green algae discoloration, and proprietary time-release technology that releases algae-fighting copper steadily, over time, for long-lasting algae fighting power.
      325-year StainGuard Plus Algae Protection Limited Warranty against blue-green algae discoloration is available only on products sold in packages bearing the StainGuard Plus logo. See GAF Shingle & Accessory Limited Warranty for complete coverage and restrictions and qualifying products.
      Lifetime refers to the length of warranty coverage provided and means as long as the original individual owner(s) of a single-family detached residence [or eligible second owner(s)] owns the property where the qualifying GAF products are installed. For other owners/structures, Lifetime coverage is not applicable. Lifetime coverage on shingles requires the use of GAF Lifetime Shingles only. See the GAF Shingle & Accessory Limited Warranty for complete coverage and restrictions. Visit gaf.com/LRS for qualifying GAF products. Lifetime coverage on shingles and accessories requires the use of any GAF Lifetime Shingle and at least 3 qualifying GAF Accessories. See the GAF Roofing System Limited Warranty for complete coverage and restrictions. For installations not eligible for the GAF Roofing System Limited Warranty, see the GAF Shingle & Accessory Limited Warranty.Visit gaf.com/LRS for qualifying GAF products.

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