Product Overview
The GAF Timberline HDZ is an architectural (dimensional) asphalt shingle that became the best-selling single shingle product in North America after its introduction. It replaced the earlier Timberline HD as GAF's flagship standard architectural shingle. The product is available in a wide range of colors and is installed by contractors from Florida to Alaska.
Key Specifications
| Specification | Detail |
|---|---|
| Product type | Architectural (dimensional) asphalt shingle |
| Wind rating | 130 mph (with proper installation) |
| Impact rating | Not Class 4 (see ArmorShield II for IR version) |
| Fire rating | Class A (with appropriate deck assembly) |
| Warranty (base) | Limited Lifetime (against manufacturing defects) |
| Coverage per bundle | Approximately 33.3 sq ft |
| Algae resistance | StainGuard Plus available on algae-resistant version |
Verify current specifications with GAF directly -- products update periodically.
How It Compares to Owens Corning Duration
- Both are standard architectural shingles at the same market tier
- Both carry 130 mph wind ratings with proper installation
- Both carry Limited Lifetime base warranties
- Installation process is similar -- most experienced shingle crews are comfortable with both
- Color availability varies -- view current samples for your area
- Warranty tier you can access depends on contractor certification, not the shingle itself
Related: GAF vs Owens Corning Comparison
Timberline HDZ vs Timberline ArmorShield II
If you are in a hail-prone region, ask your contractor specifically about the Timberline ArmorShield II -- the Class 4 impact-resistant version of the Timberline line. The ArmorShield II uses SBS-modified asphalt for better impact resistance and typically qualifies for insurance premium discounts in applicable states. The standard Timberline HDZ is not Class 4 rated. The upgrade cost from HDZ to ArmorShield II is typically modest in materials, often significantly less than the insurance discount will recover over time.
Frequently Asked Questions
What does HDZ stand for in GAF Timberline HDZ?
HDZ stands for High Definition Z -- representing the product's dimensional profile and enhanced adhesive strip design. The 'Z' refers to the StrikeZone nailing area, which is a wider-than-standard fastening zone that GAF introduced to reduce improper nailing and improve wind resistance. The wider strike zone accommodates the variance in nail placement across different installation speeds and conditions.
What wind speed is the Timberline HDZ rated for?
The GAF Timberline HDZ is rated for 130 mph wind resistance when properly installed. This requires 6 nails per shingle in certain high-wind conditions (rather than the standard 4 nails). Achieving the rated wind speed requires following the manufacturer's installation instructions, including proper nailing patterns and the use of starter strips at the eave and rake.
What warranty does the Timberline HDZ come with?
The Timberline HDZ carries a Limited Lifetime warranty against manufacturing defects when installed as the base product. For enhanced warranty coverage (System Plus, which adds non-prorated coverage periods and labor cost inclusion), installation by a GAF Certified Contractor is required. For the Golden Pledge warranty (the highest GAF tier, including wind and workmanship coverage), installation by a GAF Master Elite contractor is required.
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Product specifications and warranty terms change. Verify current specifications directly with GAF. This page is not affiliated with GAF.