GAF and CertainTeed together account for roughly 60% of the residential shingle market in Georgia. Here’s the honest comparison.
Brand Overview
GAF is the largest roofing manufacturer in North America. Their Timberline series is the best-selling shingle line in the country. GAF’s warranty program (Golden Pledge) ties to certified installer networks.
CertainTeed is owned by Saint-Gobain. Their Landmark series competes directly with Timberline. CertainTeed is known for their SureStart PLUS warranty and slightly more premium aesthetic positioning.
Product Comparison: Mid-Range Architectural
| Factor | GAF Timberline HDZ | CertainTeed Landmark | |——–|——————-|———————| | Weight | ~250 lbs/square | ~240 lbs/square | | Wind rating | 130 mph | 110 mph standard | | Impact class | Class 3 standard | Class 3 standard | | Algae warranty | 25 years (StainGuard+) | 25 years (StreakFighter) | | Material warranty | Lifetime | Lifetime |
Both are excellent products. The differences are meaningful but not dramatic at this tier.
Class 4 Options
GAF Timberline HDZ RS — rubberized polymer layer for Class 4 impact resistance. Strong performer in Georgia’s storm market.
CertainTeed Landmark IR — also Class 4, comparable performance. Slightly more premium look in certain color options.
Both earn meaningful insurance discounts from major Georgia carriers.
Color and Aesthetic
CertainTeed’s Landmark line tends to have more color variation and shadow texture — looks slightly more like wood shake. GAF Timberline has a cleaner, more uniform appearance. Personal preference matters most here.
Warranties: What Actually Matters
GAF’s WindProven warranty (unlimited wind speed with qualifying installation) is a genuine differentiator on Timberline HDZ — no competitor matches it.
CertainTeed’s SureStart PLUS provides 50% coverage for the first 10 years — stronger early protection.
Both require installation by certified contractors for enhanced warranty provisions. Ask if your contractor is certified before signing.
The Honest Answer
Neither brand is clearly superior. If your contractor is GAF-certified, get GAF. If they’re CertainTeed-certified, get CertainTeed. Installation quality matters more than brand.
At Atlanta Roofing Experts, we’re certified with multiple manufacturers and recommend based on your specific situation. Get a quote →