WindProven Limited Wind Warranty has no maximum wind-speed cap when installed with four qualifying GAF accessories. ASTM D3161 Class F.
Hail / impact
Class 3
UL 2218 Impact-Resistance Test rating. Class 4 is the highest grade; some Florida insurers offer a small discount on hail-rated roofs.
Fire rating
Class A
ASTM E108 / UL 790
Weight per square
240 lbs
Standard architectural asphalt
Algae resistance
StainGuard Plus
25-year algae warranty
Manufacturer
GAF
Parsippany, NJ · made in the USA
Pieces / square
64
Coverage: 100 sq ft per square
Exposure
5 5/8"
Manufacturer-specified shingle exposure per course
What you're looking at.
The granule tones the blend is built from, how the colour is classified, and how it behaves on a roof.
Granule 01Base tone#878C89
Granule 02Lighter granule#A0A4A1
Granule 03Deeper granule#5A5E5C
Hex
#878C89
Family
Gray
Undertone
Cool blue
Best in
Daylight
How it shifts
Designers reach for Birchwood when they want a roof that disappears into 'looks correct' rather than competing for attention. It is balanced, slightly cool, and difficult to pair badly. On a Florida house with bright sun and white stucco, it is one of the safest specifications you can write.
The profile
GAF uses a tight blend of dark gray and faint blue-gray granules to keep the surface visually alive. The result is a roof that reads as a clean architectural line from the street and a textured surface up close.
Where it belongs
A safe specification if you have not committed to a final paint color yet. It cools the rest of the elevation visually and makes warm accents (cedar, stone, copper) look richer.
Timberline HDZ Birchwood, shown two ways: photographs from manufacturers and Florida roofers, and renders that keep the roof color from an install photo and restyle the facade around it. Every image below says which it is.
Manufacturer install
AI-rendered example (aerial view)
AI-rendered example (street view)
AI-rendered example (dusk view)
Birchwood pairs well with.
We do not yet have full-render combination pages for this color family.
Upload a phone photo of your house and watch our AI swap your existing roof for GAF Timberline HDZ Birchwood in about four seconds. Save the render, share with your contractor, change your mind ten times. Free.
About Birchwood.
Questions homeowners ask before they commit. Answered without sales spin.
A confident, slightly cool dark gray. It reads close to black in shade and as a clean slate in direct sunlight. The granule blend has a faint cool undertone that keeps it from looking flat. On a Florida elevation with strong overhead light, expect the surface to brighten visibly compared to a cloudy day.
Minimally. GAF's ceramic granule coating is engineered to hold color for 25 plus years in Florida UV. Expect a barely-visible shift toward a slightly warmer tone over the first 5 years, then stability. The full warranty covers premature fading. Source: GAF product warranty card and NRCA Asphalt Shingle Manual.
In direct overhead sun it brightens to a clear charcoal with visible dimensional shadow lines. On cloudy days it reads almost black and recedes visually, which flatters most siding colors underneath. At sunset the granule blend shows its warmth.
Slightly, compared to a white or light-gray roof. In Florida, a mid-dark roof adds approximately 5 to 10 degrees Fahrenheit to attic temperatures during peak summer. Proper attic ventilation and a modern radiant barrier reduce the actual cooling-load impact to less than 20 dollars per month in most homes.
Very similar in daylight. The gray-family SKUs across GAF, GAF, CertainTeed, IKO, and Owens Corning sit within a small tonal window. Subtle differences in granule blend (some lean cool blue, others lean warm slate) become visible only side by side. Use the Compare tab to see direct hex deltas.
Generally yes. GAF's algae-resistance package uses copper- or zinc-infused granules that inhibit the most common Florida algae strain (Gloeocapsa magma). Expect clean performance for the warranty window with normal cleaning; in heavy-shade or low-airflow installations occasional soft-wash maintenance helps. Source: NRCA Algae Discoloration field guidance.
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See Birchwood on your house before you commit to it.
#878C89 · gray · cool blue undertone 
