GAF roofing. Start with the system.

Start with the Timberline product line

A proposal that says only GAF leaves important decisions open. Timberline HDZ is an architectural asphalt shingle with LayerLock technology and the StrikeZone nailing area. The current HDZ product has a UL 2218 Class 3 impact rating. Timberline UHDZ with UltraMat and Timberline AS II offer Class 4 options; AS II uses SBS-modified asphalt. These are different products, so request the exact name and current specification sheet.

For a Seattle home, begin with the roof itself: its slopes, tree cover, attic arrangement, and any low-slope additions. Ask the estimator to explain which materials belong on each section. An architectural shingle selected for the main roof does not automatically answer how a porch transition, skylight, or nearly flat addition should be waterproofed.

Understand the complete assembly

GAF's WindProven limited wind warranty is available on eligible systems and has no maximum wind-speed limit, subject to its terms. Eligibility depends on qualifying shingles and four accessory categories, including specified starter, deck protection, ridge caps, and either leak barrier or attic ventilation. It is conditional warranty coverage, not a prediction that a roof cannot suffer storm damage.

Use the estimate to make the assembly visible. It should identify the underlayment, leak protection, edge details, starter, ridge products, and ventilation work. Ask how the installer will handle existing flashing and what happens if damaged decking is uncovered. Those answers make the proposal more useful than an isolated shingle price.

• Name the shingle and accessory products in writing.
• Separate included work from allowances for hidden decking damage.
• Request a plan for roof-to-wall transitions, penetrations, and ventilation.

Algae coverage and warranty choices

Qualifying HDZ and AS II products carry GAF's 25-year StainGuard Plus algae limited warranty. Check the product label and exclusions. An algae warranty should not be read as a promise against moss, debris buildup, or every kind of roof staining.

GAF offers standard and enhanced warranties with different coverage and contractor requirements. Ask for the actual warranty proposed, the installer's current eligibility, and who registers the roof. Manufacturer defect coverage and protection for installation errors are separate questions. A limited lifetime warranty also does not establish the number of years your roof will last.

Compare the installed price

There is no single GAF price for every Seattle property. Request a base proposal and a separately priced product upgrade with the same tear-off, flashing, ventilation, and disposal scope. This makes it easier to decide whether a different appearance, impact classification, or warranty package is worth the additional investment for your home.

View physical color samples outdoors and ask about current local availability before committing. Keep a copy of the final scope, product labels, warranty paperwork, and registration confirmation with your home records.