GAF
How to install Timberline HDZ shingles
GAF's own installation overview for Timberline HDZ — the four-nail method, course layout, and the StrikeZone nailing area.
Learning Center
Understand the roof before you buy it.
Most roofing decisions are made on a single number. This is the rest of the information: what each material actually is, which manufacturer systems we build with, how each roof goes together, and where roofs fail.
8
Material families
3
Manufacturer systems
7
Install guides
21
Tutorial videos
Four ways in
Start wherever your question is
Every page here is written for a property owner, not a contractor. No jargon without a definition, and no claim we cannot show you on your own roof.
Materials
Roofing materials, compared honestly
Shingle, TPO, PVC, modified bitumen, standing seam, stone coated steel, tile, solar. What each one is good at, and the failure mode to expect.
Read moreManufacturers
The systems we build with
GAF for steep-slope assemblies, TRI-BUILT for the accessory layer, Westlake Royal for stone coated steel. What each brand covers and why it matters.
Read moreInstallation
How these roofs actually go on
Our step-by-step sequence for every system we install, from tear-off and deck prep through flashing and final walk.
Read moreAnatomy
Every part of a roof, named
Deck, underlayment, leak barrier, step flashing, drip edge, ridge vent. What each part does and how it fails.
Read moreManufacturers
The three systems behind our roofs
GAF
GAF Roofing Systems
A complete, manufacturer-matched steep-slope system — shingle to ridge vent.
Explore the system
TRI-BUILT
TRI-BUILT Materials
The accessory layer behind the roof: underlayments, edge metal, fasteners, ventilation.
Explore the system
Westlake Royal Roofing Solutions
Westlake Royal · Unified Steel
Stone-coated steel in shake, shingle, and Spanish tile profiles.
Explore the systemWatch it happen
Installation, filmed properly
Manufacturer and field tutorials for the systems we install. The full library covers every material we work with.
Westlake Royal / Unified Steel
How to install a stone coated steel roof
A job walkthrough of stone-coated steel panel installation, including panel layout, fastening, and hip and ridge trim.
14
Roof parts explained
A roof is fourteen or more separate components working as one assembly. Most of the leaks we open up are at the parts nobody sees — flashing, boots, terminations. The anatomy guide names every one of them, in the order water meets them.
See the anatomy guideGet Started
Have a specific question about your roof?
Tell us what you are looking at and we will explain what it is, why it happened, and what it takes to fix it.