Photo: GAFResidential Roofing
Full Roof Replacement Systems —
Backed by the Golden Pledge® Lifetime Limited Warranty on Qualifying Systems.
We don't install shingles. We install complete roofing systems designed to meet manufacturer warranty standards — competing on scope completeness, installation quality, communication, and warranty protection.
Get an instant budget estimate in about 60 seconds using aerial roof data — no appointment or sales call required.
Instant Roof Estimate
Precise aerial measurement data
Instant Roof Estimator
Enter your property address to generate a fast ballpark estimate using precise aerial measurements. No site visit required.
Instant Budget Estimate
Request a detailed written quote and we'll get back to you fast — no appointment or sales call required.
Request a Detailed QuoteThe instant result is a preliminary budget estimate based on available aerial data. Westmark confirms measurements, roof layers, pitch, access, decking conditions, permitting requirements, material selections, and other project details before issuing a detailed written proposal.
Fast estimate is a starting point. A precise quote follows after aerial review.
GAF Advanced Protection Technology
The Technology Built Into Every GAF Roof We Install
Every complete GAF system we install is engineered around GAF's Advanced Protection Technology™ — including GAF Dura Grip™ Advanced Sealant, plus LayerLock™ technology and the GAF WindProven™ Limited Wind Warranty on qualifying Timberline HDZ systems.
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Roofing Systems
Good, Better, Best
All three are complete systems — not just shingles. Choose based on your goals, your home, and how long you plan to stay.
Architectural Asphalt System
GAF Timberline HDZ
Warranty
GAF Golden Pledge included
The most installed shingle in North America. Advanced LayerLock technology delivers superior wind resistance and a clean, architectural look — installed as a complete GAF system with the GAF Golden Pledge included.
- Installed as a complete GAF roofing system
- LayerLock wind resistance technology
- Golden Pledge®: 50-yr non-prorated manufacturing-defect + 25-yr non-prorated workmanship periods
- Class A fire rated
- Available in 20+ colors
Warranty
GAF Golden Pledge Limited Warranty
Designer Asphalt System
GAF Grand Sequoia
Warranty
GAF Golden Pledge included
The visual upgrade. Deep, dimensional profile that replicates the look of natural cedar shake — installed as a complete GAF system with the same enhanced warranty as Timberline.
- Premium dimensional cedar shake profile
- Thicker, richer appearance than standard shingles
- Complete GAF system install
- Golden Pledge®: 50-yr non-prorated manufacturing-defect + 30-yr non-prorated workmanship periods
- Class A fire rated
Warranty
GAF Golden Pledge Limited Warranty
Premium Synthetic System (DaVinci)
DaVinci Select Shake / Province Slate
Warranty
Limited Lifetime Material Warranty
Permanent performance. DaVinci tiles replicate the look of natural slate and cedar — without any of the maintenance, moisture issues, or fire risk.
- Class A fire + Class 4 impact rating
- Zero rot, mold, or moisture absorption
- UV-stable color that won't fade or streak
- Installed to DaVinci specifications
- DaVinci Limited Lifetime Material Warranty
Warranty
DaVinci Limited Lifetime Material Warranty
Warranty eligibility subject to project qualification and manufacturer program terms. Ask for details in your quote.
Have a Tile Roof?
Tile Lift & Relay
For qualifying concrete and clay tile roofs, we also offer tile lift-and-relay — carefully removing your existing tiles, replacing the underlayment and flashings beneath them, and reinstalling the suitable tiles.
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Complete GAF System
A Complete System — Not Just Shingles.
GAF's Lifetime Roofing System is six engineered layers working together. To qualify for the Golden Pledge warranty, every component has to come from GAF and be installed to GAF's published specification. A complete GAF system installed to GAF manufacturer specification is the only way Westmark installs.
The Six Components
Every layer matters. Skip one and the warranty's gone.
- 1Leak Barrier. Self-adhered membrane at eaves, valleys, and penetrations.
- 2Roof Deck Protection. Synthetic underlayment over the entire deck.
- 3Starter Strip Shingles. Pre-cut starter for proper sealing at the eave.
- 4Lifetime Shingles. Timberline HDZ or Grand Sequoia, installed to spec.
- 5Attic Ventilation. Balanced intake and exhaust to protect from inside.
- 6Ridge Cap Shingles. Matched ridge cap completes the system.
Installed to GAF specification
Genuine GAF Timberline shingles, fastened to manufacturer pattern.
The full system underneath
GAF Tiger Paw underlayment and Pro-Start strips before shingles go on.
A finished GAF Timberline system.
Dimensional shadow lines and color depth — qualifying GAF systems we install are eligible for the GAF Golden Pledge®: Lifetime limited manufacturing-defect and workmanship coverage, subject to GAF's complete warranty terms.
Scope of Work
What's Included in Every Project
We don't install shingles on top of a compromised system. Every Westmark project includes a complete replacement — full tear-off, deck inspection, system installation, and cleanup. No components skipped. No exceptions.
Full Tear-Off
Complete removal of the existing roof down to the deck — no installing over an old system.
Deck Inspection (Every Job)
Every square foot inspected. Damaged or deteriorated sheathing replaced before anything goes back down.
Synthetic Underlayment
Modern synthetic underlayment — stronger, lighter, and more tear-resistant than felt.
Leak Barriers at Critical Areas
Self-adhered ice-and-water shield at eaves, valleys, and around all roof penetrations.
New Metal Flashings
Drip edge, step flashing, and pipe flashings replaced new — no reusing damaged flashings.
Ridge Ventilation System
Balanced intake and exhaust ventilation built into every project — protects the system from the inside.
Manufacturer-Spec Installation
Every component installed to the spec required for an enhanced manufacturer warranty.
Full Site Cleanup
Magnetic nail sweep, debris hauled away, job site left cleaner than we found it.
Included in standard project scope. Additional structural repairs (if uncovered during deck inspection) are quoted separately and approved by you before any work proceeds.
How We Install
Our Install Process. Zero Shortcuts.
The same process applies to every project — GAF or DaVinci. No steps skipped, no components cut.
Tear-Off and Deck Inspection
We remove the old roof system to the deck. Every square foot is inspected. Damaged or deteriorated sheathing is replaced before anything goes down.
Deck Prep and Underlayment
The deck is prepped and synthetic underlayment is installed. Leak barriers are applied at eaves, valleys, and all vulnerable areas per manufacturer requirements.
Flashings and Waterproofing
All pipe flashings, drip edge, and transition flashings are replaced new. Vulnerable areas are waterproofed to manufacturer specification.
Ventilation and Ridge System
Intake and exhaust ventilation are balanced to protect the system from the inside. Ridge components are installed per system requirements.
Final Installation + Walk-Through
The selected product — GAF shingles or DaVinci tiles — is installed to manufacturer specifications and local building code. Final walk-through with you confirms everything is right.
Warranties Explained
Material vs. System vs. Workmanship
Three different things. Most homeowners don't know the difference until something goes wrong. Here's the simple version.
Material Warranty
Covers
The shingle product itself if it fails on its own
Doesn't cover
Installation mistakes, workmanship, or system components
Who provides it
Manufacturer (GAF or DaVinci)
System Warranty
Covers
The complete roofing system — not just the shingles
Doesn't cover
Issues from non-system components or non-spec installs
Who provides it
Manufacturer — only available on complete-system installs to manufacturer spec
Workmanship
Covers
Installation labor — how the roof was put on
Doesn't cover
Material defects (those go through the material warranty)
Who provides it
Either the contractor OR the manufacturer (with enhanced warranties)
GAF Golden Pledge Limited Warranty
Available on qualifying GAF system projects
- Lifetime limited manufacturing-defect coverage on qualifying GAF components — non-prorated for the first 50 years
- Tear-off and disposal included when necessary for an approved covered claim
- Lifetime limited workmanship term — non-prorated for 25 years (Timberline HDZ / HDZ RS) or 30 years (eligible designer shingles, including Grand Sequoia)
- Full system protection — not just the shingles
- Available on a complete GAF system installed to GAF manufacturer specification
Subject to project qualification and GAF program terms.
DaVinci Limited Lifetime Material Warranty
DaVinci system projects
- Limited Lifetime Material Warranty from DaVinci manufacturer
- Installed to DaVinci's specifications
- Class A fire and Class 4 impact ratings maintained
- No rot, mold, or moisture — little to no maintenance required
Subject to DaVinci manufacturer terms and program eligibility.
Replace Your Roof — Done Right the First Time.
Written quotes, not verbal ranges. Full-system installs, not shortcuts. No pushy sales tactics.
Get an instant budget estimate in about 60 seconds using aerial roof data — no appointment or sales call required.
Related
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Roof Replacement Overview
What's actually included in a Westmark replacement.
Asphalt Shingle Systems
Complete GAF systems with the Golden Pledge.
DaVinci Synthetic Systems
Premium synthetic shake + slate.
Warranty
GAF Golden Pledge + DaVinci Limited Lifetime Material.
Roof Replacement in San Diego
Coastal-grade systems for SD homes.
Roof Replacement in Irvine
HOA-friendly OC system installs.