A roof is only as good as the materials that go into it. Even flawless installation work can't make up for low-grade or mismatched materials, which show up later as early wear, reduced durability, and other performance issues down the line. Cornerstone Roofing Solutions works directly with established roofing material manufacturers to bring professional-grade products across a full range of roofing systems to contractors and property owners throughout Bolinas, CA. That covers everything needed for a brand-new roof install as well as targeted repair work. Our supply team helps you track down the right materials for whatever you're working on, whether that's a full new roofing project from the ground up or matching materials to an existing roof, like replacing shingles on a house that's been standing for years.

Material Categories We Carry

🏠

Shingles and Surface Material

Surface roofing products for both residential and commercial jobs across every major category.

  • 3-Tab asphalt shingles
  • Architectural laminated shingles
  • Impact-resistant rated shingles
  • Designer and luxury shingle profiles
  • Wood shake and synthetic alternatives
⚖

Metal Roofing Products

Metal panels and related hardware built for both residential and commercial roofing.

  • Standing seam panels
  • Exposed fastener corrugated panels
  • Metal shingle systems
  • Trim and edge profiles
  • Metal roofing fasteners and sealants
💧

Underlayment and Barriers

The secondary waterproofing layer that shields the roof deck beneath the main surface material.

  • Synthetic underlayment
  • Felt (15 and 30 lb) underlayment
  • Self-adhering ice and water barriers
  • High-temperature underlayments
  • Vapor retarder products
🔨

Flashing and Accessories

The metalwork, penetration hardware, and finishing pieces that make a roofing system fully weathertight.

  • Step, counter, and base flashing
  • Drip edge and gravel stop
  • Pipe boots and pitch pans
  • Ridge vent and intake products
  • Roofing nails and fastener systems

Who We Work With

🔧

Roofing Contractors

Roofing pros who need a dependable source for quality materials, particular manufacturer lines, and specialty items for both residential and commercial jobs.

🏠

Homeowners

Property owners handling repairs or planning a project who want professional-grade materials along with guidance on specs, quantities, and compatibility.

🏛

General Contractors

GCs running new construction or renovation work who'd rather have roofing material sourcing handled by someone who knows roofing inside and out.

🏢

Property Managers

Commercial and residential property managers keeping supply on hand for ongoing maintenance or sourcing materials for a specific repair job somewhere in their portfolio.

Why Source Through Cornerstone

🔍

Real Material Expertise

We know roofing systems from the ground up. We'll help you pick materials that are properly specified for your job, compatible with what's already in place, and suited to the conditions your roof deals with here in Bolinas, CA.

📋

Accurate Quantity Takeoffs

Order too little and your project stalls; order too much and you've wasted money. We run takeoffs and quantity estimates off your plans or measurements so you order exactly what the job calls for.

🌟

Access to Professional-Grade Product

We source from manufacturers building to professional installation standards, not consumer-grade lookalikes that underperform down the road. Our supplier relationships come from years of hands-on project experience.

🔄

Compatibility Checks

Pairing the wrong products together, like an underlayment not rated for the application or flashing made from metal that reacts badly with what's next to it, can undermine an entire roofing system. We check compatibility across everything in your order.

Roof Supply Questions

Can you help match new material to my existing roof?▼
Matching materials is one of the trickiest requests we get, and also one of the most common. Shingle manufacturers change their lineups often, discontinue colors, and tweak formulas over time, which can make matching a roof that's a few years old genuinely difficult or, in some cases, impossible. We take a structured approach: we identify the manufacturer and product line from an existing sample or label when we can get one, check what's currently available for the closest match, and if the original product's been discontinued, we help you find the nearest alternative in color, profile, and texture. We're upfront about how close a match is realistically achievable so you know what you're getting before you buy.
How do I figure out how much roofing material I need?▼
Roofing materials are usually sold by the square, meaning 100 square feet of roof surface. To work out what you need, measure the total area of each roof plane, add those figures together, divide by 100 to get your square count, then build in a waste factor to cover cuts, overlaps, and starter courses. That waste factor usually runs 10 to 15 percent on a simple roof and can climb to 20 percent or more on a complex one with multiple hips, valleys, and penetrations. Underlayment gets calculated the same way. Flashing needs depend on the linear footage of your valleys, eaves, rakes, and penetrations. Our supply team runs a takeoff specific to your project so you get an accurate quantity before placing an order.
Do you supply both residential and commercial jobs?▼
We do. Our supply range covers the full spectrum of residential and commercial roofing needs. On the residential side, that means asphalt shingles from standard 3-tab up through premium designer profiles, along with the underlayment, ice and water barrier, flashing, and accessories that go with them. On the commercial side, we carry flat and low-slope membrane materials like TPO, EPDM, and modified bitumen, plus commercial metal roofing and the drainage products and accessories that come with larger projects. For bigger commercial jobs, we can coordinate phased deliveries to match your installation schedule and cut down on how much material you need to store on-site.