🏢 Commercial Flat Roofing

Expert Installation, Repair & Replacement of Flat Roofing Systems—Engineered for Performance, Built with Transparency.

Durable Flat Roofing with Reporting That Brings the Roof to You.

We deliver a level of communication and reporting that makes you feel like you’re there on-site. From photos to detailed project updates, you’ll always know exactly what’s happening above your building, every step of the way.

✅ Free Flat Roof Consultation
✅ Certified Flat Roofing Installers
✅ Detailed Photo Reports & Progress Updates
✅ Full Warranty on Materials & Labor

Our Promise: We bring the roof to you with perfect reporting—so you’re never left guessing about quality, progress, or next steps.

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Our Commercial Roofing Services

See All Roofing Services

Your Commercial Roofing Experts

★★★★★

Grandmark replaced the roof on our shopping center flawlessly—on time, within budget, and no tenant complaints.

★★★★★

The team handled a 50,000 sq ft replacement fast and professionally. I’d hire them again in a heartbeat

★★★★★

Our experience was wonderful. David was professional and provided great insight to the situation with our insurance company. He was on time and efficient. We appreciate his honesty and willingness to work with us! We will use this service again!

★★★★★

I had a wonderful experience working with Grandmark Roofing Company. From beginning to end, everyone I spoke to was kind and helpful. The communication was excellent!! Moises Ortiz and his crew were absolutely wonderful to work with. They were on time, did a thorough job and were meticulous with their clean up. It’s refreshing working with people who care about the customer and enjoy what they do. Thank you Moises and crew!

🔍 Our Commercial Flat Roofing Services

Flat Roof Installation
TPO, PVC, EPDM, and Built-Up Roofing systems installed with real-time reporting and photo documentation.
Flat Roof Replacement
Upgrade your aging roof with a modern, energy-efficient system—delivered with step-by-step reports so you stay in control.
Flat Roof Repair
We fix leaks, membrane damage, and ponding water issues, providing before-and-after visuals and repair logs.
Flat Roof Coatings & Restoration
Extend your roof’s lifespan with coatings, backed by transparent condition reports and warranty documentation.
Routine Flat Roof Maintenance & Inspections
We provide detailed inspection reports with photos and recommendations to keep you ahead of costly issues.

Why Businesses Chose Grandmark

✅ Certified Commercial Flat Roofing Specialists
✅ We Bring the Roof to You with Detailed Reporting
✅ Transparency Through Photos, Logs, & Updates
✅ Expertise Across TPO, PVC, EPDM & BUR Systems
✅ Minimal Disruption to Business Operations
✅ Full Warranty on Labor & Materials
✅ 5-Star Reputation Across California.

📞 See What’s Happening On Your Roof—Without Climbing a Ladder

Choose Grandmark Roofing Team for transparent, durable, energy-efficient commercial flat roofing—backed by reporting that puts you in control. Request a free consultation or bid today.