Commercial roofing —
TPO, flat roof & metal systems.
Your building keeps your business running. A failing roof threatens everything inside it. Grandmark installs and repairs commercial roofing systems across all 5 California markets — scheduled around your business hours.
$30,000–$75,000 roof. $0 today.
Zero % interest · 10-year special PGE financing. Most business qualify because of our team,s experience.
$30,000 replacement
$250/month · 120 months · 0% APR
$75,000 replacement
$625/month · 120 months · 0% APR
A leaking commercial roof isn’t just a maintenance problem — it’s a business liability
Business owners who delay commercial roof repairs don’t just face a bigger repair bill. They face:
- Inventory, equipment, and product damaged by water intrusion
- Tenant complaints and potential lease violations
- OSHA exposure if employees are working in a compromised structure
- Insurance claim complications when pre-existing damage is discovered
- Lost productivity every time rain forces a shutdown or workaround
Four reasons California business owners choose Grandmark for commercial roofing
TPO flat roof specialists
TPO is the dominant flat roofing system across California commercial buildings. Our crews are specifically trained on TPO seam welding, membrane installation, and penetration detailing to manufacturer specification.
Zero business downtime
Early morning starts, weekend crews, phased installations — whatever keeps your business running. We don’t shut down your parking lot on a Monday morning. We plan around your calendar.
OSHA compliant on every job
Full fall protection, safety planning, and documented OSHA compliance on every commercial job. If a contractor gets hurt on your roof without proper protocols, the exposure follows you. We protect you from that risk.
Licensed, bonded & insured
CSLB #1030917. General liability, workers’ comp, and commercial contractor bonding on every project. You get certificates of insurance before we start — not after you ask three times.
We replace your roof right. Or we come back and fix it at no charge.
Every replacement includes our workmanship guarantee plus the GAF system warranty. If there’s a workmanship issue after installation — we come back. No argument. No invoice. Backed by the most comprehensive warranty in residential roofing.
OUR GUARANTEE
If we diagnose your commercial roof repair and fix it, and the same problem comes back — we make it right at no charge. We stand behind every repair we complete. Not because we have to. Because we want you to call us back when it’s time for a full replacement.
— Grandmark Roofing
This guarantee applies to all commercial roof repairs across all 5 California markets — TPO, flat roof, metal, and every system we service.
We don’t patch symptoms. We fix causes. When you repair the right thing the right way, the problem stays fixed.
Grandmark did an amazing job fixing our Roof and Duct work we needed done. Greatly appreciate them and recommend them 10/10 ! Thank you for everything making our home look great
Adrian Espinoza
Fresno, CA
They not only did everything they said they would do in the estimate, they went above and beyond with the repairs on the roof and came out on NEW YEARS DAY to do the job!
I would highly recommend GRAND MARK ROOFING to anyone looking for any type of roofing needs!
Steve larson
Sacramento, CA
David provided me with an estimate & video of tile roof issue. Although Grandmark Service Co. cannot do a small section repair that I need David did a good job of explaining the situation.
Nancy Silva
Bakersfield, CA
Commercial Roofing Services — Installation, Repair & Maintenance
TPO Roofing
TPO is energy-efficient, reflective, and the industry standard for California commercial buildings. We install single-ply TPO membrane systems on new construction and replacement projects, and repair existing TPO systems including seam failures, punctures, and flashing issues.
Flat & Low-Slope Roof Repair
Active leaks, ponding water, membrane blistering, seam separation, and drain failures. We diagnose and repair all flat roofing systems — TPO, PVC, EPDM, modified bitumen, built-up, and foam systems.
Commercial Roof Replacement
Full tear-off and replacement of existing commercial roofing systems. We assess your existing deck, insulation, and drainage before specifying the right replacement system. No upselling — we recommend what your building actually needs.
Metal Roofing
Standing seam and corrugated metal systems for commercial and industrial buildings. 50+ year lifespan. Ideal for warehouses, agricultural facilities, and modern commercial architecture in California’s fire-risk zones.
PVC Roofing
Chemical-resistant, weld-able PVC membrane for commercial applications requiring superior resistance to oils, grease, and industrial chemicals. Common in restaurant and food service facilities.
Commercial Roof Inspections
Annual and pre-purchase commercial roof inspections with full video documentation, written condition report, and maintenance recommendations. Essential before any commercial property acquisition or lease renewal..
Preventive Maintenance Programs
Scheduled maintenance visits that extend roof life, identify issues before they become failures, and keep your warranty valid. Documented service records for every visit.
Metal Roofing
24/7 emergency response for active commercial roof failures. We dispatch from 5 California offices — most markets receive same-day emergency service. Temporary weatherproofing available while permanent repairs are planned.
How a Commercial Roofing Project Works With Grandmark
Free Commercial Inspection & Video Assessment
We inspect your entire roofing system — membrane condition, seams, penetrations, drainage, and deck integrity. Everything is documented on video. You receive the footage.
Written Scope & Proposal
Detailed, itemized proposal covering scope of work, materials, system specifications, warranty terms, timeline, and total cost. We specify the exact products being installed — no vague line items.
Scheduling Around Your Business
Same-day approval in most cases. We handle the paperwork — you just sign and we schedule.
Permitting (If Required)
We handle permit applications for commercial work requiring local building department approval. You don’t chase paperwork.
installation
OSHA-compliant crew executes the work to spec. Site is secured, protected, and cleaned at end of each work period. You’re updated throughout.
Final Inspection & Warranty Documentation
Post-installation inspection, video walkthrough of the completed system, and written warranty documentation. GAF system warranty registered on your behalf where applicable
FAQ
Frequently asked questions
Everything California business owners ask before replacing their roof — answered honestly, without the sales pitch.
Your building deserves the same standard as the business inside it.
A commercial roof failure builds quietly — failed seams, slow membrane degradation, compromised drainage — until the next rain makes it impossible to ignore. Don’t wait for that moment.