Trusted Commercial Re-Roofing Solutions for Simi Valley Businesses
Call us today for a FREE ESTIMATE!
YEARS OF EXPERIENCE AS ONE OF THE MOST RELIABLE Commercial ROOFING COMPANIES IN SIMI VALLEY, CA
For large industrial and retail properties, including those along Cochran Street or Los Angeles Avenue, we provide high-performance commercial re-roofing solutions. All new commercial installations in Simi Valley must comply with California Title 24 Energy Standards, which require “cool roofing” systems with high solar reflectance and thermal emittance to reduce energy costs. We specialize in Fluid-applied Acrylic, SA Cap, and Silicone roof membranes that are factory-fabricated to resist the heavy wind loads and thermal expansion typical of the Simi Valley climate.
Commercial Project Tip: While many minor repairs under 100 square feet do not require a permit in Simi Valley, a full commercial re-roofing project involves a multi-stage inspection process with the city. We handle the entire permitting and inspection workflow to ensure your building meets current safety and Title 24 energy codes. You can view the full
We conduct our Simi Valley Roofing business in a manner that elevates how roofing contractors are perceived by individual homeowners and commercial clientele alike. Customer service is paramount at GreatWay Roofing Company.
GreatWay Roofing
4518 Industrial St
Simi Valley, CA 93063
(805) 523-2550
Commercial Roof Systems: The Right Choice for Your Building
We specialize in restorative and replacement systems that excel in the Simi Valley corridor:
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Fluid-applied Acrylic: This is a highly reflective, “cool roof” solution that is often used on steep-slope metal roofs or to extend the life of existing membranes. It provides a seamless, monolithic layer that reduces thermal expansion and lowers energy costs.
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Silicone Roof Membranes: Ideal for flat roofs, silicone is moisture-cure and highly resistant to ponding water. It creates a durable, weather-tight seal that stands up to Simi Valley’s intense UV exposure.
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SA Cap (Self-Adhered): A multi-ply system that provides traditional asphalt durability without the need for hot kettles or open flames, making it a safer and cleaner option for retail and office environments.
Signs Your Commercial Building Needs a New Roof
Catching these signs early prevents damage to inventory and interior assets:
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Persistent Membrane Blisters: Bubbling in the roof surface suggests trapped moisture or air, leading to eventual leaks.
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Separated Seams: Failed joints are the most common entry point for water in flat roofs.
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Interior Moisture or Mold: If you see water tracking down walls or equipment, the roof’s integrity is likely compromised.
Click here to return to our main Simi Valley Roofing Services hub.
Need a quote for damage? See our Simi Valley Commercial Roof Repairs page.
Ask about an ongoing contract with our Commercial Inspection & Maintenance plans in Simi Valley.
CALL US TODAY FOR A FREE, NO-OBLIGATION ESTIMATE!
MINIMUM ROOFING REQUIREMENTS
Listed here is a breakdown of the minimum roofing requirements based upon the most common existing roof coverings for Simi Valley.
Categories:
Asphalt Shingle:
Tile:
Low Slope:
# of Layers
Max layers = 2
Max layers = 1
No addl. layers permitted
Added layers may require Engineer’s Report
Plywood
Use existing
Replace as needed
Use existing
Replace as needed
Use existing
Replace as needed
Min. Felt
Underlayment*
ASTM D226 Type I 15#)
30# recommended
ASTM D226 Type II (30#)
40# recommended
Not Applicable
Min. Fire
Rating
Class A Min.
Class A Min.
Class B Min.
Recommended Class A
Color Restrictions
**No Restrictions**
**No Restrictions**
**No Restrictions**
Max. Weight
**6lbs. Per sq. ft. Over 6lbs. Requires Engineer’s Report**
**6lbs. Per sq. ft. Over 6lbs. Requires Engineer’s Report**
**6lbs. Per sq. ft. Over 6lbs. Requires Engineer’s Report**
*Roofs with a slope of less than 4:12 require a minimum of 2 layers of a 15lb. ASTM D226 Type I felt underlayment.
REVIEWS
WHAT OUR CLIENTS ARE SAYING
Tim and Brandon sent updates at every step including pictures of their work in real time.
We are very pleased and have contracted them for another property.
Highly recommend.
The price was great (as much as it can be for a roof, no small purchase), and the crew was really fantastic. They were professional and got the work done quickly. They had to put sheathing on my roof, since it’s old and didn’t have any underneath (!), and the whole project still only took 4 days.
For me, the best thing was that the crew cleaned up every day. The yard was clear, and there were no nails or debris hanging around. It’s a little thing that was really nice to see— it was really nice to go outside in the afternoon and not worry about stepping on anything/ having that peace to move around in the middle of a project.
I’d recommend this company to anyone.
This company is a class act and I am so pleased to have picked GreatWay Roofing who kept me informed thru email and sent photos as the project was moving ahead.
Great customer service, knowledgeable courteous workers and a satisfied customer says it all
