Complete Flat Roof Upgrade by ROOF EXPRESS
Flat roofs in San Francisco face constant exposure to moisture, fog, UV rays, and temperature fluctuations. Over time, these conditions break down older roofing systems, leading to leaks, ponding water, and structural damage. At ROOF EXPRESS, we recently completed a full 3-ply torch-down roof replacement project, transforming a failing flat roof into a durable, waterproof system built to last.
This project highlights the importance of proper installation, high-quality materials, and experienced craftsmanship when dealing with flat roofing systems in the Bay Area.
Before: Failing Torch Down Roof System
The original roof had reached the end of its lifespan. Multiple layers of aged modified bitumen were deteriorating, with visible cracks, blisters, and soft spots throughout the surface. Water infiltration had already begun, and the decking underneath showed signs of damage.
Our inspection identified several key issues:
Advanced wear and tear from UV exposure
Poor drainage causing ponding water
Compromised seams and flashing points
Rotten and weakened plywood decking
Improper previous repairs
At this stage, a full roof replacement was the only reliable solution.
Scope of Work – Complete Flat Roof Replacement
ROOF EXPRESS performed a full tear-off and installation of a new 3-ply torch-down roofing system, following industry best practices and San Francisco building requirements.
The project included:
Full removal of existing roofing materials
Replacement of damaged plywood decking with 5/8” CDX exterior-grade sheets
Installation of new drip edge and metal flashings
Installation of proper ventilation components
Application of a high-performance 3-layer torch-down system
Reinforcement of all seams and penetrations
Waterproof sealing around vents, pipes, and edges
Every step was completed with precision to ensure long-term performance and compliance.
What Is a 3-Ply Torch Down Roofing System?
A 3-ply torch-down system is one of the most reliable flat roofing solutions for homes and buildings in San Francisco. It consists of three layers of modified bitumen applied using heat (torch method), creating a seamless, waterproof membrane.
Benefits of a 3-ply system:
Superior waterproof protection
High resistance to UV and weather damage
Long lifespan (20+ years with proper maintenance)
Excellent performance in foggy and rainy climates
Strong protection against leaks and ponding water
This system is especially ideal for San Francisco’s climate, where moisture control is critical.
After: Clean, Durable, and Long-Lasting Flat Roof
After completion, the roof was fully transformed into a smooth, uniform, and highly durable surface. All penetrations, skylights, and flashing areas were professionally sealed, ensuring complete waterproofing.
The new system provides:
Enhanced structural integrity
Improved drainage performance
Long-term leak protection
Increased property value
Peace of mind for the property owner
The clean finish and precise installation reflect the high standards maintained by ROOF EXPRESS on every project.
Why Choose ROOF EXPRESS for Flat Roofing in San Francisco
ROOF EXPRESS is a Diamond Certified roofing company serving San Francisco and the entire Bay Area. We specialize in flat roofing systems, including torch-down, TPO, and low-slope solutions.
What sets us apart:
Certified and highly experienced roofing crews
Use of premium materials (CertainTeed, Polyglass, GAF)
Full compliance with California building codes
Detailed inspections and transparent estimates
Manufacturer-backed warranties
Strong local reputation and customer satisfaction
We understand the unique roofing challenges in San Francisco and deliver solutions built specifically for this environment.
Get a Professional Flat Roof Inspection Today
If your flat roof is showing signs of aging, leaks, or damage, it’s important to act early before the problem becomes more costly.
ROOF EXPRESS offers professional inspections, detailed reports, and expert recommendations tailored to your property.
Call or text: (650) 666-5554
Visit: https://roof-ex.com
Schedule your inspection today and protect your property with a high-quality roofing system designed to last.
