Torch Down Roof Replacement in Los Angeles, CA
At 10624 Ventura Blvd, Los Angeles, CA 91604, Roof Replacement Inc completed a full torch-down roof replacement on this commercial-style flat roof property. The scope covered complete tear-off of the failed existing roofing system, substrate preparation, and installation of a new modified bitumen membrane system using Polyglass underlayment and cap sheet. The finished roof presents a clean, uniform surface with properly sealed penetrations, treated parapet walls, and addressed skylight curbs throughout.
Photos from the project’s first day show the extent of deterioration the existing roof had reached: heavily rusted metal deck panels, failed and crumbling built-up roofing material, widespread rust scaling across the substrate, and complete breakdown of any remaining waterproofing layer. Several areas showed through-rusting on the metal deck, and the parapet wall bases exhibited significant corrosion. The condition of the old roof made full replacement the only viable path forward.
Project Gallery
Tear-Off and Substrate Assessment
The crew began by stripping the existing failed roofing membrane down to the metal deck substrate. Photos clearly show the scope of what was uncovered: pervasive orange rust across the metal panels, large areas where the old bituminous material had separated and crumbled away, and sections where the deck had corroded through. Workers swept and cleaned the exposed deck surface thoroughly before any new material was laid. Where the canopy sections over the front elevation were stripped, the underlying deck showed similarly advanced rust and deterioration.
Base Sheet Installation with Polyglass Underlayment
Once the substrate was clean and prepped, the team installed Polyglass base sheet across the entire field of the roof. The black base ply, clearly branded Polyglass by Mapei on the roll packaging visible in multiple photos, was laid in parallel courses with consistent overlap spacing marked directly on the material. This layer is visible across both the main roof field and the front canopy section, providing the bonded base for the cap sheet to follow. Propane torches and torch wands were used throughout the application process.
Cap Sheet Application and Penetration Detailing
Over the base sheet, the crew installed a white granule-surfaced Polyglass cap sheet, which is visible across the completed roof field in multiple progress and completion photos. The white granule surface provides both UV reflectivity and a finished wearing surface appropriate for a flat commercial-style roof in Southern California. Around roof penetrations including multiple plumbing vents, HVAC curbs, and pipe stacks, the membrane was carefully cut, fitted, and torch-welded to create watertight transitions. A white sealant or mastic compound was applied at parapet wall bases and along the corrugated metal parapet structure to seal the flashing termination points.
Skylight Curb Work and Follow-Up Detailing
The property had multiple skylights, including a large dome-style unit and a multi-light flat curb assembly. Follow-up photos dated January 2026 show the crew returning to address the flat skylight curb, where the old flashing had failed and separated. Workers removed the deteriorated flashing material from around the curb frame, re-prepped the curb base, and integrated new Polyglass membrane into the curb flashing. The dome skylight received mastic sealant at its aluminum frame perimeter as part of the same detailing process. A tape measure visible in one photo shows the crew actively verifying dimensions at the skylight frame.
Project Details
Roofing in Los Angeles, CA
Los Angeles sits in a climate zone characterized by intense UV radiation, prolonged dry seasons, and periodic heavy rainfall that follows long dry spells — a combination that is particularly hard on flat roof membranes. The region’s sun exposure degrades unprotected bituminous roofing relatively quickly, making reflective cap sheets a practical choice for flat and low-slope roofs throughout the area. While rainfall totals are modest compared to other U.S. cities, the intensity of winter rain events means that any breach in a flat roof membrane can lead to significant water intrusion in a short period.
Our Service Area: Los Angeles, CA
Frequently Asked Questions
Get a Roof Inspection in Los Angeles
If your flat or low-slope roof is showing signs of membrane failure, rust, or recurring leaks, Roof Replacement Inc serves Los Angeles and the surrounding area and can assess what your roof actually needs. Reach out to schedule an on-site inspection and get an honest evaluation of your roof’s condition.
Project Details
DATE
May 20, 2026
