Flat Roof Section Replacement on 1960s Oakland Ranch Home
The Challenge
A split-level Rockridge ranch home had a low-slope garage roof section that had been covered with three layers of built-up roofing over 60 years. The surface had multiple blisters, ponding water from improper drainage slope, and two known leak points over the attached garage. The existing drainage scuppers were undersized for Oakland rain events, regularly overflowing and sending water down the exterior wall.
Our Solution
We removed all three layers of built-up roofing down to the original plywood decking, replacing two sheets that were soft from moisture. The new system used a two-ply modified bitumen membrane (TPO overlay) with a white reflective surface for energy efficiency. We re-sloped the drip edge to eliminate the ponding area and installed larger 3-inch scuppers with internal overflow protection. All penetrations (HVAC lines, plumbing vents) received new pitch pans with pourable sealer.
The Result
First winter after installation confirmed zero leaks and no ponding water. The white reflective membrane surface also reduced the garage temperature by approximately 12°F in summer, a secondary benefit the homeowner appreciated. The modified bitumen system carries a 20-year manufacturer warranty.
Project Details
- Project Type
- Roof Replacement
- Location
- Rockridge, Oakland
- Duration
- 2 days
- Materials Used
- 2-ply modified bitumen, TPO overlay, aluminum scuppers
- Year Completed
- 2025
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