Flat Roof Repair in Los Angeles, CA
Flat roof repair in Los Angeles, CA covers the low-slope roofs on additions, duplexes and small shops, where water has no steep slope to run off. A roofer finds the split seam, failed drain or worn patch, repairs it and says whether the membrane has years left. A flat roof that ponds water is checked for the drainage fault first, because a patch does not cure ponding.
Why flat roofs fail
Low-slope roofs hold water, so a small fault becomes a leak faster than on a pitched roof. Low slope roof repair starts with the usual faults: ponding where the roof sags, seams that have split, loose wall flashing and drains choked with debris. Membrane roofs also age: InterNACHI puts TPO at roughly 7 to 20 years, a wide range that depends on thickness and sun [thisoldhouse.com, updated 2026-04-07].
Membranes used on Los Angeles flat roofs
Common systems are TPO, modified bitumen and built-up roofs, each with different seams and repair methods. TPO, the single-ply membrane behind roofing tpo, one of the more searched flat-roof terms, is welded at the seams. Modified bitumen is torched or mopped down in layers. The roofer identifies the system first, because the repair has to match it.
Flat roof repair, coating or replacement
A localized split or failed flashing is a repair. A roof with good deck but a tired surface can sometimes take a coating. A roof with wet insulation or several failed areas is quoted for replacement. The estimate says which of the three applies and what each costs. HomeAdvisor's Los Angeles page puts the average flat roof repair at about $1,558, with a typical range of $629 to $2,568 [homeadvisor.com Los Angeles flat foam or single-ply repair, search summary 2026-11-07].
Commercial flat roofs
Shops and apartment blocks usually have flat roofs too, and the commercial roofing page covers those larger jobs. This page is for the house, the duplex and the addition.
Flat roof repair questions, answered
How do you fix a leaking flat roof?
The roofer finds the split seam, failed drain or lifted flashing, repairs it to match the membrane and checks that water now drains. A patch over ponding without fixing the low spot fails again.
How long does a flat roof last?
InterNACHI's range for TPO is about 7 to 20 years, and thickness and sun move it within that range. Modified bitumen and built-up roofs have their own ranges.
Can a flat roof be coated instead of replaced?
Sometimes, when the deck and insulation are dry and sound. The roofer checks for moisture before recommending it.