Modified bitumen is forgiving on low-slope residential decks and on the small flat sections that so many valley homes have over a patio or addition. That is the short case for torch down modified bitumen, and on most Sunland streets it holds up. The longer answer depends on your framing, your slope, your budget and how long you intend to own the house.
How long it actually lasts
A correctly installed torch down modified bitumen roof in this climate runs 15 to 25 years. That range is wide because installation quality and ventilation move it more than the brand on the bundle does. We have pulled off ten-year-old roofs that were finished and thirty-year-old roofs with plenty of life left in them.
The cap sheet is torch-applied: the installer melts the underside as they roll it out so it fuses to the base. Done well it is monolithic. Done in a hurry it traps air.
What it costs in this area
Installed, expect $5.50 to $9.50 per square foot in the Sunland area, including tear-off and disposal. Steep pitch, multiple stories, complex rooflines and unexpected deck repair all move that number up. A simple gable on a single story sits at the low end of the range; a cut-up hip roof with six penetrations does not.
The line item homeowners are most often surprised by is decking. Nobody can see the condition of the plywood until the old roof is off, so an honest estimate states a per-sheet price up front rather than discovering it mid-job.
Where it fails
Blistering and seam lift are the usual complaints, and both trace back to moisture trapped under the cap sheet at install.
What to specify
Two-ply is the standard worth having. A single-ply torch application over a bad substrate is a short-term answer.
What we check on an inspection
- Field condition across every slope, not just the one visible from the street
- Flashing at every wall, chimney, curb and pipe penetration
- Valley condition and the offset of the courses running into it
- Eave and rake details, drip edge, and the first course seal
- Attic-side decking and the balance of intake to exhaust ventilation
Questions we get asked
Can I put torch down modified bitumen over my existing roof?
Sometimes, and it is usually a false economy. A recover hides the decking, adds dead load, and shortens the life of the new layer because it cannot lie flat over an uneven substrate. Los Angeles also limits total roofing layers.
How long does the job take?
A straightforward single-story residential roof is typically two to four working days. Tile and metal run longer. Weather, deck repair and inspection scheduling are the usual variables.
Does torch down modified bitumen affect my insurance?
It can. Class A fire rating and wind rating both come up in underwriting, particularly in the hillside and brush-adjacent parts of the service area. Ask your carrier before you choose.
Working with a Sunland roofer
All American Roof Repair & Commercial Roofing has been on Sunland roofs since 1986. We cover Sunland and the surrounding communities including Sherman Oaks, Sylmar and Glendale, and every estimate we write names the material, the underlayment and the flashing scope so you can compare it line for line against anyone else's.
If you want a second opinion on torch down roofing, call (818) 275-0921 or run your address through our instant quote tool for a ballpark figure before you talk to anyone.
Need a roofer in Sunland?
Free inspection, honest scope, and an estimate that names the material and the flashing work. Call (818) 277-6626 or get a ballpark in about a minute.
