Flat Roof Replacement Cost Calculator
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What this flat roof replacement cost calculator covers
This tool estimates low-slope membrane replacement planning bands in USD from square footage, membrane family (TPO, EPDM, PVC, modified bitumen, built-up class), tear-off depth, insulation add narrative, deck condition proxy, access tier, regional index, and contingency. It is meant for commercial-style assemblies and many residential low-slope decks—but it is not a substitute for core cuts, infrared moisture mapping, or manufacturer detail drawings.
How it differs from steep-slope shingle math
Steep roofs are priced around bundle coverage, starter, ridge, and pitch safety factors. Flat or low-slope work centers on heat-weld or adhered sheets, flashing transitions, drainage crickets, cover board, and often code-driven R-value upgrades when insulation is removed. If you need plan geometry first, use the roof area calculator for rectangular plans and overhang notes.
Reading the low–mid–high band
Low assumes cooperative weather, straightforward tear, and competitive bidding. Mid is the typical GC conversation anchor. High assumes multi-layer removal, deck repairs, tight logistics, or premium wind-uplift and warranty packages. Always reconcile with written proposals that spell out insulation R-value, attachment pattern, and who owns metal counterflashings.
Common exclusions
- Structural deck redesign, tapered insulation crickets priced as a second model, and paver or amenity deck restoration above the membrane.
- Interior damage, mold remediation, and mechanical curb relocations.
- PV rail penetrations or green roof media—priced as add alternates.
Related tools
For broader remodel envelopes see the construction cost calculator or home addition cost calculator. For attic energy work adjacent to roof decks, the spray foam insulation cost calculator may help bracket insulation conversations separately.
Disclaimer
Educational planning only. Fire, wind, and energy code vary by jurisdiction; verify with a qualified roofer or design professional before relying on any midpoint.