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    Modified bitumen commercial flat roof installed in Arizona
    Commercial · Arizona

    Modified Bitumen Roofing Systems

    One of Arizona's most common low-slope commercial roofing systems, multi-ply SBS and APP modified bitumen.

    Get My Free Modified Bitumen Roofing Quote (602) 975-3359
    Modified Bitumen Roofing in Arizona

    Modified Bitumen Roofing systems engineered for the Arizona climate

    Modified bitumen (mod-bit) is the proven multi-ply flat-roof system that's protected Arizona commercial buildings for decades. Asphalt blended with SBS or APP polymers gives the membrane elasticity in winter and stability through 115°F Phoenix summers.

    Power Peak Roofing installs Polyglass, GAF Ruberoid, and CertainTeed Flintlastic modified bitumen systems, torch-applied, self-adhered, and cold-applied. We also repair and recover existing mod-bit roofs across the Valley.

    Modified Bitumen Roofing systems we install

    SBS Modified Bitumen

    Styrene-Butadiene-Styrene polymer-modified asphalt. Flexible and forgiving in temperature swings, the better choice for buildings with structural movement or rooftop foot traffic.

    APP Modified Bitumen

    Atactic Polypropylene-modified asphalt. Higher heat tolerance and UV resistance, preferred for fully-exposed Arizona rooftops with no protective coating.

    Torch-Down Mod-Bit

    Heat-welded cap sheets installed by certified torch applicators with proper fire-watch protocols. The traditional, most-proven mod-bit installation method.

    Self-Adhered Mod-Bit

    Peel-and-stick membranes, no open flame on the roof. The right choice for occupied buildings, sensitive interiors, and code jurisdictions that restrict torch work.

    Mod-Bit Repairs & Recovers

    Cap-sheet repairs, flashing replacement, and full recover systems where the existing roof is sound but the cap sheet is worn out. Recover saves tear-off costs and disposal fees.

    Best for

    • Low-slope commercial roofs
    • Buildings with rooftop foot traffic
    • Recovers over aged BUR systems
    Typical Lifespan
    20-30 years
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    Free Modified Bitumen Roofing Quote

    Honest, line-itemed pricing from a licensed Arizona roofer. No pressure, no upsells.

    Schedule My Free Inspection (602) 975-3359
    Licensed, Bonded, Insured · ROC# 361724

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    Recent Project

    Mesa shingle + flat roof replacement, Mesa, AZ

    A Mesa home with both a 3-tab asphalt shingle field and a coated modified-bitumen low-slope section, both fully at end-of-life. Real inspection photos, honest findings, no upsell.

    Location
    Mesa, AZ
    Inspected
    June 2026
    Property
    Single-family home
    System
    3-tab asphalt shingle field + coated modified-bitumen low-slope section

    Findings

    • 3-tab shingle field is fully at end-of-life, severe granule loss across every plane exposing the fiberglass mat, the point where UV starts eating the asphalt directly.
    • Dozens of missing and lifted tabs across the main slopes, with prior handyman shingle patches slapped over the failures instead of proper repairs.
    • Failed HVAC curb flashing on the low-slope tie-in, old sealant cracked out, penetrations exposed, active leak path straight into the ceiling below.
    • Coated modified-bitumen flat section has multiple generations of patch coatings peeling apart, cracking, and delaminating from the substrate.
    • Vent boots and pipe jacks on the shingle field are dry-rotted and no longer sealing around the penetrations.
    • Every failure mode we found is age-driven, not storm-driven, this roof is past its service life and needs a full replacement, not another round of patches.
    Our recommendation

    Full tear-off of the shingle field down to the deck, replace any rotted sheathing, new synthetic underlayment, ice-and-water at eaves and valleys, new architectural shingles, all new pipe jacks and vent boots. On the low-slope section: strip the failed coating layers, prime the substrate, install a fresh 2-coat elastomeric system, and re-flash the HVAC curb properly with new termination bar and sealant.

    Get My Free Roof Inspection
    Aerial view of a Mesa AZ home before roof replacement showing weathered gray shinglesAerial
    Front elevation aerial, shingles look uniform from the street, but every plane is toast up close.
    Weathered 3-tab asphalt shingle field with heavy granule loss on Mesa AZ homeOverview
    Wide field shot, chalky, blotchy, granules gone across the whole slope.
    Extreme granule loss on asphalt shingles exposing fiberglass mat fibersDamage
    Close-up, fiberglass mat exposed, no granules left protecting the asphalt.
    Missing and lifted shingle tabs with prior handyman patches on Mesa AZ roofDamage
    Missing tabs and mismatched patches, every dark square is a prior handyman fix.
    Heavily patched asphalt shingle field next to failed flat roof coatingDamage
    Patch on top of patch, the transition down to the flat section is barely holding.
    Degraded asphalt shingles at eave line of Mesa AZ homeDamage
    Eave line, worst wear zone, granules gone, mat blistering.
    HVAC unit at transition between shingle roof and coated flat roof sectionOverview
    HVAC unit sits at the shingle-to-flat transition, critical detail area, no good flashing left.
    Failed HVAC curb flashing with cracked sealant and exposed penetrations on Mesa AZ roofDamage
    Curb flashing failed, sealant cracked, penetrations exposed, active leak path.
    Failed elastomeric coating layers peeling and cracking on flat roof sectionDamage
    Flat section, three generations of patch coating peeling apart from each other.
    Close-up of cracked and delaminating flat roof coating showing substrateDetail
    Coating detail, alligator cracking down to the substrate, no waterproofing left.
    Mesa roof replacement in progress with synthetic underlayment installed across shingle slopesDuring
    During install, fresh synthetic underlayment down before the new field gets loaded.
    Street view of Mesa roof replacement with crew and Power Peak bannerDuring
    Street-side progress shot, crew on the roof, banner up, new system going on.
    Completed brown architectural shingle roof on Mesa home main slopeAfter
    Finished main slope, clean lines, even courses, fresh brown architectural shingles.
    Completed Mesa shingle and low-slope roof replacement with crew doing final cleanupAfter
    After install overview, new shingle field tied cleanly into the low-slope section.
    Completed low-slope roof section on Mesa home with fresh tan coatingAfter
    Finished low-slope section, fresh coating and clean perimeter edges.
    Completed transition between new architectural shingles and low-slope coated sectionAfter
    Shingle-to-flat transition finished correctly with a clean tie-in around the HVAC area.
    Modified Bitumen Roofing FAQ

    Modified Bitumen Roofing questions, honestly answered

    Common questions Arizona property owners ask us about modified bitumen roofing. Don't see yours? Call (602) 975-3359.

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