TPO Roofing

TPO is a blend of polypropylene and ethylene-propylene rubber, reinforced with a polyester scrim for tear strength. It's flexible enough to handle building movement and thermal cycling without cracking.

• Single-ply thermoplastic membrane, 45 to 80 mil thick
• Reinforced with woven polyester scrim for puncture and tear resistance
• UV-stable formulation — won't yellow or chalk like older membranes
• Recyclable at end of life

Every overlap is welded with a hot-air robot at 900 – 1100°F, fusing the two sheets into one. No caulk, no adhesive, no seam tape — the seam is stronger than the membrane itself.

• Robotic welder maintains consistent temperature and speed
• Every seam probe-tested for continuous bond
• T-joints and details hand-welded by a certified installer
• Seams don't degrade with age the way adhesive seams do

The membrane is only half of a TPO roof. Rigid insulation below sets the drainage slope and the R-value.

• Tapered polyiso engineered to 1/4" per foot minimum slope
• R-25 to R-38 typical (per WA energy code)
• Cover board (DensDeck or high-density polyiso) protects the membrane
• Mechanically fastened or fully adhered depending on wind zone

The bright white top layer reflects roughly 85% of incoming solar radiation. On a flat roof that would otherwise bake all summer, that translates to real cooling savings and longer membrane life.

• ENERGY STAR and CRRC-rated cool roof
• Cuts rooftop temperature 50 – 70°F on a hot day
• Reduces HVAC load and extends membrane lifespan
• Tan and gray colors available where reflectivity isn't required

TPO is the go-to for any low-slope area on a home, and for most small commercial roofs.

• Modern flat-roof homes and additions
• Dormers and low-slope tie-ins on pitched roofs
• Detached garages, ADUs, and shed roofs
• Small commercial: offices, warehouses, retail
• Rooftop deck substrates (with foot-traffic pads)

Ponding water is what kills flat roofs — including TPO. We engineer positive drainage into every install.

• 1/4" per foot minimum slope built into tapered insulation
• Interior drains with clamping rings and flashed sumps
• Scupper and overflow drainage where required by code
• Downspout tie-ins sized for peak Seattle rainfall

TPO is one of the lowest-maintenance roof types you can own — but it isn't zero-maintenance.

• Annual visual inspection (we offer this as a maintenance plan)
• Clear leaves and debris from drains twice a year
• Repair punctures promptly with a welded patch
• Avoid solvent-based cleaners on the membrane

Availability and warranty length vary by distributor and roof size. We're happy to quote whichever spec fits your project.

• GAF EverGuard TPO
• Carlisle Sure-Weld TPO
• Johns Manville JM TPO
• Firestone UltraPly TPO
• Mule-Hide TPO

Our standard TPO build removes the common failure points we see on other crews' work.

• Full tear-off and deck inspection before install
• .060 gauge membrane standard, .080 upgrade available
• Tapered polyiso with cover board — no ponding water
• Every seam robot-welded and probe-tested
• Pre-fab pipe boots and hand-welded penetration flashings
• Painted coping cap and drip metal color-matched to trim
• Written manufacturer warranty + our 5-year workmanship warranty