Always the Best Service in the Northwest Location!

Flat & Low‑Slope Roofing—Sealed Tight by Blue Moon for Greater Portland

From backyard ADUs to light‑commercial warehouses, we install single‑ply membranes and modified bitumen systems that outlast the Northwest drizzle.

Why a Proper Flat‑Roof System Matters

A properly installed roof does more than keep water out. It:

Zero‑Tolerance for Ponding Water

Even a half‑inch puddle can seep through seams and insulation.

Energy Performance

White reflective membranes cut summer HVAC costs by up to 25 %.

Code Compliance

Oregon requires Class A fire ratings and positive drainage on low‑slope roofs; shortcuts invite citations and leaks.

Long‑Term ROI

Quality single‑ply installs run 20‑30 years with minimal maintenance—cheaper over time than repeated patch jobs.

Maintenance Plans & Leak Prevention

Flat roofs earn their full lifespan only with routine care. Our annual maintenance includes:

  • Debris removal from drains and scuppers
  • Seam inspection & minor seam‑weld touch‑ups
  • Updated photo report for your records and insurance documentation

Cost & Financing

Flat‑roof systems start around $8 – $12 per sq ft installed, driven by membrane type and insulation thickness. We offer zero‑interest for 12 months and long‑term low‑APR plans up to 15 years (OAC).

Your System Options

Membrane

Thickness

Warranty

Best Application

TPO (Thermoplastic Polyolefin)

45 – 80 mil

20–30 yrs

Residential additions, light‑commercial roofs needing reflective surface

PVC (Polyvinyl Chloride

50 – 80 mil

25–30 yrs

Restaurants & buildings with grease vents—superior chemical resistance

EPDM (Ethylene Propylene Diene Monomer)

60 – 90 mil

20–30 yrs

Large uninterrupted decks; perfect for rooftop solar ballast

Torch‑Down SBS Modified Bitumen

2‑ply

15–20 yrs

Small decks, walkable patio surfaces, tight urban spaces

Each install includes tapered insulation (R‑30+ where code requires), edge metal, and a fully adhered or mechanically fastened membrane sealed to manufacturer specs.

TPO (Thermoplastic Polyolefin)

Thickness

45 – 80 mil

Warranty

20–30 yrs

Best Application

Residential additions, light‑commercial roofs needing reflective surface

Thickness

50 – 80 mil

Warranty

25–30 yrs

Best Application

Restaurants & buildings with grease vents—superior chemical resistance

Thickness

60 – 90 mil

Warranty

20–30 yrs

Best Application

Large uninterrupted decks; perfect for rooftop solar ballast

Thickness

2‑ply

Warranty

15–20 yrs

Best Application

Small decks, walkable patio surfaces, tight urban spaces

Each install includes tapered insulation (R‑30+ where code requires), edge metal, and a fully adhered or mechanically fastened membrane sealed to manufacturer specs.

Our Six‑Step Low‑Slope Process

Infrared Moisture Scan & Core Sample

Pinpoint wet insulation and verify deck integrity.

System Recommendation & Quote

Clear comparison of TPO, PVC, EPDM, or mod‑bit with price, warranty, and energy payback.

Permitting & Scheduling

We pull city permits and coordinate dumpster, crane, and material deliveries.

Deck Prep & Insulation Install

Remove saturated layers, repair sheathing, install tapered ISO for proper slope.

Membrane Application & Detail Work

Heat‑weld seams (TPO/PVC) or full adhesive (EPDM); custom‑flash skylights, vents, and parapets.

Final QA & Warranty Registration

Pull‑test seams, water‑test drains, magnet sweep site, and submit warranty docs online.

Most residential‑size decks finish in two workdays; larger commercial roofs may span a week, weather permitting.

Why Architects, Builders & Owners Choose Blue Moon

Factory‑Trained Crews

Certified by GAF EverGuard®, Carlisle SynTec, and Firestone Building Products.

Leak‑Detection Tech

Use infrared drones and electronic capacitance scanners—no guesswork.

Code & Safety Focused:

OSHA‑certified fall protection and on‑site safety officer for multi‑day commercial projects.

Clean Jobsites

Daily sweep, trash haul‑off, and tenant‑friendly access routes.

Warranty Coverage

Because we’re GAF Master Elite® and CertainTeed SELECT ShingleMaster™, you receive:

Manufacturer NDL Warranty

20–30 years covering labor & material (available on TPO/PVC/EPDM when inspected by the rep)

10‑Year Blue Moon Workmanship Guarantee

Covers leaks caused by installation errors—transferable once.

All warranties are transferable once if you sell your home within the first decade.

FAQ

How long does a flat‑roof install take?

Residential decks under 2,000 sq ft usually complete in two days; commercial installations depend on square footage and weather.

Is a white membrane required?

Portland doesn’t mandate cool roofs for low‑slope residential, but white TPO/PVC lowers temps and may qualify for energy rebates.

Can you roof over my existing membrane?

Oregon code allows one recover only if insulation is dry and deck is sound—an infrared scan confirms viability.

Will foot traffic void my warranty?

Standard warranties limit heavy traffic. We can add walkway pads or a granular‑surfaced cap sheet for service routes.

Do you handle rooftop solar coordination?

Yes. We install solar‑ready curbs or ballast plans and coordinate with your solar provider to protect membrane warranty.

Service Area

Flat & low‑slope roofing expertise for

and neighboring communities.

Don’t let ponding water shorten your roof’s life—seal it once and for all.