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If People Walk On It, TPO Is the Wrong Membrane.
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Your general roofer sold you white TPO for your deck, terrace, or balcony. It's punctured. The seams are splitting. Water is pooling. Here's why — and why Dec-Tec is the system designed for spaces where people actually walk, sit, and entertain.
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Get a Free Dec-Tec Analysis
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Authorized Dec-Tec Applicator • 17+ Years in Metro Atlanta • (770) 294-5181
Dec-Tec vs TPO on Walkable Decks — Specification Breakdown
TPO is a commercial flat-roof membrane, not a deck surface. Here's what each material's own warranty language and ICC listings actually cover — with sources, verified 2026-04-22.
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The Universal Failure Mode Across Every Vertical: "The general roofer sold us TPO for a surface people walk on."
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Senior living facilities. Luxury multifamily rooftop decks. Commercial office terraces. Hotel rooftop bars. Five different verticals, one shared pain — the roofer installed a roof membrane on a space that was designed to be walked on, furnished, and used daily.
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TPO is a roof membrane. It was designed to shed water while protected by ballast or insulation. It was NOT designed for pedestrian wear, furniture loads, walker wheels, or slip resistance. And when it fails on a deck, the cost isn't just repair — it's resident falls, tenant turnover, health department citations, and the long slow embarrassment of a "luxury amenity" closed under caution tape.
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5 Ways TPO Fails on a Walkable Surface
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1. Puncture Under Foot Traffic + Furniture
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Chair legs, planter feet, grill wheels, walker tips, stiletto heels — all concentrate load on a small contact point. TPO is 45–80 mils thick and punctures under repeated use. Walker wheels on a senior living terrace perforate seams within months. Dec-Tec is 60–80 mils with fiberglass reinforcement, engineered for intentional foot traffic.
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2. Seam Failure — the #1 Deck Leak Source
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TPO seams are heat-welded but develop micro-separation at weld edges under thermal cycling and repeated foot traffic. Adhesive-seamed systems fail faster — glue degrades under UV, ponding water, and walker wheels dragging across it. Dec-Tec seams use the same PVC formulation as the field membrane with no stiffness differential — fusion-bonded, monolithic, permanent.
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3. Dangerously Slick When Wet
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White TPO is smooth. Water on TPO + foot traffic = slip-and-fall liability. One resident fall on a senior living terrace triggers an incident report, family lawsuit, and state survey deficiency. Dec-Tec carries NFSI High Traction slip-resistance rating with embedded textured surface — exceeds ADA standards in wet conditions.
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4. Zero Aesthetic Value — Industrial White Roof Look
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Your architect designed a finished amenity deck. The roofer installed a white industrial roof. Tenants call it "the rooftop parking lot." Lease-up slows. The competing building down the street has a Dec-Tec finished terrace in slate or wood-plank aesthetic — and they're winning the tenant. Dec-Tec offers 11+ decorative finishes that ARE the waterproofing, not a separate finish layer.
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5. Warranty Void Under Pedestrian Traffic
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Read the fine print on most TPO warranties: damage from pedestrian traffic, furniture, or "uncontrolled foot traffic" is explicitly excluded. A rooftop deck with 50 tenants using it weekly generates more foot traffic in a month than a commercial roof sees in a decade. You are not covered. Dec-Tec's 15-year manufacturer warranty specifically covers walkable service.
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Why CKR Is Different
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We Weld. They Glue.
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Every seam is hot-air welded — fusion-bonded at the molecular level, no adhesive gaps, no tape failure points. Most competing deck systems rely on peel-and-stick or adhesive seams that delaminate under thermal cycling. Adhesive seams are the #1 failure point on walkable decks. Welded seams are permanent.
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We Certify. They Generalize.
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We are an Authorized Dec-Tec Applicator with factory training on hot-air welding, detail flashing, and quality control. We don't "also install" Dec-Tec alongside 15 other membrane brands. This is what we do. Walkable membranes are a specialty. The seams are different. The flashings are different. The warranty requirements are different.
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We Design for Feet. They Design for Drone Photos.
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A standard roof membrane looks fine in a marketing aerial — flat, white, uniform. But nobody walks on it. Your deck is a surface real people use every day, in flip-flops, with walkers, with cocktail trays at 6 PM on a Friday. Dec-Tec is engineered for that reality: slip-resistant when wet, UV-stable, puncture-resistant under furniture and planter loads.
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Side-by-Side: TPO on a Deck vs Dec-Tec on a Deck
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TPO on a Deck
- Designed for rooftops, not foot traffic
- Punctures under chair legs, planters, and walker wheels
- Slick when wet, creating slip-and-fall liability
- Warranty is typically void under pedestrian use
- Industrial white appearance only
- Seam failure is the #1 leak source
- Typical lifespan on a deck: 5-10 years
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Dec-Tec on a Deck
- Engineered for pedestrian occupancy
- Impact-resistant wear surface with fiberglass reinforcement
- NFSI High Traction slip-resistant texture
- 15-year warranty covers walkable service
- 11+ decorative finishes including slate, tile, wood plank, and CoolStep
- Hot-air welded monolithic seams
- Typical lifespan: 20+ years
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The Honesty Framework: When TPO IS the Right Answer
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We are a specialty walkable membrane contractor — AND a GAF + Versico certified commercial TPO installer. We do both. That means we tell the truth about when each is the right spec:
- Use TPO for inaccessible commercial roofs
TPO is the right answer for low-slope warehouse, multifamily, retail, and office roofs with controlled service access and no public foot traffic.
- Do not use TPO as a finished deck surface
Rooftop decks, terraces, balconies, pool surrounds, and furnished amenity areas need a membrane built for pedestrian wear, wet slip resistance, and point loads.
- Coordinate both systems when a building needs both
When a property has a TPO roof and a Dec-Tec amenity deck, CKR installs both so the roof-to-deck interface is handled by one crew and one warranty path.
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Is TPO Already Failing on Your Deck?
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Free on-site analysis. We'll document current failure points, show you what Dec-Tec would look like in its place, and deliver a written proposal within 48 business hours.
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Claim Your Free Dec-Tec Analysis
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(770) 294-5181 • Serving Duluth, Norcross, Alpharetta, Johns Creek, Peachtree Corners
Is TPO Already Failing on Your Deck?
3 quick questions. Free on-site analysis. Dec-Tec proposal within 48 business hours.
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Three Guarantees. One Less Thing to Worry About.
15-Year Dec-Tec Material Warranty
Every installed Dec-Tec membrane carries a 15-year manufacturer material warranty backed by Dec-Tec Inc. — not a roofer's promise. Covers the vinyl itself against delamination, cracking, and UV degradation.
No-Leak Welded Seam Guarantee
Seams are hot-air welded — fusion-bonded at the molecular level, no adhesive. If water enters through any seam we installed in the first 10 years, we return at no charge to find the source, fix it, and document the repair.
Zero-Displacement Install Protocol
For occupied senior living, multifamily, and hospitality installs: we stage materials outside resident areas, run welders in scheduled windows, and install one section at a time. Residents and guests stay in place.