Composite Decking Warranty Comparison: Trex vs TimberTech vs Fiberon

You're spending $65-95 per square foot for a composite deck in Ontario. The warranty determines whether that investment lasts 25 years or becomes a headache at year 10.

Composite decking warranties vary drastically between brands and product lines. Some cover fading and staining for 25 years. Others limit coverage to manufacturing defects only. Understanding what's actually covered—and what voids the warranty—matters more in Ontario's freeze-thaw climate than in milder regions.

How Composite Decking Warranties Actually Work

Most composite decking comes with two separate warranties:

Residential Limited Warranty covers manufacturing defects, structural issues, and material failure. This is typically 25-50 years and transferable to future homeowners (with conditions).

Fade and Stain Warranty covers color change and staining from everyday use. This ranges from 10-25 years depending on product tier and includes specific percentage limits—like "no more than a certain Delta E color change" in technical terms.

The catch: warranties are prorated after an initial period. If your decking fades in year 15 under a 25-year warranty with 10-year full coverage, you might only get 40% credit toward replacement material. You still pay for labor, disposal, and installation.

Ontario's freeze-thaw cycles, winter salt exposure, and clay soil movement make warranty exclusions critical. Most manufacturers exclude damage from:

• Improper installation (inadequate ventilation, wrong fasteners, insufficient joist spacing)
• Standing water or inadequate drainage
• Contact with fertilizers, deck cleaners not approved by manufacturer
• Scratches, dents, or surface damage from moving objects
• Structural movement or settlement of the deck frame

Read the fine print. "Limited warranty" means exactly that.

Trex Warranty Coverage in Canada

Trex offers different warranty tiers based on product line. Here's what Canadian homeowners actually get:

Trex Transcend and Select Lines

25-year residential limited warranty covering:

• Material defects and structural integrity
• Fade and stain resistance for 25 years (prorated after year 1)
• Transferable once to subsequent homeowner

50-year limited warranty on Transcend Lineage (their premium line):

• 50 years fade and stain coverage
• 50 years structural warranty
• Same proration after first year

Trex Enhance Line

25-year residential limited warranty with reduced fade/stain coverage:

• 25 years structural
• 25 years fade and stain (more aggressive proration than Transcend)

What Trex Actually Covers

Trex warrants against "material loss of structural integrity" and "material fading or staining from normal use." In practice:

• Covered: Factory defects, warping beyond spec, cracking from manufacturing issues, color fade exceeding their Delta E standard
• Not covered: Fading from deck cleaners with chlorine bleach, scratches from pets or furniture, mold/mildew growth (considered maintenance), damage from snow shovels or salt

Ontario-specific concern: Trex requires adequate ventilation under the deck and proper drainage. If your builder installed composite over solid concrete or too close to grade without airflow, Trex can deny warranty claims for mold or board cupping.

Trex warranty claims require:

1. Original purchase receipt

2. Photos showing the defect

3. Proof the deck was installed per Trex specifications

4. Proof you've been maintaining it (cleaning annually)

Labor is never covered. If you get a material replacement in year 12, you're paying a contractor $25-45 per square foot to remove the old boards and install the new ones.

Learn more about composite maintenance requirements

TimberTech Warranty Coverage in Canada

TimberTech (owned by AZEK) separates warranties by product line more aggressively than Trex. Here's the breakdown:

TimberTech AZEK Line (Premium Capped Polymer)

50-year limited warranty with:

• 50 years fade and stain coverage (non-prorated for first 25 years on some SKUs)
• 50 years structural warranty
• Best protection against mold/mildew (includes coverage for surface mold that can't be removed with approved cleaners)
• Transferable once

This is the only composite line that includes mold coverage beyond "normal cleaning." In Ontario's humid summers, that's worth noting.

TimberTech PRO (Standard Capped Composite)

30-year limited warranty:

• 30 years structural
• 25 years fade and stain (prorated after year 1)
• Transferable once

TimberTech Edge (Budget Line)

25-year limited warranty:

• 25 years structural
• 25 years fade and stain (heavily prorated)
• Transferable once

TimberTech Warranty Exclusions

TimberTech is more specific about installation requirements:

• Joist spacing: Must follow their span tables (typically 16" on center for perpendicular, 12" for 45-degree angle)
• Fascia boards: Must be installed with adequate backing and ventilation
• Fasteners: Must use TimberTech-approved hidden fasteners or stainless steel screws
• End cuts: Must be sealed if specified for that product line

Ontario-specific issue: TimberTech excludes "conditions beyond the manufacturer's control including natural disasters, acts of God, or extreme weather." In practice, they've honored claims after freeze-thaw damage if installation was correct—but document everything.

TimberTech's warranty claim process requires a dealer inspection before they approve replacements. That means finding your original supplier or an authorized TimberTech dealer in KWC to submit the claim on your behalf.

Fiberon Warranty Coverage in Canada

Fiberon warranties are straightforward but less generous on premium coverage:

Fiberon Paramount and Horizon Lines

25-year limited warranty:

• 25 years structural
• 20 years fade and stain (prorated after year 1)
• Transferable once

Fiberon Good Life Line (Budget)

25-year limited warranty:

• 25 years structural
• 10 years fade and stain (prorated after year 1)
• Transferable once

What Makes Fiberon Different

Fiberon's warranty language is more conservative:

• Covered: Material defects, warping beyond tolerance, structural failure, excessive fading per their standard
• Not covered: Surface mold/mildew (at all—they consider it maintenance), scratches, dents, color variation between production runs

Key limitation: Fiberon's fade warranty measures "excessive fading" using Hunter L,a,b color space values. They require professional color measurement, not visual assessment. If you claim fading, they may send a technician to take readings before approving.

Fiberon requires:

• Original dated sales receipt
• Photos of the defect
• Proof of proper installation per their instructions
• Name of the installer (contractor or DIY)

Ontario consideration: Fiberon's 20-year fade/stain warranty on premium lines is shorter than Trex or TimberTech's 25-50 years. If long-term color retention matters for your $70-85/sqft installed investment, this is a meaningful difference.

Compare composite deck costs in detail

Side-by-Side Warranty Comparison

| Feature | Trex Transcend | TimberTech AZEK | Fiberon Paramount |

|---------|---------------|-----------------|-------------------|

| Structural Warranty | 25 years | 50 years | 25 years |

| Fade/Stain Warranty | 25 years | 50 years | 20 years |

| Proration Starts | Year 2 | Year 26 (some SKUs) | Year 2 |

| Mold Coverage | No | Yes (surface mold) | No |

| Transferable | Once | Once | Once |

| Labor Coverage | No | No | No |

| Claim Process | Direct to manufacturer | Dealer-required | Direct to manufacturer |

| Canadian Support | Yes (toll-free) | Yes (toll-free) | Yes (toll-free) |

What Matters Most for Ontario Decks

Warranty length matters less than what's actually covered. Here's what Ontario homeowners should prioritize:

1. Fade and Stain Coverage Duration

Ontario gets strong UV exposure in summer and salt/sand exposure in winter. If you're paying for premium composite, get at least 25 years of fade/stain coverage. Budget lines with 10-15 year fade warranties will show color change long before the structural warranty expires.

2. Proration Terms

A 50-year warranty that prorates after year 1 gives you less value than a 25-year warranty with 10 years of full coverage. Ask your contractor:

• How many years of non-prorated coverage?
• What's the proration formula? (Annual percentage or stepped?)
• Is labor ever reimbursed? (Almost never, but worth asking)

3. Mold and Mildew Coverage

Most composite decking warranties exclude surface mold. They consider it a maintenance issue. TimberTech AZEK is the exception—they cover surface mold that can't be removed with approved cleaners.

In Ontario's humid climate, north-facing decks under tree cover will grow mold. If your deck gets limited sun, factor in annual cleaning costs or choose a product with mold coverage.

4. Installation Requirements

Warranties become void if installation doesn't meet manufacturer specs. Critical items:

• Joist spacing: 16" on center for most composite (12" for diagonal, 45-degree installs)
• Ventilation: Minimum 6" clearance below deck for airflow
• Drainage: No standing water or pooling
• Fasteners: Manufacturer-approved hidden fasteners or stainless screws
• End sealing: Some products require cut ends to be sealed

Your builder contract should specify installation per manufacturer warranty requirements. Include this language when getting quotes.

See what to include in your deck builder contract

5. Transferability

All three brands allow one warranty transfer to a future homeowner. This adds resale value. To transfer:

• Notify the manufacturer within 90 days of closing
• Provide original purchase documentation
• Pay transfer fee (typically $50-150)

Warranties transfer with reduced coverage—usually prorated from original install date, not from transfer date.

What Warranty Claims Actually Look Like

Real-world scenario: your Trex Transcend deck fades noticeably in year 8. You contact Trex warranty support.

They'll ask for:

• Original sales receipt showing product line and square footage
• Photos clearly showing the fading (they may request color measurement)
• Proof of installation per Trex specs (photos of joist spacing, ventilation, fasteners)
• Proof of annual cleaning/maintenance
• Description of deck cleaners you've used

If approved: Trex provides replacement material at prorated cost (you pay 30% in year 8 under typical proration). You pay for:

• Removal of old boards: $5-10/sqft
• Disposal fees: $200-500 depending on deck size
• Installation labor: $25-45/sqft
• Matching stair treads, fascia, or other components

Total out-of-pocket for a 200 sqft deck section in year 8: $5,000-10,000 even with warranty coverage.

This is why installation quality matters more than warranty length. A properly built deck that follows manufacturer specs won't need warranty claims.

Common Questions

Does composite decking warranty cover winter salt damage in Ontario?

No. All three brands exclude damage from ice melt products, fertilizers, and harsh chemicals. Use calcium chloride ice melt instead of rock salt, and rinse the deck in early spring. Surface pitting or discoloration from salt voids the warranty.

Can I transfer my composite decking warranty if I sell my house?

Yes, once. Trex, TimberTech, and Fiberon allow one warranty transfer to a subsequent homeowner. You must notify the manufacturer within 90 days of closing and pay a transfer fee (typically $50-150). The warranty remains prorated from the original install date.

What happens if my deck builder goes out of business and I need a warranty claim?

Manufacturer warranties are separate from contractor warranties. You deal directly with Trex, TimberTech, or Fiberon—not your builder. However, you'll need to prove the deck was installed per manufacturer specs. Keep your permit drawings, installation photos, and contractor invoices in a permanent file.

Does the warranty cover color variation between old and new boards if I expand my deck later?

No. Composite decking colors vary between production runs. If you add a section 5 years after the original install, the new boards won't perfectly match the weathered originals. This is considered normal and isn't covered. Order 10% extra material during your initial build and store it for future repairs or expansions.

Will my warranty claim be denied if I didn't pull a building permit?

Warranty coverage isn't legally tied to permits, but manufacturers may deny claims if the deck wasn't built to code. Ontario building code requirements ensure proper structure, drainage, and ventilation—the same things manufacturers require. If your unpermitted deck fails warranty inspection because of improper installation, you're out of luck.

Related: Composite Decking Calculator: How Much Material Do I Need?.