What Warranty Should I Expect on a New Composite Deck?

Quick Answer: A new composite deck has two separate warranty components: the manufacturer’s product warranty on the composite materials (typically 25 to 30 years for fading and staining on premium products, up to 50 years for Azek PVC) and the contractor’s workmanship warranty on the installation (varies by contractor). Both matter. Know what’s covered in each before signing. The product warranty is only valid if the material was installed correctly – another reason installation quality matters.

The Two Warranty Components to Understand

1. Manufacturer Product Warranty

This warranty comes from the company that made the composite boards, railing, and accessories – Trex, TimberTech, Azek, or another manufacturer. It covers defects in the material itself.

Standard coverage at premium tier:

Structural integrity: The board won’t fail structurally – typically 25 to 30 years depending on brand
Fading: The board won’t fade beyond a specified threshold – typically 25 to 30 years
Staining: The board won’t stain beyond what can be removed with approved cleaning methods – typically 25 years

Azek’s top product line (Landmark) carries a 50-year warranty – the longest in the industry.

What the product warranty typically does NOT cover:

Damage from improper installation (wrong joist spacing, wrong fasteners, etc.)
Damage from improper cleaning products or maintenance
Normal surface weathering in the first year (some initial lightening is expected and normal)
Scratches, gouges, or mechanical damage
Damage from misuse (cutting, drilling, or modifying boards)
Acts of nature beyond normal weathering

2. Contractor Workmanship Warranty

This comes from the deck builder and covers defects in the installation work. Structural problems that result from improper installation – a post that heaves because the footing was too shallow, a ledger that fails because it was improperly attached, railing posts that move because they weren’t properly blocked.

Workmanship warranty terms vary by contractor. Ask specifically: what do you warrant, for how long, and what’s covered? Get it in writing.

DDT Deck Builders stands behind our work. If an installation issue surfaces after we’ve completed a project, we address it.

How the Product Warranty Works in Practice

Filing a warranty claim with a composite manufacturer requires:

Proof of purchase or installation documentation
Evidence that the product was installed per the manufacturer’s specifications (this is where proper installation documentation helps)
Documentation of the issue – photos, description of the problem
Evidence that approved maintenance practices were followed

This is why keeping your permit, your invoice, and any manufacturer documentation after installation matters. The documentation chain becomes important if you ever need to use the warranty.

Proper composite deck maintenance is also part of warranty compliance. Some manufacturers require specific cleaning products and prohibit others.

What Voids the Product Warranty

The following commonly void composite warranties:

Installation over framing that doesn’t meet manufacturer specifications (wrong joist spacing, inadequate blocking)
Use of cleaning products containing bleach above specified concentrations
Painting or staining the boards (why composite can’t be painted or stained)
Physical damage from improper tools (metal snow shovels, wire brushes)
Installation at temperatures outside manufacturer specifications

Important Considerations

The warranty transfers to new owners. Most major composite manufacturer warranties are transferable if you sell your home – an asset at resale. Verify this in the specific product documentation.

Labor and material warranty are separate. If a board fails due to a manufacturing defect, the manufacturer covers the material replacement. But who covers the labor to remove and reinstall? Clarify this with both the contractor and the manufacturer before you assume.

The contractor’s warranty matters. A manufacturer warranty doesn’t help you if the problem is the installation. Know what your contractor stands behind. Choosing a deck builder includes evaluating their warranty terms.

Workmanship warranty is only as good as the contractor still being around. A contractor who is licensed, established, and has a genuine business in the community is more likely to honor a warranty claim in year 7 than a fly-by-night operation.

What to Do Next

When we give you a written estimate, we’ll also explain specifically what we stand behind on workmanship. And we’ll walk you through the manufacturer warranty for whatever product we’re installing.