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Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board

Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board

Best price now

$39.00at Chinook LumberObserved at 9:34 AM

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Our take on the Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board

This is a single Trex composite deck board in Rocky Harbor, a sandy grey with a wood-grain pattern. It measures 1 in. thick, 5-1/2 in. wide and 12 ft. long, with a grooved edge made for hidden fasteners. The capped shell resists fading, staining, rot and splintering, and Trex backs it with a 25-year limited residential warranty. The best new price is $39.00 at Chinook Lumber as of November 5, 2026, and only one store lists it new, so there is little price competition to compare against.

Best forHomeowners replacing a worn wood deckLow-maintenance decks that skip annual sealingHidden-fastener installations with Trex clipsCoastal or damp climates where wood rots
Pros
  • Capped shell resists fading and staining
  • No rot, warping or splintering
  • Cleans with soap and water
  • 25-year limited residential warranty
  • Grooved edge hides fasteners for a clean surface
Cons
  • One board only; a full deck needs many
  • Grooved edge requires clips, not face screws
  • Heavier and pricier per foot than pressure-treated wood
  • Rocky Harbor is a single fixed color

Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board prices at every store

  • Chinook LumberNew

    In stock

    $39.00Observed at 9:34 AM
    Visit store

Also available at

  • Supply OntimeCheck price at Supply Ontime

Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board price history

Lowest price we've seen: $39.00 on Nov 5 at Chinook Lumber. Tracked across 1 store since Nov 5.

What reviewers say

Trex's capped lines are widely reported to hold color and clean up well over years of sun and rain. Owners often note the boards stay cooler and splinter-free underfoot compared with wood. Complaints tend to center on cost and on surface scuffs from furniture and pets.

Pros
  • Color holds up over seasons
  • No splinters or rot
  • Easy soap-and-water cleaning
  • Hidden fasteners give a clean look
Cons
  • Higher cost than wood
  • Can scuff or scratch under heavy furniture
  • Needs specific clips and spacing

From Chinook Lumber

  • Authentic wood-grain appearance with the durability of composite
  • Scalloped profile makes boards as lightweight as lumber
  • Low maintenance; cleans easily with soap and water
  • Protective outer shell resists fading and staining
  • Won't rot, warp or splinter unlike wood
  • Grooved edge for use with Trex hidden fasteners for a screw-free surface
Materials
High-performance composite made from 95% recycled materials
Care
Cleans easily with soap and water
Guarantee
25-Year Limited Residential Fade & Stain Warranty
Returns
Special Order - Returns Subject to Supplier Terms
Shipping
In-store pick up; available in 1 day at the Snohomish, North Bend and Arlington stores

About the Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board

About This Product

The beauty of wood with the ease of composite. With its authentic wood-grain appearance, Trex Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board offers all the charm and none of the trouble of pressure-treated lumber. Imagine enjoying the very same rich streaking now and 25-years from now without costly, continual upkeep.

Key Features

• Contemporary Color: Rocky Harbor offers a neutral composite deck color with sandy undertones and a rustic slate grey, featuring a wood-like grain pattern.

• Durable and Long-Lasting: Trex high-performance composite deck board resists rot, warping, and splintering, unlike traditional wood.

• Protective Outer Shell: Designed to resist fading and staining for enhanced durability.

• Low-Maintenance Material: Cleans easily with just soap and water.

• Warranty Protection: Backed by Trex’s 25-year Limited Residential Warranty and Fade and Stain Warranty.

• Versatile Installation Options: Use grooved-edge boards with Trex hidden fasteners for a screw-free surface or square-edge boards for traditional applications, edging, and stairs.

• Eco-Friendly: Made of 95% recycled materials in the USA for a sustainable choice.

• Lightweight Design: Scalloped profile ensures easy handling and installation.

• Simple Installation: No specialty tools required for hassle-free setup.

Specifications

Thickness
1.00 in
Length
144"Source
Width
5.5"Source
Height
0.94"Source

Questions and answers

Is composite decking worth it over pressure-treated wood?
It costs more up front but skips the annual staining and sealing that wood needs. Over 25 years the upkeep savings often close the gap, and the board will not rot or splinter.
What fasteners does the grooved edge need?
Grooved boards take hidden clips, such as Trex Hideaway fasteners, set in the groove between boards. You do not face-screw through the top, which keeps the surface clean.
How many boards do I need for a deck?
Divide the deck width by the 5-1/2 in. board width plus the gap, then add 10 percent for cuts and waste. This listing is one 12 ft. board, so most decks need dozens.
Does it need a gap between boards?
Yes. Leave a small gap, typically about 1/8 to 3/16 in., for drainage and expansion. The hidden clip system sets this spacing for you.
When is the price lowest?
Decking tends to discount in late fall and winter, outside the spring building season. With only one store listing this board new at $39.00 as of November 5, 2026, watch for seasonal sales at lumber yards.
Where is the Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board cheapest?
At Chinook Lumber, for $39.00, as of our latest check.
Where can I buy the Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board?
2 stores we checked sell it, including Chinook Lumber, Supply Ontime.

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Buying guides that pick the Composite Decking 1 in. x 5-1/2 in. x 12 ft. Rocky Harbor Grooved Edge Board

  • Best composite decking boards
Product Weight
23.39 LBSource
Material
COMPOSITESource
Colour Family
GREYSource
Collection
ENHANCE NATURALSSource
Edge Profile
Grooved edge boardSource
Recycled Content
95% recycled plastic film and reclaimed sawdustSource
Warranty
25-Year Limited Residential Fade & Stain WarrantySource