DECK GAPS.

SOLVED.

The finished trim cap that covers gaps at corners, fascia, and stairs in minutes.

30YR Residential & 10YR Commercial Warranty  /  5ΔE Fade Threshold

Clean,
Finished Look
Allows Your Deck
to Move Naturally
Installs in
Minutes
The problem

Perfect miters don't stay perfect.

Deck boards expand and contract with seasonal temperature and humidity changes. At a mitered corner, that movement can open the seam over time. GAPCAP™ is designed to cover the visible gap while allowing the boards underneath to move.

Up to 1/4"Expansion capacity during summer heat cycles
15%+Moisture absorption leading to wood movement
Every SeasonContinuous expansion and contraction cycles

The difference is in the details

Without a cap, seasonal movement leaves a visible seam at every mitered corner, exposing the core material to moisture and dirt. GAPCAP™ closes that gap with a clean, factory-finished edge that holds up through every season change. Drag the slider to see it for yourself.

Before deck corner without GapCap After deck corner with GapCap installed

Simple, transparent pricing

TopCap

$74.99 CAD/ 2-pack

For walking-surface corners. Available in 90°, 45°, and 0° angles. Colours: Grey, Brown, Black.

FasciaCap

$79.99 CAD/ 2-pack

For fascia boards and stair risers. Available in 90°, 45°, and 0° angles. Colours: Grey, Brown, Black.

Free parcel shipping across Canada on orders over $299 — 3 to 5 business day delivery — 60-day money-back returns.

Shop GapCap →
Made to fit all decks

Simple parts.
Specific angles.

GAPCAP™ is sold in 2-packs and installs with standard composite decking screws. Matching plugs are included for a clean, screwless finish.

Choose your GapCap →
3 angles0° straight runs, 45° mitered corners and 90° square corners.
2 cap stylesTopCap for the top surface; FasciaCap for fascia and risers.
3 coloursBlack, Brown and Grey.
New or existingDesigned for both new construction and retrofit applications.
Treated + compositeDesigned to work with treated wood and composite decking.
Screwless finishInstall with screws, then conceal the fasteners with matching plugs.
How it works

Cover the gap.
Don't fight the movement.

For a new build, plan the corner around the cap. For a retrofit, prepare the existing miter so the cap can seat while leaving room for seasonal movement.

01 / SELECT

Choose the right cap

Match the application and geometry: TopCap or FasciaCap, in 0°, 45° or 90°.

02 / INSTALL

Seat & fasten

Fit the cap over the prepared corner and fasten it to the framing with standard composite decking screws.

03 / FINISH

Plug & walk away

Install the matching plugs for a clean finish that hides the fasteners.

TECHNICAL SPECIFICATIONS

ENGINEERED FOR EVERY ANGLE

Precision CNC-milled caps designed to match standard composite deck angles. Available in three foundational colors to blend seamlessly with any build.

CANADIAN DISTRIBUTOR NETWORK

BECOME AN AUTHORIZED DEALER

Professional contractor installing GapCap on site

Become a stocking dealer

Partner with GapCap Canada to deliver the ultimate seamless deck finish to your clients while improving your margins. Be among the first dealers to carry this new deck corner trim solution.

  • Volume discounts on GapCap corner trim

  • Priority Canada-wide shipping

  • Dedicated account manager

DEALER APPLICATION

Submit your details below. Our wholesale team reviews applications daily and will activate your account within 24 hours.

RISK FREE GUARANTEE

If you're not happy with your GapCap purchase, return it in like-new condition within 60 days for a full refund of the purchase price. Return shipping not included.

WE'RE HERE TO HELP

FAQ

Got questions about tolerances, material compatibility, or logistics? Find the technical details below to ensure a seamless installation.

How does GapCap handle seasonal deck board movement?

GapCap is engineered to accommodate natural expansion and contraction of composite and treated lumber. It provides enough coverage to hide seasonal gaps while allowing boards to move freely beneath the cap.

Is it compatible with Trex decking?

Absolutely. GapCap's dimensions and colour profiles (Grey, Brown, Black) are designed to closely complement standard Trex board thicknesses and finishes for a seamless look.

Does it work with TimberTech boards?

Yes. GapCap works seamlessly with TimberTech composite and PVC lines, ensuring a flush fit and matching aesthetic across different profiles and product lines.

Can I install GapCap on an existing deck?

Yes. GapCap is designed for both new builds and retrofits. Simply secure it over the existing joint using standard composite deck screws—no dismantling required.

Do you ship across Canada?

Yes, as the authorized Canadian distributor, we ship nationwide. Standard shipping times apply, with expedited options available for commercial and contractor projects.

The Ultimate Deck Shop logo

The Ultimate Deck Shop is GapCap's exclusive authorized Canadian distributor, and a full-line wholesale supplier of decking, railing, hardscape, and fencing brands to contractors and retailers across Canada.

CONTACT

GapCap Canada Support c/o The Ultimate Deck Shop

Saskatoon: 320 68 Street | 306-249-3325

Regina: 141 4 Ave E | 306-359-3325

[email protected]

Authorized Canadian Distributor Badge

© 2026 GapCap Canada.
All rights reserved.