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The following technical details outline key components of a vinyl decking system.
These elements work together to ensure proper waterproofing, drainage, and long-term durability.
Flashings & Edge Details
PVC Flashing
PVC flashing is used to protect deck edges and provide a clean, finished appearance.
It is fabricated from heavy-gauge galvanized metal and vinyl-coated to match the decking membrane.
This system allows the vinyl membrane to be welded directly to the flashing, creating a continuous waterproof surface.
Proper installation helps prevent water intrusion, pooling, and debris buildup along the deck perimeter.
Multiple color options are available to complement fascia boards, trim, and vinyl selections.
PVC Flashing Options
Option 1: Vinyl-Welded PVC Flashing
This option provides a clean, finished deck edge with vinyl welded directly to the flashing.
Available in four standard colors white, gray, beige, and black it allows the deck edge to blend seamlessly with fascia boards and surrounding finishes.
The welded connection creates a continuous waterproof termination along the deck edge.
Option 2: Welded-Down Vinyl Flashing
In this option, the vinyl membrane is welded directly down over the flashing, eliminating the need for PVC termination clips.
This approach creates a streamlined edge detail with fewer components while maintaining reliable waterproof performance.
L-trim Flashing
This flashing option creates a clean, subtle deck edge with no raised profile that could interfere with water drainage.
The vinyl membrane can be extended down over the fascia and secured with the L-trim, providing a continuous edge detail along the perimeter.
L-trim flashing offers a balanced combination of appearance, durability, and reliable waterproof performance.
L-trim is available in a variety of powder-coated color options, allowing the deck edge to be coordinated with fascia boards and exterior finishes.
Galvanized Flashing & PVC Clip
Galvanized flashing combined with a PVC termination clip creates a durable deck edge detail for vinyl decking systems.
The galvanized flashing is installed directly to the substrate before the vinyl membrane is applied.
Once installed, the vinyl membrane is wrapped over the deck edge and securely fastened using a PVC termination clip.
This system provides a reliable and integrated edge solution that supports proper drainage and long-term performance.
The combination of galvanized flashing and PVC clip creates a clean, consistent deck edge while maintaining waterproof integrity.
Types of Vinyl Decking Seams
Seam options affect both surface appearance and walking comfort while maintaining waterproof integrity.
Regular Seam Has Bump
Regular seams are created by overlapping two vinyl sheets and heat welding them together.
This method results in a slightly raised seam that can be seen and felt underfoot.
Regular seams are a common and reliable option used in many vinyl decking installations.
Recessed Seam No Bump
Recessed seams are formed by routing the substrate so the welded seam sits flush with the deck surface.
This creates a smooth walking surface with no noticeable bump, resulting in a more uniform and natural appearance.
Recessed seams require additional preparation and are typically selected for aesthetic reasons
T-seam Has Bump
T-seams are used where three vinyl sheets meet at a single point.
This seam configuration is typically required by deck layout and sheet orientation rather than visual preference.
The welded T-shaped joint remains fully waterproof when installed correctly, though it creates a slightly raised seam at the intersection.
Installation & Waterproofing Details
Proper detailing is essential to the performance of a vinyl decking system.
The following details address key transition points and areas exposed to water.
Heat Welded Seams
Heat welding is used to fuse overlapping vinyl sheets into a continuous waterproof seam.
This process creates a durable bond that prevents water penetration and ensures long-term performance.
Water Diverter
Water diverters are installed below the vinyl membrane to redirect water away from critical areas.
They help manage drainage and reduce water exposure at vulnerable transition points.
Deck Meets Wall
Deck-to-wall transitions are waterproofed to prevent moisture intrusion behind wall finishes.
Proper flashing and sealing allow for correct drainage and long-term protection at this intersection.
Door Detail
Door openings, sills, and jambs are waterproofed prior to door installation.
This detail helps prevent moisture intrusion at one of the most exposed areas of the deck.
Folded Inside Corner
Inside corners are formed by folding and heat welding the vinyl membrane in place.
This method creates a continuous waterproof seal without the need for relief cuts.
Welded Corner Detail
Outside corners are reinforced with welded corner patches to maintain waterproof integrity.
These details protect high-exposure areas and help prevent future leaks.
Water Drain
Drains are installed to allow proper water removal from decks and flat roof areas.
Correct placement and sealing ensure reliable drainage and a fully waterproof system.
Post Wrap
Post wraps are created by folding and welding the vinyl membrane around structural posts.
This method provides a continuous waterproof seal without unnecessary cuts or penetrations.
Seal Exteriors & Vinyl
In some cases, exterior-grade sealants are used to enhance protection at specific transition points.
Sealants are applied where required to support overall waterproof performance.
Regular Edge Detail
Edge details are designed to direct water away from the deck surface and structure.
Proper edge termination supports drainage and helps protect surrounding finishes.
