Substrate & Edge Trims

Substrate and Edge Trim Considerations for Vinyl Decking

Duradek provides an installed waterproofing system complete with edge trims for vinyl decking. Our Trained and Authorized Installers are well versed in general waterproofing principles and can recommend the Good, Better and Best detail options for your decking project.

The recommendations from your Duradek Installer would be determined by the specific project parameters such as new construction versus renovation work, details unique to the project, budget considerations, or by a preference of the look or function of the deck.

Please see the three substrate recommendations and four edge trim options available for a Duradek vinyl membrane installation below. Then, reach out to your local Duradek Installer to discuss which option is best for your project and your budget.

Vinyl Decking Substrate Requirements

The first step towards a completely waterproofed vinyl deck is a properly prepared substrate. Duradek must be installed on a flat, smooth surface; including untreated plywood, concrete, and sealed or coated surfaces.

Resources for details on substrate preparation:

Duradek Techtalk 126 CDN - Substrate Preparation for Plywood

Techtalk #126 CAN: Plywood Sheathing and Deck Construction Recommendations, Rev October 2018

Duradek Techtalk 126 US - Substrate Preparation for Plywood


Techtalk #126 US: Plywood Sheathing and Deck Construction Recommendations, Rev October 2018

Duradek Techtalk 126 Supplement - Plywood Requirements


Techtalk #126 Supplement: Plywood Requirements Supplement, Rev October 2018

Duradek Techtalk 140 - Substrate Preparation for Concrete Surfaces


Techtalk #140: Duradek Application to Concrete, May 2013

Duradek Techtalk 161 - Substrate Preparation for Sealed or Coated Surfaces


Techtalk #161: Duradek Application to Sealed or Coated Surfaces, March 2012

Edge Trims and Waterproofing Details for Vinyl Decking

Your Duradek installer will recommend the best edge trim and other waterproofing details for your project. Recommendations are based on best water routing management and for the finished look you desire. Duradek provides 4 options of edge trims and a selection of water routing accessories.

PVC Coated Metal Edge Trim

PVC Coated Metal Edge Trim and Water Routing Accessories

edge trim for vinyl decking
  1. Vinyl extended up the wall 6 to 8 inches (as per local code)
  2. Vinyl welded to PVC-coated overflow drain
  3. Vinyl welded to PVC-coated box scupper
  4. Vinyl welded to PVC-coated drain
  5. Vinyl welded to PVC-coated flashing

“L” Trim Edge Trim and Sequencing

L-Trim Edge Trim and Installation Sequencing Details

edge trim for vinyl decking
  1. Vinyl extended up the wall 6 to 8 inches (as per local code)
  2. Vinyl overlapped by building paper and exterior finish
  3. Caulking in 90° corner
  4. Butyl tape behind L-Trim
  5. L-trim secures (with screws or nails) vinyl on the outside. (Inside edges optional)

PVC Clip Edge Trim with Additional Details

PVC Clip Edge Trim with Corner, Door & Drain Detail

edge trim for vinyl decking Substrate details
  1. Vinyl wrapped door threshold
  2. Outside front corner relieved and patch welded
  3. Inside back corner folded and welded, not cut
  4. Roof-quality drain with clamping ring holds the vinyl in place (with caulking)
  5. Deck to wall intersection (with optional water diverter)
  6. Galvanized flashing with PVC clip holds the vinyl in place
  7. Outside front corner folded and welded, not cut

Fascia Fully Wrapped and L-Trim Option

Fascia Fully Wrapped and L-Trim Option Details

edge trim for vinyl decking substrate for vinyl decking
  1. Full wrap over fascia
  2. Inverted “L” trim with caulking (Gum Lip)
  3. Butyl tape as a sealant (screw seals itself with compression)
  4. “L” trim with stainless steel color matched screws
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