Substrate & Edge Trims

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:


Techtalk #126 CAN: Plywood Sheathing and Deck Construction Recommendations, Rev January 2017


Techtalk #126 US: Plywood Sheathing and Deck Construction Recommendations, Rev January 2017


Techtalk #126 Supplement: Plywood Requirements Supplement, Sept. 2014


Techtalk #140: Duradek Application to Concrete, May 2013


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

Edge Trims

Your Duradek installer will recommend the best edge trim for your project and for the finished look you desire. Duradek provides 4 options of edge trims.

PVC Coated Metal

1. Vinyl is welded to PVC-coated flashing

2. Vinyl is welded to PVC-coated box scupper

3. Vinyl is welded to PVC-coated overflow

“L” Trim

1. “L” trim secures vinyl on outside and inside edges (optional)

2. To meet roofing codes, vinyl is extended up wall by at least 6 inches

3. Vinyl is overlapped by building paper and exterior finish

Fascia Fully Wrapped

1. Full wrap over fascia

2. Inverted “L” trim with caulking

3. Butyl tape as secondary sealant (screw seals itself with compression)

4. “L” trim at bottom is another option

Metal Flashing with PVC Clip

1. Inside back corner folded and welded, not cut

2. Outside front corner folded and welded, not cut

3. Galvanized flashing with PVC clip holds vinyl in place

4. Roof-quality drain with clamping ring holds vinyl in place

5. Colored metal flashing completes curb waterproofing

Translate »