Duradek Waterproofing Membrane Installation Details
Duradek is a system for waterproofing as much as it is a waterproofing product. Duradek and it’s installation procedure, have evolved over the past 25 years. As the technology of building and materials have changed, so has Duradek. Duradek offers to its waterproofing contractors on-going classroom training and newsletters to keep informed of changing procedures and details.
The Duradek training is a combination of floor laying skills for apperance and single ply roofing skills for water tightness. Thourough knowledge of adhesives, sealants, coatings, carpentry and concrete restoration work are common traits of a Duradek contractor.
All necessary components of the finished waterproof system are available from Duradek. This includes adhesives, selants, drains, scuppers and perimeter fastening devices.
Duradek, was introduced in 1974 as the original vinyl membrane for waterproofing roof-decks, balconies and patios. Along with other PVC products, such as siding, windows and industrial roofing, Duradek vinyl has gained wide acceptance in the construction industry as the ultimate in maintenance-free outdoor flooring. Duradek‘s factory engineered products and professional, detailed installation techniques have set new standards for waterproofing that works. All Duradek products, when applied by a certified Duradek contractor are covered by written warranties. Terms are dependant on product thickness.
The Benefits of Duradek are not just skin deep!
1) Textured PVC layer with UV blockers and mildew inhibitors.
2) Second layer of fire retardant PVC.
3) Flexible fabric backing.
4) Duradek aggressive adhesive.
5) Existing substrate of deck or floor.
All Duradek membranes are reinforced for mulit-directional stregenth and stability, and have a textured finish for slip-resistance. To increase performance, the vinyl makeup includes mildew inhibitors along with ultra-violet and heat stabalizers. Duradek is also fire-retardant and resistant to most chemicals. Attractive patterns, colors and textures provide a contemporary look for your outdoor living space. Duradek is continually researching, developing and testing new products and application techniques.
Several requirements are necessary to ensure a sucessfull installation. Here are a few of the more important ones for a typical plywood installation.
Plywood: 3/4″ APA Rated “Sturdi Floor”, T&G Plywood Douglas FIR group 1 or 2
Slope: 2%, 1/4″ per 12″
Rough Door Opening Clearance: 3″ to 6″
Plywood Moisture Content: 12-14% M.C.
Fasteners: 1 3/4″ #10 Coated Deck Screw, 2″ Spiral or 1 3/4″ Ring-Thread Hot Dipped Nails.
6″ O.C @ Perimeter, 8″ O.C. @ Feild.
Surface Preperation: Spot fill all knotholes, depressions, damaged areas & fastener heads. Do not fill
plywood gaps 1/16″ or less. Double fill all gaps 1/8″ or more.
(Please contact us or a trained applicator with inquires regarding speciffic installations.
Prep and patch floor surface.
More prep and patch..ready for adhesive for vinyl membrane to be installed.
Seams are overlapped 3/4″ and heat welded. The seams are stronger than the base material…two layers fused together.
Finished waterproof deck surface. Will not crack, chip, peal the way liquid coating systems do.
“L” Trim Details
1) “L” trim secures vinyl on outside and insideedges. 2) To meet roofing codes, vinyl is extended up wall at least 6 inch 3) Vinyl is overlapped by building paper an
Metal Flashing With PVC Clip
1) Inside corner folded and welded-not cut. 2) Outside 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.
PVC Coated Metal Details
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.
Fully Wrapped Facia
1) Full wrap over facia. 2) Inverted “L” trim with sealant (gumstop.) 3) Butyl tape as secondary sealant. (Screw seals itself with compression.) 4) “L” trim at bottom is another option.
Typical Door Detail (see our video on Door Pan Flashing )
- Techtalk #161: Duradek Application to Sealed or Coated Surfaces
- Techtalk #140: Duradek Application to Concrete
- Techtalk #126 USA: Plywood Sheathing & Deck Construction Recommendations, Rev. Dec. 2011
- Techtalk #126 Supplement: Plywood Requirements Supplement
Duradek USA Approvals