Wca Core Flex
- 2. A Weldable Thermoplastic Membrane… … with an Active Polymer Core Coretex – Active Polymer Core 45 mil or 60 mil Thermoplastic Membrane
- 3. Thermoplastic Membrane Heat weldable seams Superior chemical resistance High puncture resistance High hydrostatic resistance Active Polymer Core Layer Self-sealing layer Bonds to poured concrete Cushion/protection layer Enhances puncture resistance Minimized lateral flow at concrete interface CoreFlex Features
- 4. Knitted 5 oz. Polyester Adhesive flood coating encapsulates fibers Inhibits wicking of moisture Enhances thermoplastic coating bond to fabric Exceptional puncture and tensile properties Base Reinforcing Fabric
- 5. Thermoplastic Coatings Laminated to adhesive coated fabric for superior membrane construction Encapsulates and bonds to fabric to prevent wicking Provides durable weldable surfaces Yellow color of top coat provides visibility and product identification Produced with DuPont ™ Elvaloy KEE to maintain flexibility
- 6. DuPont ™ Elvaloy KEE Solid high molecular weight plasticizer Solid additive - not a liquid plasticizer Maintains performance longevity Improves chemical resistance Enhances welding properties Prevents age and stress cracking due to loss / migration of plasticizer Shattered PVC After Loss of Liquid Plasticizer
- 7. Thermoplastic Weld Cortex KEE Membrane The Coreflex Overlap
- 8. Film Tear Bond - Membrane ruptures before weld separates
- 9. Then the concrete is poured on the membrane Underslab The membrane is installed with the BPA Core side up and the Thermoplastic side down with the seams welded.
- 11. The concrete is poured Plaza Deck The membrane is installed with the BPA Core side down and the thermoplastic side up with the seams welded.
- 15. Backfilled Walls A termination bar fastens the membrane to the precast foundation wall The membrane is then heat welded below the termination bar
- 17. Lagging / Property Line CoreFlex Disc
- 18. Leak Isolation Leak Isolation – Self Healing Welded thermoplastic membrane provides a monolithic, hydrostatic ``` resistant barrier over the entire surface If Welded thermoplastic membrane is breached, BPA Core stops leaks from ``` migrating to defects in the concrete
- 21. Thermoplastic Membrane Side-Down Positioning Welder to Start
- 22. Seams are heat welded
Editor's Notes
- #4: Hydrostatic resistance of the thermoplastic layer is a key feature. The thermoplastic welds allow for optimum hydrostatic protection in the critical transitions and details. The membrane is unaffected by and protects the BPA from a large array of contaminants. If the membrane is punctured, the active BPA layer seals the leak and prevents the water from migrating to cracks in the concrete.
- #5: Weft inserted… Unique to the membrane industry. Not only is the fabric encapsulated, but the bond to the top and bottom membrane layers are exceptional.
- #6: KEE – Keytone Ethylene Ester
- #7: Unlike liquid plasticizers, Elvaloy is strongly bonded to the polymer chain. It does not have the affinity to break from the chain and migrate to other molecules external to the membrane. Clays, oils, animal fats, fuels and organic substances can render traditional PVC membranes as inflexible and brittle as schedule 40 pipe. Flexibility and all the other properties that are desirable in a waterproofing membrane are useless if they change over time. Elvaloy not only protects the membrane from environmental and jobsite conditions when first installed, but remains stable, and in place for the duration.
- #8: Step one – make the overlap (4” consistent from end to end) Step two – peel the membrane from the Cortex on one side Step three – tuck the un-peeled sheet into the pocket of the one you peeled Step four – fabricate the weld Step five – check the weld
- #16: This application will work best from the bottom up, but can be installed top down at the contractors discretion. Either a term bar or discs can be used to hang the membrane. The CoreFlex Overlap is constructed, the membrane is fastened and the KEE membrane overlap is fabricated with a thermoplastic weld; encapsulating the fastening elements, resulting in a monolithic Active/Passive envelope.
- #18: The pattern can vary. But a good starting point is every 3.5” in both the vertical and horizontal planes. This pattern allows for making the CoreFlex overlap and welding the membrane at the horizontal seams. Depending on the horizontal run, the contractor may need to adjust a vertical spacing so the discs do not fall on the butt-end overlaps.
- #19: The BPA layer, when hydrated prevents water from migrating between the membrane and the concrete. Membranes by themselves can not prevent this migration, even adhered membranes as the moisture and pressure will eventually defeat the bond. Self healing and leak isolation go beyond what any other system offers; unless you go to a redundant system applied in two or more steps…at a higher installed cost.
- #23: The membrane is easy to weld, and the procedure set out in the Welding/Overlap Tech Data will insure not only a good weld, but a successful overlap. It is important to not only make the overlap, but protect the BPA in the welding process. It is simple with the right equipment & techniques.