Masonry Magazine June 2012 Page. 34
FLASHING
Completely bonded by hot air. I understand that "heat welding" may be a new term to some, but the simplicity of the effort gives unbelievable results.
In a demonstration that I performed for Tom Sourlis, owner of Mortar Net USA Ltd., we heat-welded a two-foot section of TPO in just a minute or so, and water tested it several minutes later with positive results - no leaks. Low-cost equipment for heat-welding can be purchased for under $100 and would reduce the sealant requirements for installing flashing by ½ to 10.3-ounce tube per lap. Unprimed polyethers and polyurethanes cannot be used for sealing this membrane, as surface energy of the membrane will not allow a durable, long-term bond.
Ethylene propylene diene monomer (EPDM)
EPDM IS ANOTHER ROOFING crossover material that has entered the masonry industry during the last several years. EPDM is flexible and easy to cut, and will easily install as it has little memory to the roll in hot or cold temperatures. EPDM is a rubber that responds well to certain polyethers and butyls as a lap sealant and general installation sealant. It is not compatible with PVC-molded corner boots or end dams. EPDM must have similar EPDM components for terminations and corners applications, and it is compatible with most air barriers on the market.
Other improvements in the flashing industry include the advancement of unitized flashing solutions. Unitized flash-
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