Masonry Magazine December 2008 Page. 29
A minimum on their requirements, and that is that flashing comes at least out flush to the outside face of the brick.
The flashing industry is responding to that requirement. Extending material beyond the face of the brick is normally done with a metal drip edge or some type of drip edge material. Because of the requirement of getting it flush to face, if that's the chosen method, you need to look at materials that are UV stable and can be left exposed permanently without any kind of negative to the material or to the wall's visual impact. In addition, care to match either the brick color or the mortar color makes the drip point less noticeable, and that makes the architect happy.
"Asphalt-based products or an asphalt-coated copper material are problematic," says Bupp. "If you try to bring it to the face of the brick, the asphalt might actually heat up enough that it could liquefy and, potentially, bleed out of the joint and down the face of the building. So, our industry is looking at things like clear adhesives that have much higher melting points, so that it's not an issue."
Clear-coating systems that go over copper material are other options. Another concern with asphalts, Bupp says, is staining, if you're using light-colored masonry as a veneer material.
"That's one of the areas, from a product standpoint, that we see changing," Bupp says. "We've developed clear adhesive products with melting points near the 400-degree Fahrenheit mark, so there's never a concern about the material actually liquefying and bleeding out. I think that's an advantage, and the fact that it's not asphalt eliminates the staining issue. We think that's a step in the right direction."
Another subtle change is slowly happening: the development of more easily installable products. "One of the products that we see used a lot is a peel-and-stick flashing that actually has a built-in adhesive," says Bupp. "It just makes life a lot easier for the contractor to be able to slap pieces together, detail inside and outside corners, and create watertight areas around door and window openings."
TEXTROFLASH™ GREEN
NON-ASPHALT
PEEL-N-STICK
FLASHING
1.) NON-ASPHALT PRESSURE-SENSITIVE COATING REMAINS AGGRESSIVELY STICKY EVEN AT TEMPERATURES AS LOW AS 25° F.
2.) PAIRED WITH OUR TEXTROFLASH 36 WATER-BASED PRIMER, TEXTROFLASH INSTALLS EASILY. IN INSTANCES OF LOW-TEMPERATURE APPLICATIONS, TEXTROFLASH IS SUPERIOR TO OTHER PEEL-N-STICK PRODUCTS AS IT RETAINS IT'S STICKINESS IN VERY COLD CLIMATES.
3.) TEXTROFLASH AND TEXTROFLASH 36 PRIMER ARE MADE FROM NON-LEACHING COMPOUNDS THAT WILL NOT CONTRIBUTE TO JOBSITE CONTAMINATION IF EXPOSED TO THE ELEMENTS. THE MEMBRANE ITSELF HAS MORE UV PROTECTION THAN EVER BEFORE, ALLOWING LONGER EXPOSURE TO THE ELEMENTS IN CASE OF DELAYED CONSTRUCTION OF THE OUTER MASONRY WYTHE.
4.) PRICED TO COMPETE WITH ANY COMMERCIALLY AVAILABLE PEEL-AND-STICK MEMBRANE.
JUST RELEASED!
HOHMANN & BARNARD'S
FLEX-FLASH DRIP EDGE
H&B'S FLEX-FLASH DRIP EDGE IS A 45-MIL THICK PRODUCT FORMULATED WITH ELVALOY ΚΕΕ
COLORS AVAILABLE:
RED ALMOND BROWN
WHITE TAN-GRAY
www.h-b.com/ffdripedge
U.S. Pat. No. 6,584,746 Other Patents Pending
Elvaloy is a registered trademark of the DuPont Company.
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