Volume 39, Issue 10, October 2004

DearUSG

Vinyl Can and 
Does Meet L/175

Dear USG,
In the article titled “Behind Closed Doors: AAMA Task Group Discusses the Future of L/175,” the last two paragraphs infer that vinyl window companies cannot meet the L/175 performance level (see the August 2004 USGlass, page 24). It was stated that vinyl window manufacturers probably could meet L/175.
Well, I am here to confirm that it is not a “probably.” We at L.B. Plastics have satisfied this standard for years with several of our systems. These systems run the full spectrum of low-cost, single-hung new construction and double-hung replacement units to our high-end, double-hung systems. These systems consistently meet the L/175 parameter for grades of 60, 70, 80+. Importantly, these results are not for small windows, but windows with substantial size. If anyone is interested in more details we would be happy to discuss.
I would only hope that you would clear up this matter and give full credit to the integrity of vinyl windows.
Dave Byers
Manager, Window and Door Division
L.B. Plastics
Mooresville, N.C.

The Power of the People
Dear USG,
It was a pleasure and an honor to be included among the most influential people of the glass and metal industry as per your recent article, “Who’s Got the Power?” published in the August 2004 issue of USGlass (see the August 2004 USGlass, page 30). I truly enjoyed the photo of me next to an airplane. It was very appropriate and quite funny.
Thank you again for including me as one of the major voices of the industry in this bi-annual listing.
William O’Keeffe
Chief Executive Officer
SAFTI Fire-Rated Glazing
San Francisco

Good Design 
Gets Results 
Dear USG,
We were recently invited by a building owner to perform a due diligence inspection on a 50+-story building in downtown Houston. After visiting the site we realized that we were the original designers of the exterior curtainwall construction. We were further pleasantly surprised to find the excellent condition of the exterior of the building due to regular maintenance. This shows that a good design with consideration of all the necessary elements within the building envelope (from all materials, structural movements and thermal effect on all elements) pays off in the long run with minimal maintenance. After 22 years of exposure to the Houston climate, there are no leaks on the building, no fogged insulating glass and practically no failed sealant joints anywhere.
In retrospect, I have to give credit to the original owners for allowing us to design the entire skin without requiring any compromises for the sake of value engineering or quality-control issues. The results prove themselves in the longevity of this building skin, contrary to many other buildings that we have inspected over the years that have required many types of remedial work. There is certainly no guarantee against any kind of damage caused by moisture, leakage or condensation trapped within the wall system that can cause future maintenance and required repairs for fixing anchors, etc.
Peter M. Muller
Curtainwall Consultant 
Houston 


USG

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