There’s always so much to learn at GANA conferences. If you missed the Fall Conference, or didn’t make it to all the sessions you wanted to, here’s a recap of highlights to supplement my last two posts. Of course, for specific coverage, GANA’s website offers members the opportunity to access the meeting minutes from each of the divisions.
In the Insulating Division, Jon Kimberlain reported about cold forming insulating glass units, and what possible stress the glass and/or the glass edge seal would be under if the glass were, for lack of a better term, warped when placed in the frame. They looked at a full size glass lite first in a computer-generated model called finite structural analysis, seeing if there were any flaws when loaded to 100 psf when bending the glass in 2-inch increments. They then physically tested a specimen to validate the finite model analysis. They took the physical testing to 8-inch deflection of one corner of the insulated glass without showing any stress in the edge seal under accelerated weather seal testing.
GANA’s going to join up with Insulated Glass Manufacturers Association (IGMA) to work on any changes to glazing insulating glass units that are only supported on two edges. Presently, most of the fabricators require all four edges to be supported by framing. We’re seeing instances where architects and consultants are allowing construction without framing on two edges. This has implications for how that glass is supported for dead load (and where the setting blocks are located) when the architect wants the glass supported only on the vertical edges. The GANA Annual Meeting next spring will be in conjunction with IGMA, so there should be more developments to report on at that time.
PIB (polyisobutylene) sealant migration is on-going issue. There was no consensus yet about the cause. Is it a chemical failure of the primary seal of the spacer? Or, if it’s a squeeze-out issue, is the tried-and-true rule of 4-10 psi edge pressure to affect gasket sealing in captured glazing up for discussion, possibly fine tuning it if the pressure put on the edge of the glass is found to be the cause?
The reflected energy issues, most notably those concerning building materials in close proximity to coated glass (think North Carolina’s recent restrictions on the use of Low-E glass) will lead to a GIB to address those issues.
The Tempering Division continues to discuss how to measure wave distortion. Using the dioptric measuring system (it’s what ophthalmologists use to write prescriptions for glasses) may be a more accurate form of measurement than the one presently used. The amount of distortion that’s acceptable depends on the distance and angle of incidence – varying those factors changes the perceived distortion. Software now can filter or indicate the amount of distortion that might be visible, but the settings can lead to misleading projections of the predictable distortion. If one sets the limits too low, you might see a lot of distortion, or conversely, if they’re set too high, no distortion might be indicated. Working with the fabricators for predicting distortion is still a wise strategy.
Ceramic frit weakening glass for wind load is still out there as an ongoing open issue. But, no consensus is forming whether this is something the industry is taking a serious look at or not. Megan Headley at USGlass Magazine is looking for input if you have examples of where this has occurred on projects. As would the folks at ASTM E1300 subcommittees that are looking into this.
The certification of the industry is still in its infancy, but seems to be gaining some traction. Two strategies appear to be forming. First, the NACC folks seem to be approaching certification of companies, which takes the tack of looking into their performance practices, safety record, financial stability, quality control processes, administration (contract compliance, communication, etc.). The other approach is to certify individuals through vehicles such as AAMA’s “Fenestration Masters” program. GANA is considering joining with that program to add a glass component, adding GANA manuals (Glass, Sealant, PM, and Estimating Manuals) to the core curriculum.
Laminam, a fabricator of porcelain panels made a presentation of their materials. They’ve glazed large panels (63-by-126 inches) into structural silicone and captured glazing, with geometric or natural material patterns impregnated into the surface, creating a product with a 35-year warranty on color fade. It’s a thinner alternative to stone, which might have some merit.
Apologies for not wrapping up the report for GANA Fall Conference last week. There was this little parade in Downtown K.C. with 800,000 other Royals fans. My luck has never been to be in town when the local team won a championship trophy, but that’s another story for another time. So, I wasn’t going to miss this one. Even better was me making off with some of Paul Bieber’s money. I haven’t heard from Lyle Hill yet if he wants the same bet for next year after he predicted his Cubbies would be there. Lyle?
Finally, thanks to the folks at the Washington Glass Association for allowing a review of Fall Conference at their meeting last month. Good crowd, nice reception. Just one comment: Rick Wakefield should work on his introductions a bit. The liberties he took…I’ll let him explain, but no permanent harm came from it; all in good fun. It was great having a chance to review the conference with those who use the manuals, GIBs and standards GANA’s various divisions develop. Lots of good feedback; thanks WGA!