Low-emissivity Glass

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Author Message Jerome J. Lazar, RA, CCS, CSI, SCIP Senior Member Username: lazarcitec Post Number: 1020 Registered: 05-2003 Posted on Friday, December 13, 2013 - 05:02 pm:    I've been asked what is Type 4 Low-e Glass? I've researched low-e glass and can find no reference to types. Help please. David G. Axt, CCS, CSI ,SCIP Senior Member Username: david_axt Post Number: 1340 Registered: 03-2002 Posted on Friday, December 13, 2013 - 06:34 pm:    Jerome, I think that you are referring to the "surface" of the Low-E coated glass. The surfaces are numbered from the exterior of the window to the interior of the window. So the exterior face of the glass that gets rain is Surface #1, followed by Surface #2 that is inside the air space on the same pane of glass. Then Surface #3 that is still in the airspace but on the other pane of glass. Then finally Surface #4 that is inside the room where people can touch it. This might help: http://www.climaguardglass.com/ProductSolutions/Energyefficientproducts/ClimaGuardIS/index.htm There are coating that can be applied to Surface #4 in addition to Surface #2 in order to further improve the energy efficiency of the window unit. Here is another manufacturer: http://www.pilkington.com/north-america/usa/english/products/bp/bybenefit/thermalinsulation/energyadvantage/low-e+4th+surface+technology.htm David G. Axt, CCS, CSI, SCIP Specifications Consultant/Web Publisher www.localproductreps.com Steven Bruneel, AIA, CSI-CDT, LEED-AP, EDAC Senior Member Username: redseca2 Post Number: 424 Registered: 12-2006 Posted on Friday, December 13, 2013 - 06:39 pm:    I don't know of "Type 4" being a recognized term for a type of Low E glass. Perhaps it is used by one of the manufacturers who provide the coating. Or the person asking you found it on documents for another project and it is simply that Architect's naming convention for the glass for that project. Sometimes things like that evolve into campus standards. Or even more off course, it means that the Low E coating is on the number 4 surface, the interior side face of an IGU or laminated glass unit. Jerome J. Lazar, RA, CCS, CSI, SCIP Senior Member Username: lazarcitec Post Number: 1021 Registered: 05-2003 Posted on Friday, December 13, 2013 - 07:10 pm:    Thanks David & Steven, great last minute save (of face). J. Peter Jordan Senior Member Username: jpjordan Post Number: 655 Registered: 05-2004 Posted on Saturday, December 14, 2013 - 08:39 am:    I concur with the previous comments. You should also be careful about the type of coating. The most common coatings are the "sputter" or soft coatings which should not be left exposed to touch or cleaning. These are applied after the glass has been manufactured and are offered by PPG, Guardian, and Viracon. Pyrolitic coatings are "hard" coatings that are much more durable, but don't have the performance of the sputter coatings. Pyrolitic coatings are applied during the glass manufacturing process and are offered by Pilkington.