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Top-Performing Triple-Glazed Skylight From Wasco

by LiveModern Webmaster last modified Jan 04, 2012 02:04 AM
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by Alex Wilson last modified Jul 22, 2010

Wasco offers a new high-performance , triple-glazed, dual-low-e skylight that meets the 30-30 requirement for the federal tax credit. Photo: Wasco Products. Click on image to enlarge. Wasco Products of Sanford, Maine, has raised the bar on energy... I love the 0.30 U-factor requirement for the tax credit. That's a level of performance that, at least for skylights, can't be achieved simply with double-glazing, a low-e coating, and argon gas-fill. To reach this level of performance (remember, the lower the number the less the heat loss), triple-glazing, multiple low-e coatings, or a lower-conductivity gas than argon is required. Thus, the requirement really pushes the industry. And a few companies have responded--such as Wasco. While I like the 0.30 U-factor requirement for all windows, I've been critical of the "one-size-fits-all" tax credit requirement for a SHGC of 0.30 or lower. This level of SHGC performance makes sense for a lot of window applications, but it makes it difficult to benefit from passive solar heating (see my previous blog on this issue). But it's a different story for skylights, which are usually installed in the roof plane, because unwanted solar heat gain is a much greater concern. For skylights, the 0.30 SHGC performance makes a whole lot of sense. Thus, I was very excited to see the Wasco Triple Glazed 30/30 glazing option introduced earlier this year. It's a great product. More detail An advanced low-e coating is used on the #2 and #5 surfaces of the triple-glazed unit, and argon fills both spaces. Image: Wasco Products. Click on image to enlarge. The triple-glazed 30/30 skylight has two low-e coatings: one on the #2 surface and another on the #5 surface (with glazing, surfaces are numbered from the outside in). These aren't standard low-e coatings, but the latest low-e from Cardinal Glass that has a triple coating of silver to improve energy performance over the low-e2 (squared) product that has been the standard low-e for the past 15 years of so. Wasco calls this coating eMAX3 (cubed). Both of the inter-glazing spaces in the triple-glazed 30/30 skylights are filled with argon to further improve performance. Total insulation performance with this glazing option is 55% better than that of standard skylights with double-glazed, clear glass. In addition to the U-factor and SHGC properties noted above, this skylight blocks 95% of fabric-damaging ultraviolet light. Yet it provides a very respectable visible light transmittance of 43% (fixed models) or 42% (venting models). This means that daylighting from the skylight and views through the skylight will be very good. Wasco Products also offers a diffusing skylight in which the space between the layers of glass is filled with Nanogel, a silica aerogel product from Cabot Corporation . Unique properties of silica aerogel result in very high energy performance, with an insulating value of R-8 per inch. For more information: Wasco Products, Inc. Sanford, Maine 800-388-0293 Alex Wilson is the executive editor of Environmental Building News and founder of BuildingGreen, LLC . In addition to this product-of-the week blog, he writes the weekly Energy Solutions blog. To keep up with his latest articles and musings, you can sign up for his Twitter feeds . Products covered in his product-of-the-week column are--or soon will be--listed in BuildingGreen's GreenSpec Directory . See more on this product in the GreenSpec Guide






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