Old Window? 10 Tips for Improving Performance
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As I was hosing down the dirt driveway in front of my house last week to keep the dust down with some guests due to arrive, I got to thinking about Chicken Dinner Road. I once lived in Canyon County, Idaho and often passed a junction for Chicken... An air-sealing upgrade and repair package for the existing window can be the place to start. Professional air sealing and repair may involve replacing seals and gaskets throughout the window assembly, replacing double-paned glass or entire sashes if necessary, bringing window frames back into square, and repairing sash frames or the glass itself. While these repairs can be fairly cost-effective (if not always inexpensive), they do not add much R-value to the window--though replacing a sash pocket pulley system with a spring system and filling the air space with insulation will provide marginal improvements. Combining approaches for better thermal performance Air sealing does save energy as well as improve thermal comfort by closing off air leaks and reducing drafts, and it can be combined with high-performing storm windows or insulated shades to get up to four times better thermal performance without a pricey window replacement--a great option if you need shades for glare or privacy anyway, or if maintaining the look and feel of original windows is important. Improved operability can also save energy by allowing windows to be opened in the summer for ventilation. "The only reason to replace a window is complete deterioration," says Jean Carroon, an architect with Goody Clancy in Boston. Carroon specializes in historic preservation, and her work often leads to extensive restoration and repair of historic windows as well as the addition of attachments like interior panels--or even replacing windowpanes with insulated glass units in the historic window frame. Most of today's windows can't be repaired Carroon is distressed by the rate at which windows are replaced, especially since most of today's double-glazed, low-e windows cannot be repaired. (I have learned this the hard way, naively taking one such broken window into the local hardware store, and then to the local glass repair shop, before finally taking the numbers off the unit to order a replacement from the dealer.) Installing non-repairable windows leads to a "cycle of replacement" and is "a symbol of a non-sustainable world," Carroon says. While restoring windows can be labor-intensive (and thus expensive), "you are almost always pouring the dollars into the local economy," not sending it to far-away manufacturers, she notes. Ten tips for deciding how to handle old windows Here are some tips on deciding what do to with old, under-performing windows: Replace existing windows only if they have failed or are in poor shape. Almost all windows need attachments, and opting for a higher-performance attachment, rather than a window replacement plus a new conventional attachment, may be a better solution. Get a handle on the entire spectrum of possibilities from the last two weeks' columns (on keeping the sun out , and on keepimg the heat in ), and by reviewing WindowAttachments.org , and then prioritize your needs. Using these priorities, compare how well conventional window treatments meet these needs in comparison with more expensive but higher-performing window attachments. Use the individual window attachment fact sheets (also at WindowAttachments.org ) to gain a complete understanding of each option. Look for and use credible resources--not manufacturer or sales claims--to support your window attachment decision-making. Two such resources are RESFEN and WINDOW 6.3--free, downloadable software tools. Select an attachment with multiple attributes; sometimes one attachment can solve multiple problems. At the same time, understand that optimal management of heat loss and gain may require two window attachments--an interior one for the former and an exterior one for the latter. Take care in combining double-glazed low-e windows with either low-e exterior storm windows or high-performance insulating interior attachments; deployment of either in managing solar gain during the summer may result in damage to the insulated glazing unit seals. Understand what the proper maintenance will be for your attachments, and any operational needs. Awnings will work only if opened! Prioritize energy performance in your window attachment decisions, but don't forget to seek out nontoxic materials. While some window attachments typically come in only one form, the market is expanding rapidly. Recycled content, low-emitting materials, non-treated fabrics, and other green options may already be available. More resources--and versions of the story As with other recent columns, check out Making Windows Work Better, by Paula Melton and Peter Yost. That's the recent feature article from Environmental Building News, and offers more detail on today's advice along with other more comprehensive information. Back to that chicken dinner: An online article tells me that one family on the fabled road back in the 1930s was friendly with the governor. They had him over for a nice chicken barbecue, and buttonholed him about the road. He agreed to keep it oiled if the county would grade and gravel it. The county agreed on it, and a legend was born. Tristan Roberts is Editorial Director at BuildingGreen, Inc., in Brattleboro, Vermont, which publishes information on green building solutions. Chicken Dinner Road photo by Bold Little Swallow, some rights reserved.