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HomeMy WebLinkAboutHDC2010-005 Staff Report, Description And Guidelines, Photos Of The Storm Window Being Installed.PROBLEM #19: Storm windows in general CURRENT STATUTE LANGUAGE: No text specifically addressing this issue. CURRENT ORDINANCE LANGUAGE: No text specifically addressing this issue. CURRENT GUIDELINES LANGUAGE: Page 52 of the Guidelines states: Screen and Storm Windows: Screen and storm windows should be wood or baked -on enamel or anodized aluminum in dark colors and fit within the window frames, not overlap the frames. Screens should be full -view. Storm windows may also be mounted on the inside of windows. Half screen and screen or storm windows smaller than original window, are not recommended. Problem #8 above has proposed to change the text to: Screen and storm windows should be wood or baked -on enamel or anodized aluminum in duelers, a color to match the window sash paint color and fit within the window frames, not overlapping the frames. Screens should be full -view. Storm windows may also be mounted on the inside of windows. Half screen and screen or storm windows smaller than original window, are not recommended. STAFF REPORT: The topic of energy savings has again moved to the forefront of renovations with the added tax credits for rehab and energy conservation tax credits passed by Congress that will give credits to many items that conserve energy from new appliances, new heat and air systems, insulation in your home, new replacements windows and storm Primary Air Infiltration Locations windows. Air infiltration is the culprit that Elect is oullats many of these home renovations are Fans and vents z A° Flaws. walls e and cdin+� attempting to thwart. Most homeowners 10% are assured that new windows will save them lots of money and will solve all of Do—, their air infiltration issues because the 11 window salesman told them so. However, as the chart to the right and the one below show, air infiltration by Plum. in windows and doors are ranked fifth and pene6ration� PW Firepiacm sixth of all air infiltration culprits. The 14% main offender in air infiltration in the Source: California Energy Commission home is floors, walls, and ceilings that account for 31 % of all air infiltration. After that is ductwork at 15%, fireplaces at 14% and plumbing penetrations at 13%. gy Lass ■ O]Lrr4ing �-ntrir-5 Source: U.S. Department of En Basically, air seeps though your walls, ceilings, and floors at a much greater rate than through your windows and doors combined. Adding insulation to your ceilings and floors can be done with no external change to the structure and not evoke the COA process. The insulation of walls can be more difficult, but can be achieved from inside or outside without a COA. Likewise, sealing the HVAC ductwork; inspecting and replacing or repairing the damper in your fireplace; installing expanding foam around plumbing entries; and sealing around fans, vents, and outlets can save energy dollars without a COA. For many years, people have been adding storm windows to their home. According to Paul Trudeau, (NAPC Staff) storm windows have been in existence for over 100 years. Before that, people protected the sashes of their windows through operable shutters. The addition of storm windows changed with the recent invention of vinyl (plastic) windows. The vinyl was cheap enough to entice people to replace the whole window unit instead of adding storm windows. The chart below describes energy savings and financial payback on window replacements. The chart assumes this is existing construction with single pane original windows in place. This chart was shown by Paul Trudeau at CAMP in September 2009 in Eldorado, AR. Starting on the left side of the graphic, a $50 storm window when combined with the existing window has a U-factor (efficiency factor) of .50. Your old wood window has a U-Value of 1.10. The lower the U-factor, the better. The energy savings is 722,218 Btu with an annual savings per window of $13.20. This simple payback will take 4.5 years. The next three examples show differences in the types of windows installed and the types of windows being replaced. This is annual energy savings as compared to the window it is replacing. The energy savings noted in this chart is not for new construction. For example, to replace your original window with a double -pane thermal window saves 625,922 Btu over what was there before. Your windows will be tight, but the cost will take 40.5 years to recoup the cost. By that time, a vinyl window will need to be replaced and the homeowner will be "underwater on their window mortgage." A more extreme example is to replace your original windows and storm windows with Low-e glass double pane thermal windows. That takes 240 years to recoup the cost of the windows. Also, note that the old windows go to the dump yard when taken out. The thermal seal in the double and triple paned windows are noticeable when they are broken as evidenced by the condensation in between the layers of the glass. Let Gorivir, $50` P0 U-Value �• } : -. Y' • •i Value e U-Value 0.58 0.35 0.35 $450* $550* $550* - twmbr sdl Original windm Original window Original window U.Value in landfill - in landfill and storm 0.50 , in landfill TUNE-UP STRATEGIES Lowe glass double pane Storm window Double -pane thermal Low-e glass double -pane thermal replacement of over single -pane replacement of thermal replacement of single -pane window original window single -pane window single -pane window with storm window ANNUAL ENERGY SAVINGS 722,218 Btu 625,922 Btu 902,772 Btu 132,407 Btu ANNUAL SAVINGS PER WINDOW-" $13.20 $11.07 $16.10 $2.29 SIMPLE PAYBACK 40.5 34 4.5 Years Years 240 Years*"" Years $50/$13-20 = v $450411.07 = $550/S16 10 = $5501$2.29 = "Cost of ?' R 5' window, Installod SOUrce: Keith i{eberern PT, R.A. "Assuming gas hsat aT S1.01%,Lherm Collmgswoud Historic Distncl Commission Source: Keith Habereern, P.E. R.A. Collingswood Historic District Commission The metal on storm windows can be painted to match the sash of the house before they are installed. Storm windows also come in different colors from the factory, mill (aluminum color), bronze and white are common colors. Painting your windows at the same time as installing the storm windows will provide a seamless installation that will obscure the presence of the storm windows as much as possible. It is also important to buy storm windows with full screens that mimic the older screens. On fixed windows, no screen is allowable, since no screen would have been there originally. On operable storm windows, the sash size must match with the original windows to provide the best results. Interior storm windows are an option that does not require a COA. Some research on the web provided professional companies along with do-it-yourself options. A DIY option Is at htt ://www.hammerzone.com/archives/ener /conservation/basics 1/window cover.htm. Toolbase Services has a list of manufacturers of interior storm windows at http:l/www.toolbase-org/Techlnventor/TechDetails,as x?oontentDetaiIID=938. Climate Seal promotes interior storm windows that have a "refrigerator like seal' that has a magnetic attachment system described at the website below. http:/Yv,fww,climateseal.com/preservation window inserts) reservation window inserts.mrn- All of the interior storm windows that were located on line are removable during mild weather days to allow the opening of the original windows. Below are two graphics that show interior storm windows. The energy savings calculated in the graphic above are based on exterior storm windows, not interior storm windows although U-Values are thought be similar. ..r tRUIPP", 11 .�� I - . - - This shows a person removing an This shows the interior storm window installed. It is placed interior storm window. vertically against the lower sash in this phofQ- Below are the applicable Secretary of the Interior Standards for storm windows and replacement windows. 2. The historic character of a property shall be retained and preserved. The removal of historic materials or alteration of features and spaces that characterize a property shall be avoided. 5. Distinctive features, finishes and construction techniques or examples of craftsmanship that characterize a property shall be preserved. 6. Deteriorated historic features shall be repaired rather than replaced. Where the severity of deterioration requires replacement of a distinctive feature, the new feature shall match the old in design, color, texture and other visual qualities and, where possible, materials. Replacement of missing features shall be substantiated by documentary, physical or pictorial evidence. 9. New additions, exterior alterations, or related new construction shall not destroy historic materials that characterize the property. The new work shall be differentiated from the old and shall be compatible with the massing, size, scale, and architectural features to protect the historic integrity of the property and its environment. 10. New additions and adjacent or related new construction shall be undertaken in such a manner that if removed in the future, the essential form and integrity of the historic property and its environment would be unimpaired. When the Secretary of the Interior Standards are applied strictly, no replacement windows are installed in the district. The addition of storm windows is completely reversible, as standard number 10 requires where as a replacement window is not. The education of the public needs to enforce the facts that replacement windows are not the end all to energy savings that they are purported to be, not on a financial level or an energy saving level. Maintaining the original wood windows with an appropriate interior or exterior storm window is acceptable to the HDC and the Secretary of Interior Standards.