planning:refurbishment_with_passive_house_components:windows_in_a_step-by-step_retrofit

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planning:refurbishment_with_passive_house_components:windows_in_a_step-by-step_retrofit [2016/09/28 14:05] francis.bosenick@passiv.deplanning:refurbishment_with_passive_house_components:windows_in_a_step-by-step_retrofit [2016/09/28 14:11] francis.bosenick@passiv.de
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 If the window is in good condition and insulation over the casement is to be used as recommended in Section 3.2 in order to extend the window’s service life, the glazing can be replaced with triple glazing. This option is particularly possible with timbered windows. To reduce weight and avoid unnecessarily putting an additional load on the frame, partly pre-tensioned thin-layered panes should be used. A 3/x/2/x/3 (3 mm of glass outside, 2 mm inside) pane design is recommended. The new glass will then be exactly as heavy as the old. The old glass generally has two panes with a thickness of about 4 mm each; along with 16 mm of space between the two panes, the total is 24 mm. In terms of thermal quality, the optimum for glazing filled with krypton is 8 mm of glass + 2 x 12 mm of space between the panes for a total of 32 mm. Generally, this should be possible if the old window’s pane-holding strip is reduced. Krypton, however, is much more expensive than argon, and also the losses at the glass edges are much lower if the gaps between the window panes are larger. The optimum for argon-filled glazing is 8 mm of glass and 2 gaps of 18 mm between the panes for a total of 44 mm. For such glazing for a standard IV 68 window, the pane-holding strip should be reworked as shown in Figure 6. The airtight connection between the old frame and the new glass should be made by using an adhesive tape that is as diffusion-tight as possible so that condensation does not build up as so often happens with these old windows, thereby preventing the frame from rotting and extending the window’s service life. When the glass is renewed, old sealants can also be replaced if necessary. If the window is in good condition and insulation over the casement is to be used as recommended in Section 3.2 in order to extend the window’s service life, the glazing can be replaced with triple glazing. This option is particularly possible with timbered windows. To reduce weight and avoid unnecessarily putting an additional load on the frame, partly pre-tensioned thin-layered panes should be used. A 3/x/2/x/3 (3 mm of glass outside, 2 mm inside) pane design is recommended. The new glass will then be exactly as heavy as the old. The old glass generally has two panes with a thickness of about 4 mm each; along with 16 mm of space between the two panes, the total is 24 mm. In terms of thermal quality, the optimum for glazing filled with krypton is 8 mm of glass + 2 x 12 mm of space between the panes for a total of 32 mm. Generally, this should be possible if the old window’s pane-holding strip is reduced. Krypton, however, is much more expensive than argon, and also the losses at the glass edges are much lower if the gaps between the window panes are larger. The optimum for argon-filled glazing is 8 mm of glass and 2 gaps of 18 mm between the panes for a total of 44 mm. For such glazing for a standard IV 68 window, the pane-holding strip should be reworked as shown in Figure 6. The airtight connection between the old frame and the new glass should be made by using an adhesive tape that is as diffusion-tight as possible so that condensation does not build up as so often happens with these old windows, thereby preventing the frame from rotting and extending the window’s service life. When the glass is renewed, old sealants can also be replaced if necessary.
 +
 +[{{:picopen:fig_6_win.png?600|Figure 6: Old window frame (left) with new triple glazing (right)}}]
 +
 +===== 4. References =====
 +
 +|[Krick 2015]|Krick, B.: Component Award for Passive House Windows: comfortable, profitable, innovative, and future-proof. In: Feist, W. (editor): Proceedings of the 19th International Passive House Conference 2015 in Leipzig, Passive House Institute, Darmstadt, 2015.|
 +
planning/refurbishment_with_passive_house_components/windows_in_a_step-by-step_retrofit.txt · Last modified: 2016/09/28 14:13 by francis.bosenick@passiv.de