b'Replacing Old PVCPocket WindowPocket Replacement Windows have been popular formore than 50 years and as good as many of todayspopular brands are, there are also many that havenot weathered very well - especially earlier ones madewith inferior uPVC and thin wall extrusions.Early Vinyl Replacement Windows were mechanicallyfastened which warped and leaked air, These earlyvinyl windows followed the design and fabrication Old Mechanically Fastened Framesmethods of the aluminum replacement windows thatpreceeded the rise of PVC frames. Some wereDetailed in this section is a simple methods toside-load with even less weatherstripping remove the old pocket windows and place a modernenergy efficient model in its place with minimum dis-Early glazing systems did not stand the test of time turbance damage to the old wood frame.with an average life before seal failures fogged theglass. Finally, early window systems have beenCaution: It is very important after removing the oldabandoned in favor of more robust and energypocket window to check the old window frame whereefficient designs making spare parts hard if not the new window will go. Probably only the oldimpossible to find. replacement window failed, but if water penetratedaround the old replacement window it might haveToday there is a growing need to replace the old started rot, mildew or other damage that should bereplacement windows. The good news is that it is carefully assessed to mitigate the problem and treatpossible to remove windows installed in the left-in- the receiving wood frame to avoid further damage. Inplace sash pockets of the old wood double hungextreme cases, the old wood window may need to bewindows that were replaced. completely removed down to the rough framing(Frame-Out Replacement) as detailed elsewhere inReplacing old Pocket Vinyl Windows is an excellent this book. opportunity to upgrade the install by redoing oldinside-out installs with better outside-in installs Bottom Line: Care is necessary to make sure theeliminating the need for a head expander andcomplete weather barrier of the window/openingapplying new and more weather-tight exterior trim. joint is complete.Condensation Warped Frame Glass FailureWindow Fitters Guide to Window Installation502020 AWDI, LLC Do not reproduce without permission'