b"Cut Out Old Window, Leaving the FinVery often, the oldStep 1:window is cut out -through the old fin - Using a reciprocal saw,leaving the fin in place. cut the old window outThis is very common without disturbing thewhere J Channelexterior.was used to trim outthe siding. The goal isto leave as much of theexterior and interiortrim in place andpatch/repair. If done with care, thenew window, a boxframe window, can beinserted in the openingand trimmed with min-imal damage to theexisting opening.This would work if the exposed space between the siding and the interior wall board, containing the original flashingand insulation, is isolated from water intrusion, and accommodating drainage of any water or mois-ture condensation in so that it will not collect in theopening cavity. The best approach is to use a linerand seal behind/under the liner.Step 2: Step 3:After removingYou can line the the window, do your opening with waterbest to clean the gap, resistant pvc triminjecting a small bead board and mount of foam behind the the window or use asiding. You can wrap pre-extruded linersome flashing over the with built-in exteriorgap. Try to direct any stop, as shown*, andwater from going finish with drip capbehind the siding. and sealant.*Imperial Plastics jamb linerVES3BF illustratedThe Contractor's Guide to installing Vinyl Windows442020 AWDI, LLC Do not reproduce without permission"