b'Empty CavityBetween OldFrame andRough OpeningInsulating the Frame andSash PocketsThere are 3 major performance problems associated withold windows and doors. Convection, Conduction andRadiance are usually well handled by replacing the oldoperating window or door with a modern, well manufac-tured new window with high performance glazing.The real culprit, in most poorly performing old windows, isair infiltration. It is well documented, that a crack, 1/16,around the perimeter of the old sash or the old windowframe will cause drafts, and the feeling of cold as if therewere a hole in the wall the size of a brick. 10 windows ormore, and the hole is like 10 bricks, and that can make acold winter day feel unbearably cold and drafty.Too often, replacing olddrafty windows withnew, high efficiencyreplacement windows,doesnt change muchin the way of draftsand comfort. In fact,the air-tight replace-ment window magni-fies the air leaksaround the new window. Uninsulated sashpockets and windowframe cavities are thenumber one complaint.The new window maybe well insulated butthe hidden spacebetween the old window frame and the rough openingneeds to be insulated if the replacement is to succeed.Window Fitters Guide to Window Installation122020 AWDI, LLC Do not reproduce without permission'