b'Types of ShimsIt really doesnt matter which type of anchor you useor what type of shim. The key is to be able to makethe adjustment before you anchor the windows andprovide solid support between the frame and theopening behind the anchors.The most common type are tapered wood shims.These are better versions of the wood shake cut-offsimproperly used by poor installers. Pre-cut woodshims have a consistent taper and fit in smallerplaces. The downside is that they are tapered andmust be used in pairs. Also, to effectively use atapered shim, it often needs to go beyond the depthof the window frame, and that is not possible formany replacement applications.A better solution is stackable plastic shims These canbe U shaped or horse shoe shaped with snap offlength adjustment so they fit. The handle can thenbe broken off when final trim is applied. Also, plasticshims will not deteriorate in moist conditions whichcan be a real plus.Win-Bag is an inflating bag that when placedbetween the window frame and the rough opening,allows minute adjustments before anchoring andbefore final, solid shims are added. The product haswide use in the U.S. as a method to pry open cardoors to unlock them, Win-Bag and other similarproducts are used extensively in Europe to centerwindows and doors in their openings. Many profes-sional window and door installers use them becausethey are simple, precise, and can fit in the smallestspaces.Once the window frame is plumb, level and square,anchors are installed with wood or plastic shimsadded for support behind the anchors and the airbagshims are deflated and removed.Window Fitters Guide to Window Installation62020 AWDI, LLC Do not reproduce without permission'