Replacing Windows in Concrete Block and Stucco (CBS) Applications Replacement applications in Coastal Regions will be for windows installed in block walled homes with Stucco finish, and standard wood frame constructed homes with vinyl, wood, aluminum siding or brick or other masonry veneer finish. There are unique conditions for stucco over wood frame and stucco over concrete block construction. Some conditions of stucco finish on wood frame are covered in the “Jump Frame” section and applications where the stucco is cut back removing a window with brick mould and the new product is installed with a wood block installed over the mounting fin of the new window and the resulting assembly is installed in the opening and sealed to the remaining stucco finish. The conditions and instructions covered here will apply primarily to building constructions considered CBS (Concrete Block Stucco) and wood frame with similar stucco finish. Stucco covers the edge of the Old Window Because the original construction had the stucco finish applied after the window or door was installed, the stucco often will partially cover the flange of the old window. This creates problems that must be dealt with: Measurement, Removal of the Old Window, and Finish of the New Window. 1. Measure- It is difficult to measure for the new window because so much of the old window can be hidden behind the exterior stucco finish and the interior wallboard and/or sill finish. The new window cannot be too large or too small, for obvious reasons. The success of the job can be made or broken with proper measure or improper measurement. 2. Removal of Old Window- When removing the old window, it is problematic because the stucco needs to be kept out of the way of the removal, but damaging the stucco can require costly and difficult stucco repair, which almost never can be matched to the old finish – making for an unsightly exterior finish. The interior wallboard and sill, if damaged, can also require difficult and costly repair and/or replacement of components. 3. Finish of the New Window- Once the new window is installed, the exterior needs to be finished to create a weather barrier that repels entry of water, moisture and air, and the interior needs to be returned to a decorative state as good or better than existed with the old window. The mistake too often made is to order a window too small for the opening, and/or ordering a window that needs the mounting flanges cut off in order to make it fit in the opening, but rendering it impossible to properly seal it on the outside and trim in on the inside. Window Fitters Guide to Window Installation 134 ©2022 AWDI, LLC Do not reproduce without permission SAMPLE MANUAL
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