Therefore it becomes necessary to measure the height of the opening in three places: once at each side, and once in the middle. Provide the smallest of these three dimensions accurately to the nearest 1/16-inch. Measurement of the width is handled the same as double-hung or sliders. Installation of the casement or awning window can proceed exactly as with a double-hung. In fact, substitution of casements or awning windows for a removed double-hung or slider can add a new architectural design look to any house. Installation Installation Screw Screw Caulking Caulking Caulking Caulking Window Fitters Guide to Window Installation 55 ©2022 AWDI, LLC Do not reproduce without permission As with any replacement, accurate measurement is the most important requirement to assure weathertight and trouble-free installation. Look over the instructions for measurement for the type of window that will be replaced and carefully measure and order the appropriate casement or awning window. Make note of any factory cut-backs and con- sider whether it is advisable to order exact sized or opening sized windows. There are three important considerations regarding Awning and Casement windows that make them different to install than double-hungs or sliders: 1. Casement and Awning windows do not use a head expander. 2. There may not be pre-drilled mounting holes in the window’s side frames for screws to anchor the window to the jambs 3. There is no sloped sill or drainage accommodations These conditions do not prevent easy installation but they are conditions which change the basic way Casement and Awning windows are installed. Blind Stop Installation Conventional installation for replacement windows calls for “Blindstop” installation where the new window is installed in the opening against the blindstop, the window is screw-anchored to the sides of the opening, and the interior stops are re-applied. Because the Awning and Casement window styles operate with a “swing-out” mechanism, a head expander would get in the way of the swing-out sash and spoil the appearance of the window. This condition requires some fundamental changes in the installation procedure. It is necessary to measure accurately and order carefully. Remember, there is no head expander to take up the extra space in the opening. Normally Double Hung and Slider replacement windows are factory ‘undercut’ 3/4-inch to 1-inch less than the opening height. This is done to accommodate the height of the stool (1/2”) the new win- dow must fit over as it is placed in the opening. Casements and Awnings still must be placed over the stool and set down on the sill. But, because there is no head expander supplied, the window will be routinely undercut at the factory approximately 1/4” less than the measured opening height. This causes the set-in process to become very snug and difficult. Careful measurement is extremely important so that the Casement or Awning factory manufactured height is at least1/4” smaller than the opening height, but no more than 3/8” smaller! If the height of the Casement/Awning window is smaller than 1/4” less than the opening height, it will not fit. If it is more than 3/8” less, the window will not fit the opening well enough to adequately seal out drafts and moisture. SAMPLE MANUAL
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