b'As with any replacement, accurate measurementTherefore it becomes necessary to measure the height ofis the most important requirement to assurethe opening in three places: once at each side, andweathertight and trouble-free installation.Lookonce in the middle. Provide the smallest of these threeover the instructions for measurement for the typedimensions accurately to the nearest 1/16-inch.of window that will be replaced and carefully measure and order the appropriate casement or awningwindow.Make note of any factory cut-backs and con-sider whether it is advisable to order exact sized oropening sized windows.There are three important considerations regardingAwning and Casement windows that make themCaulkaulkingingdifferent 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 mountingholes in the windows side frames forInstallanstallationtionscrews to anchor the window to the jambs Screw3. There is no sloped sill or drainagecrewaccommodationsThese conditions do not prevent easy installationbut they are conditions which change the basic wayCasement and Awning windows are installed.Blind Stop InstallationConventional installation for replacement windows calls forBlindstop installation where the new window is installed in the opening against theCaulkaulkingingblindstop, the window is screw-anchored to the sides of theopening, and the interior stops are re-applied. Because the Awning and Casement window styles operatewith a swing-out mechanism, a head expander would getin the way of the swing-out sash and spoil the appearanceof the window. This condition requires some fundamentalchanges in the installation procedure. It is necessary to measure accurately and order carefully.Remember, there is no head expander to take up the extra Measurement space in the opening.Normally Double Hung and Slider of the width is replacement windows are factory undercut3/4-inch tohandled the same1-inch lessthan the opening height. This is done to as double-hungaccommodate the height of the stool(1/2) the new win- or sliders.dow must fit over as it is placed in the opening.Installation of Casements and Awnings still must be placed over the stool the casement orand set down on the sill.But, because there is no head awning windowexpander supplied, the window will be routinely undercut can proceedat the factory approximately 1/4 less than the measured exactly as with aopening height.This causes the set-in process to become double-hung. Invery snug and difficult. fact, substitutionof casements orCareful measurement is extremely important so that awning windowsthe Casement or Awning factory manufactured height is at for a removedleast1/4 smallerthan the opening height, but no more double-hung orthan 3/8 smaller!If the height of the Casement/Awning slider can add awindow is smaller than 1/4 less than the opening height, new architecturalit will not fit.If it is more than 3/8 less, the window will design look tonot fit the opening well enough to adequately seal out any house. drafts and moisture.Window Fitters Guide to Window Installation552020 AWDI, LLC Do not reproduce without permission'