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Step 1: Rough Opening and Framing Requirements (cont.)
Figure 2: Preparing openings for concrete block openings.
1
Rough opening gap must be no more than 1/4″ for products certified for use in IZ4 regions.
CAUTION! If the previous conditions are
not met, the installer must take corrective
actions to alter the opening(s) before
proceeding. It is also essential that the sheathing
behind the wall be a solid surface to ensure that
the unit can be secured firmly to the wall.
NOTE: On standard wood frame construction with
brick veneer, make sure there is at least 1/2
″
(13)
between bottom of window sill (or eventual
placement of the window) and the top row of brick
to avoid “brick bind”.
ATTENTION: B
e aware that use of rigid sill pans and
other barriers will decrease the rough opening height
clearance. Adjust opening dimensions accordingly.
Rough Opening
Masonry Opening
1/2″
1/2″ 1/4″
1/4″
5. Rough openings
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(RO) should be 1″ (25) wider than
the outside measurement of the frame and 1/2″
(13)
higher. Masonry openings (MO) should be 1/2″ (13)
wider than the outside measurement of the frame or
casing and 1/4
″ (6) higher than the outside measure-
ment of the frame or casing. When framing rough
opening, care should be taken to ensure the sill plate
is level andthe opening issquare, straight andplumb.
Seefigure2.
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