Installation Guide

INSPECT ROUGH OPENING
PREPARE BUCK
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Note! This section applies to installations into a masonry wall only. For
installations into a stud-framed wall, begin with section 4, “PREPARE
STUD-FRAMED WALL.”
1. Seal any joint larger than 1/16" in the buck and between the buck and
the concrete/masonry withsealant.
Sealant joints
Liquid
applied
ashing
2. Cover the buck and the surrounding concrete/masonry at the head and
jambs with liquid applied ashing as shown.
3. If installing into a four-sided buck, seal the sill in a similar manner.
Note! Where the window will sit on the sill, shim to provide continuous
support to the sill. This shimming must be a minimum of the width of the
window frame and a minimum of 1/4" narrower than the depth of the
window frame sill, should level the rough opening sill and be no more
than 1/4" thick.
4. Align the shimming on the sill ush with the exterior and centered
between the side jambs. If installing a mulled unit, shim under the mull
joint(s) and tack into place or secure with sealant. SKIP to section 5,
“PREPARE WINDOW.”
• Verify the width and height of the window are each 1/2"-5/8" smaller
than the rough opening width and height. Mulled units should be
3/4"narrower.
• Verify the rough opening is square. The (A) and (B) measurements
should be the same. Maximum allowable deviation from square is 1/8"
for windows 20 sq. ft. and smaller, and 1/4" for windows larger than
20sq.ft.
• Verify the rough opening is plumb and level (C, E and D). The maximum
allowable deviation is 1/16" for every 2' of rough opening (not to
exceed1/8").
• The rough opening sill must not be crowned or sagged (D), but rather
level or sloped (positive slope) to the exterior.
• The exterior face of the rough opening must be in a single plane (E)
with less than 1/8" twist from corner to corner.
• Minimum double studs (king and jack/trimmer) should be used to
support the header at all rough openings.
For Retrot Installations
After removing the old window, remove sufcient cladding (siding, stucco,
etc.) to expose enough intact building wrap to properly seal the window
to the opening. If damaged, apply new building wrap in shiplap manner.
Verify the rough opening framing is structurally sound. Contact your local
waste management entities for proper disposal or recycling of products
beingremoved.
A
D
C
E
B
Verify Square, Level and Plumb
Installation Instructions
for Wood/Clad Wood Windows with Exterior Trim or Nail Fin (JII024)
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