Installation Guide

INSPECT ROUGH OPENING
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• 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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