Installation Guide

PREPARE STUD-FRAMED WALL
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Prepare/Shim the Sill
1. Install a sill pan in a weatherproof manner on the rough sill (refer to
ASTM 2112 for types of sill pans).Always allow water to drain out of
the pan and onto the building wrap, drainage plane or to the exterior.
2. Use self-adhered ashing to waterproof the sill.
3. Flashing must have at least 2" of visible material below nail n.
Flashing width must be at least measurement A + B + 1-3/4" (Fig. A).
4. Measure the width of the frame from the interior to the nail n/trim
(measurement A) and subtract 1/4". Transfer this measurement from
the outside edge of the rough opening sill and draw a line all along
the rough opening sill. This is where the back of the ashing willsit
(Fig. B).
Measure
frame
width
A
B
Interior
5. Cut a piece of ashing the length of the sill plus 12" (Fig. B).
6. Place ashing on rough opening sill, wrapping the ashing up 6" on
each jamb as shown.
7. Pull release tape and set ashing into place.
Width of
rough opening
12"
Continuous
support
Depth of
window
minus 1/4"
6"
6"
Flashing
Nail n position
2" min.
FIg. A FIg. B
11. 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.
8. Fold the ashing down onto the wall. Mechanically fasten if
necessary.
9. Smooth out any bubbles or creases with a J-roller. Remove and
replace ifnecessary.
10. Install the continuous support as follows:
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.
Installation Instructions
for Wood/Clad Wood Windows with Exterior Trim or Nail Fin (JII024)
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