© 2010 Pella Corporation
Part Number: 816G0101
INSTALLATION INSTRUCTION - INSTRUCCIONES DE INSTALACIÓN
FOR PELLA® PRECISION FIT®, CASEMENT, RENOVATION POCKET
REPLACEMENT AND FIXED WINDOW REPLACEMENT
Lea las instrucciones en español en el reverso.
Important! e Pella Precision Fit Casement Replacement Window is designed to replace older style
double-hung windows. e original window frame will remain in place and only the existing sash
will be removed. e Pella Precision Fit Casement Fixed Window is a companion to the Precision Fit
Casement and is designed to replace the fixed center window that shares a common stool and sloped
sill with the adjacent windows and has removable interior stops. is application is typically found
in older homes. e original window frame will remain in place and only the existing sash, glass and
existing stops must be removed. ese instructions are not to be used with any other construction
methods. Read these instructions thoroughly before beginning. Failure to install as recommended will
void any warranty, express or implied. For types of installation other than shown, contact your local
Pella representative or visit http://www.pella.com. Building designs, construction methods, building
materials and site conditions unique to your project may require an installation method different
from these instructions and additional care. Determining the appropriate installation method is the
responsibility of you, your architect or construction professional.
YOU WILL NEED TO SUPPLY:
TOOLS REQUIRED:
• Cedar or Impervious shims/spacers (12 to 20)
• Wood blocking and bracing
• Tape measure
• Level
• Square
• Closed cell foam backer rod/sealant backer (12 to 30 ft.)
• Hammer
• Pella® SmartFlash™ foil backed butyl window
and door flashing tape or equivalent
• Utility knife
• Sealant gun
• Screwdrivers
(#2 Phillips and Flat blade)
• High quality exterior grade polyurethane or silicone sealant
(1 tube per window)
SEALANT
• Great Stuff ™ Window and Door Insulating Foam Sealant
by the Dow Chemical Company or equivalent low pressure
polyurethane window and door foam -
• Rotary cutting tool w/cut-off wheel (if
existing window has press fit pulleys)
DO NOT use high pressure or latex foams
• Drill
• Pliers
• Putty Knife
• Pry bar
• T-25 TORX® Driver
• Chisel
Installation will require two or more
persons for safety reasons.
REMEMBER TO USE APPROPRIATE PERSONAL PROTECTIVE EQUIPMENT.
Always read the Pella Limited Warranty before purchasing or installing Pella products.
By installing this product, you are acknowledging that this Limited Warranty is part of the terms of
the sale. Failure to comply with all Pella installation and maintenance instructions may void your Pella
product warranty. See Limited Warranty for complete details at http://warranty.pella.com.
CAUTION: Many windows in older homes are painted with lead-based paint. Removal of old
windows may disturb this paint. Proper precautions must be taken to minimize exposure to dust
and debris. Consult state or local authorities for more information.
1
SASH REMOVAL (CONTINUED)
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B. Cut the balance cords on the bottom sash and lift out the sash. Allow weights to fall
to the bottom of the weight pocket.
C. Remove the parting stops by prying them out or by pulling them out with a channel
lock. ere may be a small wedge of wood at the bottom of the upper sash that is next
to the parting stops. To make it easier to remove the parting stop, use a chisel to knock
off the wedge.
D. Lower the top sash and cut the balance cords
allowing the balance weights to fall into the weight
pocket. Remove the top sash.
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E. Remove the balance cord pulleys. Unscrew and
remove the balance cord pulleys. If the pulleys are
press-in fit type, follow these steps:
1. Cut off accessible portions of the collars using a rotary
cutting tool with cut-off wheel.
2. Bend up the remaining areas of the collars.
3. Knock the pulleys into the balance cavity. (e pin will fall with the pulleys.)
4. If desired, remove pulleys via bottom balance access panel.
NOTE: If the pulleys and pins are not removed, they may interfere with the
replacement window’s attachment screws.
F. If desired, insulate the weight chamber by filling it
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2
PREPARE THE OPENING
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A. Apply one piece of sill flashing tape to the sill of the
existing window. Cut the tape the same length as the
width of the existing window sill. Place one side of the
tape against the vertical leg of the stool, and work the
tape into the corner before applying to the sill. Press
down firmly. DO NOT allow the flashing tape to
extend past the blind stops.
2B
B. Check to ensure the existing sill is level and not
bowed (humped) upward. If necessary, place shims
on the bottom of the window opening 1/2" from each
side. Shim sill only at the jambs. Once level, attach
shims to prevent movement.
Note: Improper placement of shims may result in
bowed (humped) sill.
2
PREPARE THE OPENING (CONTINUED)
C. Remove plastic wrap and card board packaging from window. DO NOT remove
plastic shipping spacers located between the window sash and frame. e shipping
spacers will help keep the window square during installation. DO NOT unlock or
open window until it is fully fastened in the opening.
Note: If screens, grilles or hardware are removed from the window at this time,
label them and store them in a protected area.
D. Test fit the window. e window should be
2D
approximately 1/2” smaller than the opening
in both width and height. Measure the distance
between the frame and the sloped sill, this will
Sill Adapter
be the height to which to cut the sill adapter.
Check to ensure the window rests against the
exterior blind stops and will make contact with
the sealant to be applied in steps 3 A, B, and C.
Confirm the installation screws will fasten into
solid wood. If not, repair the existing frame to
ensure there is solid wood at the installation
screw locations.
Sealant goes here
E. Trim the sill adapter to the proper
height by breaking off the grooved leg at
the desired dimension (see chart). Once
trimmed, apply a bead of sealant to the sill
adapter. Attach the sill adapter into the sill
5/16” - 3/8”
7/16” - 1/2”
by using a board and hammer.
9/16” - 5/8”
Note: Scoring the leg groove multiple times
11/16” - 3/4”
at the desired dimension with a utility
knife will help the leg break easier. e sill
adapter may also be trimmed to correct
dimension using a table saw.
13/16” - 7/8”
15/16” - 1”
Score leg at desired dimension.
Use pliers to break off leg.
2E
Sealant
Sill Adapter
3
SEALING AND FASTENING THE WINDOW
Head blind
stop
A. Apply a 3/8" continuous bead of sealant to the
interior face of the existing blind stops at the head
and both jambs.
Jamb
blind
stop
Note: Sealant bead placement is critical to ensure
contact with replacement window
3A
SEALING AND FASTENING
THE WINDOW (CONTINUED)
3
B. Place a bead of sealant where the existing stool
Stool
meets the existing frame sill and jambs.
Note: Sealant bead placement is critical to ensure
contact with replacement window
Sill
3B
C. Place a bead of sealant where the jamb and sill meet.
D. Insert the window into the opening. Set the bottom
of the window in first and tilt the top into place. Make
sure the window is centered in the opening and is
pressed firmly against the exterior blind stops.
3C
E. Place a shim at each of the top corners slightly
above the partially driven (factory supplied)
attachment screws in the jambs. NOTE: If the shims
are aligned with the attachment screws, the frame
may bow away from the shims when driving the
screws. Drive each top attachment screws halfway
in to hold the window in place while shimming it
plumb and square.
3E
F. Place shims approximately 5” up from the bottom of
window to plumb and square the window. Check for
squareness by making sure the diagonal measurement
from corner to corner is within 1/16” in both
directions.
3F
For windows over 40-1/4” tall: Place an additional
shim slightly above the center anchor screws. is will
prevent the screw from cracking or breaking the shim
when driving the attachment screw.
SEALING AND FASTENING
THE WINDOW (CONTINUED)
3
G. Finish driving all the installation screws through the wood frame jamb, ensuring
the head of the screws is flush with the surface of the wood frame.
DO NOT drive screws below flush with the surface of the frame.
3G
3G
Improper screw depth, screw
head driven below the surface
of frame.
Proper screw depth, screw
head flush with surface of
frame.
H. Check window operation (vent units only). Unlock the window by lifting the lock
handle up. Open the window by rotating the crank handle. Remove the shipping
spacers. Open and close the window a few times to check for proper operation. Close
and lock the window.
Note: If there are any problems with the operation of the window, recheck the shim
locations and adjust for plumb and square.
4
INTERIOR SEAL
Caution: Ensure use of low pressure polyurethane window and door insulating foams
and strictly follow the foam manufacturer’s recommendations for application. Use of
high pressure foams or improper application of the foam may cause the window frame
to bow and hinder operation.
A. Apply insulation foam. From the interior, insert
the nozzle of the applicator approximately 1"
4A
deep into the space between the window and the
rough opening and apply a 1" deep bead of foam.
is will allow room for expansion of the foam
and will minimize squeeze out. Allow the foam
to cure completely (usually 8 to 24 hours) before
proceeding to the next step.
Note: It may be necessary to squeeze the end of the
tube with pliers to be able to insert into the space
between the new and existing window frame. DO
NOT completely fill the space from the back of the
blind stops to the interior face of the opening.
B. Check window operation by opening and closing the window.
Note: If the window does not operate correctly, check to make sure it is still plumb,
level, square and that the sides are not bowed. If adjustments are required, remove
the foam with a serrated knife. Adjust the shims, and reapply the insulating foam
sealant.
C. Inspect the foam after it has cured. Fill any voids with foam prior to installing
interior trim.
D. Reinstall the existing interior sash stops or new trim as desired.
5
EXTERIOR SEAL
A. Place a corner bead of sealant at the jambs and head
connecting the existing frame and the replacement
window frame.
5A
Caution: DO NOT seal the bottom exterior to allow for
incidental water to weep.
5A
B. Optional: Place a bead of sealant where the sill
adapter meets the sill. If sealant is placed on the sill
leave at least 1” of sill adapter unsealed at each end.
is sill allow for incidental water to weep.
1”
5B
Sill
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FIXED WINDOW REPLACEMENT:
6
FIXED SASH REMOVAL
Note: Confirm the opening and window dimensions prior to removing the
existing window sash.
A. Score paint or varnish along
interior sash stops with sharp
INTERIOR SASH STOP
utility knife. Carefully remove the
interior sash stops at jambs (sides)
and head (top) using a putty knife
and pry bar. Set aside for reuse.
6A
Interior
sash stop
B. Remove the old sash. Remove
other trim, stops, flashing or
6A
brickmould as required.
6A
C. Clean opening thoroughly and repair or replace any rotted or
damaged framing if required.
Note: e end result should be a clean flat uninterrupted surface
on the bottom, top and sides of the opening where the new window
will be installed.
D. Test fit the window, make any adjustments to opening as needed.
6
7
FIXED SASH REMOVAL (CONTINUED)
E. Apply sill flashing tape. Cut a piece of flashing tape 12"
longer than the opening width. Apply at the bottom of
the opening as shown (2A). Do not allow the flashing
tape to extend past the new window depth.
Flashing
Tape
6E
Note: e tape is cut 12" longer than the width so that
it will extend 6" up each side of the opening.
F. Check to ensure the existing sill is level. If necessary,
place shims on the bottom of the window opening 1/2"
from each side. Shim sill only at the jambs. Once level,
attach shims to prevent movement.
6F
Note: Improper placement of shims may result in
bowing the bottom of the window.
PREPARE THE OPENING
A. Remove plastic wrap and
cardboard packaging from
EXTERIOR
window. Remove the wood
spacers on the frame.
B. Attach bracing to the top
and bottom of the exterior
frame to prevent the
Bracing
replacement window from
falling out of the opening
during installation.
7B
C. Test fit the window. e window should be
approximately 1/2” smaller than the opening
in both width and height. Measure the
distance between the frame and the sloped
sill, this will be the height to which to cut
the sill adapter. Check to ensure the window
rests against the bracing applied in step 7B.
Confirm the installation screws will fasten
into solid wood. If not, repair the existing
frame to ensure there is solid wood at the
installation screw locations.
7C
Proper Sill
Adapter Height
7
PREPARE THE OPENING (CONTINUED)
D. Trim the sill adapter to the proper
height by breaking off the grooved leg
at the desired dimension (see chart).
Once trimmed, apply a bead of sealant
to the sill adapter. Attach the sill
adapter into the sill by using a board
and hammer.
Sealant goes here
5/16” - 3/8”
Note: Scoring the leg groove multiple
times at the desired dimension with
a utility knife will help the leg break
easier. e sill adapter may also be
trimmed to correct dimension using
a table saw.
7/16” - 1/2”
9/16” - 5/8”
11/16” - 3/4”
13/16” - 7/8”
15/16” - 1”
Score leg at desired dimension.
Use pliers to break off leg.
7D
Sealant
Sill Adapter
SEALING AND FASTENING
THE WINDOW
A. Apply a 3/8" continuous bead of sealant to the interior
face of the existing blind stops at the head and both
jambs.
Head blind
stop
8
Jamb
blind
stop
Note: Sealant bead placement is critical to ensure
contact with replacement window
8A
B. Place a bead of sealant where the existing stool meets
the existing frame sill and jambs
C. Insert window into the opening, placing the bottom of
the window on the spacers at the bottom of the opening
and tilting the top into place. Make sure the window
is up against the existing stool. Center the window
between the sides of the opening to allow clearance for
shimming and partially drive one of the top attachment
screws (factory provided in the unit) halfway in to hold
the window in place while shimming it plumb and
square.
Stool
Sill
8B
D. Place shims 1” from the bottom and top of the
window between the window and the sides of the
opening. Adjust the shims as needed to plumb and
square the window in the opening. Also shim slightly
above the partially driven (factory supplied) attachment
screws in the jambs. If the shims are aligned with the
attachment screws, the frame may bow away from the
shims when driving the screws.
8D
Note: DO NOT shim above the window or in the space
between the spacers at the bottom of the window. DO
NOT over shim.
SEALING AND FASTENING
THE WINDOW (CONTINUED)
8
9
E. Finish driving all the installation screws through the wood frame jamb, ensuring
the head of the screws is flush with the surface of the wood frame.
DO NOT drive screws below flush with the surface of the frame.
8E
8E
Improper screw depth, screw
head driven below the surface
of frame.
Proper screw depth, screw
head flush with surface of
frame.
INTERIOR SEAL
Caution: Ensure use of low pressure polyurethane window and door insulating foams
and strictly follow the foam manufacturer’s recommendations for application. Use of
high pressure foams or improper application of the foam may cause the window frame
to bow and hinder operation.
A. Apply insulation foam. From the interior, insert the
nozzle of the applicator approximately 1" deep into
the space between the window and the rough opening
and apply a 1" deep bead of foam. is will allow
room for expansion of the foam and will minimize
squeeze out. If using insulating foam other than Great
Stuff™ Window and Door Insulation Foam by the
Dow Chemical Company, allow the foam to cure
completely (usually 8 to 24 hours) before proceeding
to the next step.
9A
Note: It may be necessary to squeeze the end of the
tube with pliers to be able to insert into the space
between the new and existing window frame. DO NOT completely fill the space
from the back of the backer rod to the interior face of the opening.
10
EXTERIOR SEAL
10A
A. Insert backer rod into the space
around the exterior of the window
at the head and jambs, deep enough
to provide at least a 1/2” clearance
between the backer rod and the
exterior face of the window.
10A
Note: Backer rod adds shape and
depth for the sealant line.
10
EXTERIOR SEAL (CONTINUED)
B. Apply a bead of high quality exterior grade sealant to
10B
the head and jambs.
10B
C. Optional: Place a bead of sealant where the sill adapter
meets the sill. If sealant is placed on the sill leave at least
1” of sill adapter unsealed at each end. is sill allow for
incidental water to weep.
1”
10C
Sill
INTERIOR FINISH
Note: e information below is effective September 15, 2007. is information may be
different than the printed instruction.
If products cannot be finished immediately, cover with clear plastic to protect from dirt,
damage and moisture. Remove any construction residue before finishing. Sand all wood
surfaces lightly with 180 grit or finer sandpaper. DO NOT use steel wool. BE CAREFUL
NOT TO SCRATCH THE GLASS. Remove sanding dust.
Pella products must be finished per the below instructions; failure to follow these
instructions voids the Limited Warranty.
• On casement and awnings, it is optional to paint, stain or finish the vertical and horizontal sash
edges.
• On single-hungs and double-hungs, do not paint, stain or finish the vertical sash edges, any
finish on the vertical sash edges may cause the sash to stick; it is optional to paint, stain or finish
the horizontal sash edges.
• On patio doors, it is optional to paint, stain or finish the vertical and horizontal panel edges.
Note: To maintain proper product performance do not paint, finish or remove the weather-
stripping, mohair dust pads, gaskets or vinyl parts. Air and water leakage will result if these
parts are removed. After finishing, allow venting windows and doors to dry completely
before closing them
Pella Corporation is not responsible for interior paint and stain finish imperfections for
any product that is not factory-applied by Pella Corporation. Use of inappropriate finishes,
solvents, brickwash, or cleaning chemicals will cause adverse reactions with window and
door materials and voids the Limited Warranty.
For additional information on finishing see the Pella Owner’s Manual or go to
EXTERIOR FINISH
e exterior frame and sash are protected by aluminum cladding with our tough
EnduraClad® or EnduraClad Plus baked-on factory finish that needs no painting. Clean
this surface with mild soap and water. Stubborn stains and deposits may be removed with
mineral spirits. DO NOT use abrasives. DO NOT scrape or use tools that might damage
the surface.
Use of inappropriate finishes, solvents, brickwash or cleaning chemicals will cause adverse
reactions with window and door materials and voids the Limited Warranty.
CARE AND MAINTENANCE
Care and maintenance information is available in the Pella Owner’s Manual. You can
obtain an owner’s manual by contacting your local Pella retailer. is information is also
available on www.pella.com.
IMPORTANT NOTICE
Because all construction must anticipate some water infiltration, it is important that the
wall system be designed and constructed to properly manage moisture. Pella Corporation
is not responsible for claims or damages caused by anticipated and unanticipated water
infiltration; deficiencies in building design, construction and maintenance; failure to
install Pella products in accordance with Pella’s installation instructions; or the use of
Pella products in wall systems which do not allow for proper management of moisture
within the wall systems. e determination of the suitability of all building components,
including the use of Pella products, as well as the design and installation of allow for proper
management of moisture within the wall systems. e determination of the suitability
of all building components, including the use of Pella products, as well as the design and
installation of flashing and sealing systems are the responsibility of the Buyer or User,
the architect, contractor, installer, or other construction professional and are not the
responsibility of Pella.
Pella products should not be used in barrier wall systems which do not allow for proper
management of moisture within the wall systems, such as barrier Exterior Insulation and
Finish Systems, (EIFS) (also known as synthetic stucco) or other non-water managed
systems. Except in the states of California, New Mexico, Arizona, Nevada, Utah, and
Colorado, Pella makes no warranty of any kind on and assumes no responsibility
for Pella windows and doors installed in barrier wall systems. In the states listed
above, the installation of Pella Products in barrier wall or similar systems must be in
accordance with Pella’s installation instructions.
Product modifications that are not approved by Pella Corporation will void the Limited
Warranty.
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