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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 insulating foam sealant

. 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. 

This will allow room for expansion of the foam and will minimize 

squeeze out. Apply sealant across interior surface of shims to create a 

continuous seal. Follow foam manufacturer's instructions. 

Note: DO NOT completely fill the space from the back of the fin to 

the interior face of the opening. 

B. 

Check window operation

 (vent units only) 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.

Interior

4A

When applying siding, brick veneer or other exterior finish material, leave adequate space 

between the window frame and the material for sealant. Refer to the illustration that 

corresponds to your finish material.

Note: The sealant details shown are standard recommendations from the sealant industry. 

Contact your sealant supplier for recommendations and instructions for these and any other 

applications.

VINYL/STEEL

SIDING

3/8" Clearance

Backer Rod and

Sealant typical

Insulating

Foam

Perimeter Sealant 

must extend to room

side of Accessory 

Groove.

Accessory Groove

3/8"

Min.

3/8"

WOOD SIDING

WITH TRIM

3/8" Clearance

Insulating

Foam

Perimeter Sealant 

must extend to room

side of Accessory 

Groove.

Accessory Groove

Sealant typical

3/8"

Min.

3/8"

BRICK VENEER

3/8" Clearance

Backer Rod and

Sealant typical

Perimeter Sealant 

must extend to room

side of Accessory 

Groove.

Accessory Groove

Insulating

Foam

3/8"

Min.

3/8"

WOOD

SIDING

Insulating

Foam

1/8"

1/8" Clearance

Sealant typical

Accessory

Groove

4

INTERIOR SEAL

5

SEALING THE WINDOW TO THE EXTERIOR  

WALL CLADDING

Summary of Contents for 812W0100

Page 1: ... 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 Framing Corner Flashing Tape Top Flashing Tape Corner Flashing Tape Fin Corner Window Top Nailing Fin Window Bottom Side Flashi...

Page 2: ...ing to make sure it is 3 4 larger than the window in both width and height On larger openings measure the width and height in several places to ensure the header or studs are not bowed Note 1 1 2 or more of solid wood blocking is required around the perimeter of the opening Fix any problems with the rough opening before proceeding Interior 1A Interior 1B C Cut the water resistive barrier 1C 1D Ext...

Page 3: ...quired at points where windows are joined in multiple window applications Add shims as necessary to ensure the spacers are level Once level attach spacers and shims to prevent movement Note Improper placement of shims or spacers may result in bowing the bottom of the window 2A 2C B Remove plastic wrap and cardboard packaging from window DO NOT remove plastic shipping spacers located between the wi...

Page 4: ...clip placement Clips provided should be evenly spaced across the curved frame member and no more than 16 on center Place the clips so the lip is facing up and against the instillation fin Secure each clip by driving a 6 x 5 8 corrosion resistant screws through the outer two holes of the three holes shown 2E E Insert the window from the exterior of the building Place the bottom of the window on the...

Page 5: ...hed hole in the nailing fin Note Make sure the fin corner is lying as flat as possible 2 SETTING AND FASTENING THE WINDOW continued J For units with flexible non structural curved fin on which clips were added Fasten the clips to the opening by driving two 6 x 1 1 2 or longer corrosion resistant into the pre punched holes in the clips If clips are bent and fastened to the interior stud install the...

Page 6: ...re folding the tape at 1 2 before removing the paper backing will make it easier to apply the tape correctly If the siding is less than 1 2 thick adjust the dimension of the fold so the exterior sealant line will cover the exterior edge of the tape 3 INTEGRATING THE WINDOW TO THE WATER RESISTIVE BARRIER Flashing Tape Rectangular Units Only A Apply side flashing tape Cut two pieces of flashing tape...

Page 7: ... of flashing tape will be needed to cover the top fin Start taping from the sides of the window working toward the peak To determine the length of cuts hold the tape along the radius and cut the tape just past where it leaves the top fixed extruded fin or for the flexible fin just past the flexible weather strip The top tape must overlap the one beneath it in order to divert water properly The sha...

Page 8: ...ustments are required remove the foam with a serrated knife Adjust the shims and reapply the insulating foam sealant Interior 4A When applying siding brick veneer or other exterior finish material leave adequate space between the window frame and the material for sealant Refer to the illustration that corresponds to your finish material Note The sealant details shown are standard recommendations f...

Page 9: ...ty exterior grade sealant to the entire perimeter of the window C Shape tool and clean excess sealant When finished the sealant should be the shape of an hourglass Note This method creates a more flexible sealant line capable of expanding and contracting 5A 5B 5 SEALING THE WINDOW TO THE EXTERIOR WALL CLADDING continued Additional cutting patterns Circle Head Full Circle Trapezoid Octagon Arch Hea...

Page 10: ... 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 This informatio...

Page 11: ...final installation fold the crank over and snap the knob into the pocket Note Even with the window open the crank can be folded to avoid interfering with the window treatments Crank Handle C D Operator Stud Set Screw A B Pocket End Operator Stud Knob E Pocket LOCK LEVER REMOVAL AND INSERTION Note You may want to remove the lock lever prior to finishing the window or if it needs to be replaced with...

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