Fiberglass Installation Systems

Pella offers a full range of installation systems to accommodate the installation of Pella® Impervia® windows and patio doors in virtually any building.

New Construction Methods of Attachment

There are many options for installing Pella® Impervia® fiberglass composite windows in new construction and renovation projects1

  • Nailing fins
  • Flanges
  • Block frames with fins
  • Masonry clips or jamb screws


View Complete Installation Details

Integral Fin

Integral Fin

The integral fin design features a continuous fin, allowing the window frame to be integrated into the building's weather-resistant barrier using the Pella Window and Door Installation Method.2

This total installation solution includes our exclusive SmartFlash® installation tape and low-expansion, low-pressure polyurethane insulating window and door foam sealant.

  • Downloadable Install Details
      Integral Nailing Fin with Brick Veneer DWG | DXF
      Integral Nailing Fin with Siding DWG | DXF
      Integral Nailing Fin with Southwestern Style Stucco DWG | DXF
      Integral Nailing Fin with Vinyl Siding DWG | DXF

Block Frame


  • The block frame provides a variety of attachment and installation options
  • Windows can be installed in wood/steel frame openings using optional fins, or in masonry openings using installation clips or jamb screws
  • Block frames may also be used in window replacement projects without removing the existing frame or damaging the exterior


Block Frame with Offset Fin


  • The continuous offset nailing fin is designed for use in new construction with thin exterior claddings like stucco, thus allowing the window to be located more to the interior
  • When the offset is not required, a standard profile fin is available (Shown below with dashed lines.)
Block Frame with Offset Fin


Block Frame with Installation Clip

For new construction or window replacement where wall conditions or construction sequence requires installation from inside the building.

Block Frame with Installation Clip

  • Downloadable Install Details
      Door with Concrete Block and Brick Veneer DWG | DXF
      Window with Concrete Block and Brick Veneer DWG | DXF
      Installation Fins, Jamb Extensions, Installation Clip DWG | DXF

Block Frame with Screw Attachment

For new construction or window replacement where normal fin/tape installation cannot be accomplished because of wall conditions or construction sequence.

Block Frame with Screw Attachment


Receptors and Subsill

Receptors are used for multistory buildings requiring installation from the interior or when a more robust installation method is desired.







1. Not all installation methods are available on all products. Check with your local Pella commercial representative for details.
2. This method is applicable for installation of Pella windows and doors only. Pella warranty does not recommend use with other manufacturers' products.



New Construction Punched Openings



A facade created by the orderly placement of single or multiple windows in punched openings in a wall can be a strong design statement. With Pella's wide range of sizes and product types, your punched-opening design options are virtually unlimited.


View Complete Installation Details

View Comprehensive Design Recommendations for Window and Door Combinations

View Step-by-Step Installation Instructions


Design Recommendations


Depending on the number and configuration of windows and doors per opening, design recommendations for perimeter clearances, weight limitations, wind loads and water management may vary.



Perimeter Clearances


  • To determine window opening size for typical installations, add 1/2" to frame width and height
  • For large windows, multiple windows, out-of-plumb openings, and/or in masonry construction, the need for additional jamb clearances should be reviewed





Typical Sealant Recommendations

Proper sealant placement is critical to window or door performance.



When applying siding, brick veneer or other exterior finish material, leave adequate space between the unit frame and the exterior finish material for backer rod and sealant.

Note: The sealant details shown are standard recommendations from the sealant industry. Contact your sealant supplier for recommendations and instruction for this or any other application.



New Construction Horizontal Ribbons



Ribbon windows are an important design element for buildings with sweeping horizontal lines. Pella fiberglass windows offer elegant solutions for virtually any ribbon application - and our technical staff can assist you with expansion/control and reinforced mullion details to reconcile your design objectives with functional requirements.

View Comprehensive Design Recommendations for Window and Door Combinations


Typical Elevation

These recommendations apply to a typical horizontal combination of any vent or fixed unit.

  1. Minimum 1/4" clearance on smaller openings
  2. Check if mullion reinforcement is required due to specified wind loading. Minimum 1/2" clearance is recommended at each jamb for openings with three or more windows
  3. Proper sealant placement is critical to window performance
  4. Subsill systems that weep incidental moisture to the exterior are recommended for water management in openings where the potential for water infiltration is increased and may not be adequately managed by the building weather barrier, flashings and drainage system. Sample conditions include, but are not limited to: increased level of exposure due to multi-story construction, high weather exposure, recaulking would be difficult or unlikely, non-standard installation methods, or when there are multiple units joined within the opening



Subsill


Subsill systems that weep incidental moisture to the exterior are recommended for water management in openings where the potential for water infiltration is increased and may not be adequately managed by the building weather barrier, flashings and drainage system.

Sample conditions include, but are not limited to:

  • Increased level of exposure due to multi-story construction
  • High weather exposure
  • Recaulking would be difficult or unlikely
  • Non-standard installation methods
  • When there are multiple units joined within the opening



New Construction Vertical Stacks



When you want the visual impact of vertically stacked windows, the Pella Commercial technical staff can work with you to provide mullion reinforcement or intermediate dead-load support detailed to ensure compatibility with your aesthetic vision.

View Comprehensive Design Recommendations for Window and Door Combinations


Design Recommendations

In addition to the recommendations for punched openings, the greater height of vertical stacks often requires special detailing, reinforcing mullions, intermediate dead load support, and subsills to resist structural loads, allow for construction tolerances, and provide adequate water management.


Typical Elevation

These recommendations apply to typical vertical stacking of vent or fixed units of the same width to a maximum height of 10' without intermediate support.

  1. Intermediate dead load support is required as needed
  2. 1/2" clearance is recommended at each jamb for construction tolerances in large combinations
  3. Check if reinforcing mullion is required due to specified wind loading and dead load
  4. Subsill systems that weep incidental moisture to the exterior are recommended for water management in openings where the potential for water infiltration is increased and may not be adequately managed by the building weather barrier, flashings and drainage system. Sample conditions include, but are not limited to: increased level of exposure due to multi-story construction, high weather exposure, recaulking would be difficult or unlikely, non-standard installation methods, or when there are multiple units joined within the opening (See subsill detail below.)
  5. Pella® Impervia® windows require stacked units to be mulled together using the combination mullion accessory prior to placing the windows in the rough opening. Practical consideration should be given to limiting the quantity of stacked units within a given height to an amount that can be safely handled by the installer without damage to the units and mullion integrity. The recommended number of units per stack is three or less



Subsill




Design Recommendations


  • Intermediate dead load support is required for vertical stacks more than 10' in height
  • Many solutions are possible, including those shown
  • Recommendations on the Weight Limitations of Transoms over Doors
  • Check local code requirements when stacking windows past floor lines



New Construction Entrances and Storefronts


Configurations that combine aluminum-clad wood entrance doors with fixed fiberglass windows at street level provide virtually infinite design possibilities for creating welcoming building entries.

View Comprehensive Design Recommendations for Window and Door Combinations


Design Recommendations

Storefronts and entrances include a combination of windows and doors that often require reinforcing mullions, expansion mullions, and subsills to resist wind loads while providing adequate water management.



Typical Elevation






New Construction Window Walls



When your project requires the visual impact and energy efficiency of Fiberglass window walls, the Pella Commercial design team can partner with you early in the project to develop engineered fenestration solutions that meet your performance and load requirements without compromising your design vision. Plus, the beautiful wood interiors provide a unique design aesthetic.

View Comprehensive Design Recommendations for Window and Door Combinations


Design Recommendations

Window walls may include a combination of windows and doors that require reinforcing mullions, expansion mullions, and subsills to resist wind loads while providing adequate water management.



Typical Elevation






New Construction Combinations (Mulling)

Combinations

This section explores the opportunities, requirements and limitations related to joining various combinations of standard Pella® fiberglass windows and doors.


Specific accessories and construction details must address the various conditions that are critical for the proper design of combinations of windows and doors such as:

  • Proper flashing
  • Control joints to accommodate expansion and contraction
  • Intermediate structural
  • Mullion reinforcing and it's end anchorage to the rough opening
  • Rough opening wall construction to accept loads transferred from window combination

Combination Recommendations


Mullion Design

Placing windows and doors in a combination creates joints or mullions that may need structural reinforcing.

  • Spread mullions can also be utilized to achieve an aesthetic element
  • In order to ensure that a given combination will withstand the design pressure, use the reinforcing tables on the following pages
  • These tables are organized by joint type and assembly type (factory vs. non-factory assembled)
  • Use the graphical representation of each joint type to determine which joint type(s) are contained within the combination
  • The reinforcing tables consider structural performance only
  • See the Size and Performance Data page within each product section for single unit performance class and grade ratings

Download Install Details


  • Mullion Covers, Door Reinforcing Mullion DWG| DXF
  • Window Reinforcing Mullion, Subsill DWG| DXF

Important:
Determining and meeting the structural load requirements and design of the rough opening is the responsibility of the architect or engineer. Window and door frame systems are not designed to support additional elements or components of the building wall system.



New Construction Exterior Trim Options

Frame Expander

Durable, snap-in trim that is adjustable to field conditions

  • Prefinished; matches Pella products
  • Provides the look of flat trim
  • Aluminum brickmould can be attached to re-create the look of historical wood brickmould
  • No metal brake required
  • Cut-to-length kits, 96" or 144" lengths
  • Available in widths from 1" to 6"
  • Receptors are available to provide a finished edge



Frame Expanders


Alumminum Brickmould with Clip


Head Detail


AZEK® TRIM SURROUNDS

Decay-resistant PVC trim, field-cut or factory-assembled materials

  • Ready for site finishing
  • Cellular PVC material that's impervious to insects and moisture
  • Preassembled surrounds or 9' lengths
  • 4" or 5" flat trim, or 2" brickmould with sill nose



Trim Profiles


Sill Profiles


Installation Detail


ROUGH/SMOOTH WOOD

Field-cut, protected, reversible wood trim

  • Primed and ready for site finishing
  • Grained or smooth appearance
  • 10' lengths
  • 3-1/2" or 5" flat widths, 3/4" thickness



Trim Profiles


Head Detail


Interior Trim Options

The industry's most popular wood interior trim styles provide a vast range of options that are true to a home's architectural style and decor.

  • All profiles are available in Pine; select profiles are available in Oak
  • Pine trim styles are available prefinished in 8 stain colors or 4 paint colors, or unfinished
  • Oak trim styles are available prefinished with 8 stain colors or unfinished

Wood interior trim from Pella is available two ways:

Trim ordered by the lineal foot

  • Ready for cutting and installation at the job site
  • Curved trim is ready to be trimmed to fit on the jobsite, and works with many curved openings (windows, doors and transoms)
  • Can be ordered separately

Pella's exclusive Ready Trim, Ready Trim Plus and Ready Trim Knockdown trim kits.

  • Convenient and flexible options to fit your job's requirements
  • Work with Pella wood, fiberglass and vinyl windows
  • Work for many rectangular openings
  • Ready Trim Knockdown can be ordered on select wood entry doors and patio doors
  • Must be ordered with the unit


Ready Trim

Field Applied, Designed for all Pella windows and doors


Ready Trim

  • For use with or without Jamb Extensions
  • 4 pieces of trim, Pre-Assembled
  • Packaged by unit

Ready Trim Plus

  • Save time when Jamb Extensions are needed
  • 4 pieces of trim, 4 Jamb Extensions, 4 Cover Strips, Pre-Assembled
  • Packaged by unit
  • Optional Stool and Apron available

Ready Trim Knockdown

  • Pre-measured and kitted to save time
  • 4 pieces of trim with 10" excess
  • Unassembled and unmitered
  • Kitted by order

Ready Trim Plus Knockdown

  • Pre-measured and kitted to save time
  • 4 pieces of trim with 10" excess
  • Unassembled and unmitered
  • Optional Stool (with 14" excess) and Apron available
  • Kitted by order

Trim Styles Available

All profiles and accessories are available in Pine; select profiles and accessories are available in Oak.

Colonial
Simplicity and symmetry authentic to the traditional style

Craftsman
Lasting influence and attention to detail mold the decorative features

Provincial
Curved arches and soft lines create stylish effects from the simple to the extravagant.

Ranch
Smooth transitions and a long, low profile highlight the style options.

Accessories

Coordinate accessory trim to accents in the home with these beautiful choices

Stops

Lattices

Stools

Quarter Rounds

Trim

Renovation Complete Tear-Out of Existing Frame and Sash

Complete Tear-out of Existing Frame and Sash


Depending on the needs of the project, fiberglass windows can be used to replace existing wood or metal windows when a complete tear-out of the existing frame and sash is required.



Block Frame with Screw Attachment

Block Frame with Screw Attachment

Block Frame with Installation Clip

Block Frame with Installation Clip

  • Downloadable Install Details
      Door with Concrete Block and Brick Veneer DWG | DXF
      Window with Concrete Block and Brick Veneer DWG | DXF
      Installation Fins, Jamb Extensions, Installation Clip DWG | DXF


Flush Flange


  • The flush flange frame is designed specifically for replacement applications on stucco exteriors in arid climates like those found in the southwestern part of the United States.
  • The flush flange allows for quick installation without removing the existing frame or damaging the stucco exterior.


Renovation Retain Existing Frame and Replace Sash

In contrast to the complete tear-out approach, the more commonly used approach to window replacement recognizes that the frame and trim that is already installed in the exterior wall may still be fully serviceable, but the operable or fixed sash may need replacing.

  • It saves on the labor costs associated with the complete tear out approach, but also assumes that other considerations can be met through the re-use of the existing frame and trim.
  • Reuse may enhance historic or maintenance considerations depending on the project.
  • Pella offers a variety of installation systems designed to accommodate this approach.


Pocket Installation

For window replacement when the existing frames are in good condition and only the sash needs to be replaced.




Standard Subframe System

For window replacement when wood windows are being replaced with fiberglass windows.



Block Frame with T-Subframe

For window replacement requiring installation from inside the building, Pella's T-subframe system reduces labor costs by eliminating the need for exterior scaffolding.

Block Frame with T-Subframe


Flush Flange

Flush Flange

Technical Documents Technical Downloads

Technical Downloads



Combinations


Installation Details

  • Overview PDF

  • Accessories
      Installation Fins, Jamb Extensions, Installation Clip DWG | DXF
      Mullion Covers, Door Reinforcing Mullion DWG | DXF
      Window Reinforcing Mullion, Subsill DWG | DXF
  • Fin Installation
      Integral Nailing Fin with Brick Veneer DWG | DXF
      Integral Nailing Fin with Siding DWG | DXF
      Integral Nailing Fin with Southwestern Style Stucco DWG | DXF
      Integral Nailing Fin with Vinyl Siding DWG | DXF
      Sliding Door with Brick Veneer DWG | DXF
      Sliding Door with Siding DWG | DXF
      Sliding Door with Southwestern Style Stucco DWG | DXF
      Sliding Door with Vinyl Siding DWG | DXF
  • Clip Installation
      Door with Concrete Block and Brick Veneer DWG | DXF
      Window with Concrete Block and Brick Veneer DWG | DXF

Replacement and Renovation Systems


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