Kommerling windows and exterior finishes
The integral mounting flanges on Kommerling windows are not structural nailing flanges. They must
not be used to anchor the window to the wall structure. Kommerling will provide anchoring straps to
permanently mount the window into the window/wall assembly. Fasteners penetrating the flanges can
cause operating problems and damage that is not covered by warranty. No permanent fasteners are to
penetrate window flanges after the window installation. The builder or person of authority shall notify all
trades of this requirement.
Exterior finish material must not restrict thermal movement of the window unit. Exterior finish material
details must allow for movement between the exterior finish material and the window frames. Exterior
finish material that restricts movement between the exterior finish material and the window frames can
result in damage to the windows.
Kommerling strongly recommends that builder and building designer review exterior finishing details
and coordinate the work of trades to ensure that fasteners used to attach exterior finishes and flashings
do not penetrate Kommerling mounting flanges and to ensure that exterior finish material details allow
for movement between the exterior finish material and the window frames.
1.7 Building codes

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Kommerling builds quality units based on information provided by the purchaser. It is the responsibility
of the owner, architect or builder to select and install units in compliance with all applicable laws,
regulations and building codes.
1.8 Building interface detailing
These instructions show you how to place, shim and anchor the windows to the building. They do not
show you how to prepare the building envelope and rough opening nor how to apply all the sealants,
flashings, or barrier membranes required for a code compliant and weather-sealed installation. These
requirements vary from one jurisdiction to another. It is presumed the installer has a working
knowledge of the tools, equipment, and methods necessary for the installation of fenestration units. It
further assumes familiarity with flashing and sealing, glazing procedures, finishes where applicable,
and an understanding of the fundamentals of installation that affect the installation of these units.
Before installation the authority having jurisdiction (architect, building envelope consultant, local
building department or building inspector) should be consulted about requirements for weather-tight
installation, including use of flashings, sealants and barrier membranes. Kommerling recommends
following ASTM E 2112-01 guidelines for sealing and flashing exterior windows.
1.9 Rough opening
The quality and installation of the material/lumber and fasteners of the rough opening must be
structurally adequate for design load requirements. The structure above all window openings must be
designed to limit deflection due to dead loads and live loads. The maximum allowable deflection of the
structure above or below Kommerling windows is +/- 3/8”.
8
Kommerling Windows and Doors
German Engineered 76MD072919
Check all rough openings to see if they are square and have a level sill and plumb (vertical) jambs.
Make sure that the outside face of the wall is straight and plumb. If a rough opening is out-of-square,
adjust the thickness of the shim blocks as necessary to make sure that you install the window in a
square, level and plumb way. Maintain a uniform space around the frame where possible, even if the
rough opening is not. If the outside face of a wall is bowed or leaning, install the window to be vertical.
If any conditions exist that would prevent the proper installation of the fenestration unit, or prevent
application of materials and components in accordance with local codes, inform the general contractor
or the party responsible for the installation. Make sure that the general contractor corrects the rough
opening if you find the rough opening does not allow you to install the unit perfectly level, square,
plumb, and straight in every direction.
The rough opening size for Kommerling windows should be 3/4” -1” wider and 3/4”-1“ taller than the
outside measurement of the window frame.
1.10 Compatibility of materials
Sealants, adhesives, adhesive tapes and barrier membranes used with Kommerling windows must be
compatible and safe for use with rigid PVC and Kommerling painted and laminated color finishes.
Installer or authority having jurisdiction is responsible to select compatible materials. The Kommerling
warranty does not cover damage to Kommerling units or surrounding materials arising from the use of
incompatible or unsuitable units.
If you are not sure what the finishes are on the Kommerling units you are installing, contact your
Kommerling representative.
1.11 Protecting installed units
Use caution to avoid damage to windows before and after installation. Many field-applied protective
coatings can damage fenestration gaskets and sealants, especially insulating glass sealants, and are
not recommended. Contact Kommerling before applying any such coatings.
Do not block sashes in the open position with lumber or other materials.
Keep sills of operable windows free of dust, dirt and installation debris. Make sure gaskets are not
damaged or dislodged and that drain slots are not blocked.
Protect installed windows from other installation activity such as welding spatter, grinding sparks,
concrete, mortar, stucco, paint, acid solutions used to wash masonry and other harmful installation
materials and practices.
Do not use metal scrapers, paint thinners, chemical solvents or abrasive cleaners to clean any part of
the glass or framing on Kommerling units during or after installation.
1.12 Protective tapes and protective films.
Vinyl window frames may have protective plastic tape applied to interior and exterior surfaces to protect
them during manufacturing and handling. Glass surfaces may have protective film applied to interior
and exterior surfaces. Protective tape on exterior vinyl surfaces must be removed as soon as units are
installed. Protective film on exterior glass surfaces must be removed within twelve months of
installation