Replacement Window Installation

Window and door installations vary greatly depending upon the age and style of the home as well as the products being installed. There are many ways of taking out an old window or door and installing a new one, but there are only a few ways that will hold up over time. It is critically important that the exterior integrity of the home is maintained throughout the installation process. The best products will perform poorly and fail over time without proper installation.

Generally speaking, if the old window has a nail fin then the new window should have one too. Installing the new window with the fin is just the beginning. The new window must be properly integrated into the wall structure utilizing multiple sealing layers. A weatherboard system of layering is used during the installation process, which ensures that the harsh winter rains will not be able to penetrate into the walls.

A few of the steps are illustrated below. (click an image to enlarge)

Window Installation, cutting siding away Window Installation, expose the nail fin

Siding is cut out around the old window exposing the nail fin.


Window Installation, removing old window Window Installation, window opening is cleaned out

Old window is removed completely and the opening is cleaned.


Window Installation, interior surrounds are cut back Window Installation, sealant is applied behind the nail fin

Interior surrounds are cut back to allow new window to fit properly
and sealant is applied behind the nail fin.


Window Installation, new window installed, leveled, plumb and squared Window Installation, flashing is installed over the nail fin

New window is installed level, plumb and square.
Flexible flashing is installed over the nail fin in a weatherboard fashion.


Window Installation, exterior trim installed, finish caulking, cleaning of window

Exterior trim is installed prior to final finish caulking
and cleaning of the new window.


Many older homes with wood windows will be installed using the slope sill box frame method of installation. This method entails removing the movable sash of the old windows and installing the new window within the existing frame of the old window.


Wood Framed Window Installation, removal of interior stop and bottom sash

Removing the interior stop
to enable removal of bottom sash.


Wood Framed Window Installation, removing bottom sash after disconnecting weights

Removing bottom sash
after disconnecting weights.

Wood Framed Window Installation, removal of parting bead to remove top sash

Taking out parting bead which
allows top sash to be removed.


Wood Framed Window Installation, window frame opening cleaned and fresh caulk applied

Back bed of caulking after sash
is removed and opening cleaned.

Wood Framed Window Installation, installing of new windows

Installation of new window
working around obstacles.


Wood Framed Window Installation, final finish caulking to window frame interior and exterior

Final finish caulking on interior and exterior.

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Window Installation

Window and door installations vary greatly depending upon the age and style of the home as well as the products being installed. There are many ways of taking out an old window or door and installing a new one, but there are only a few ways that will hold up over time. It is critically important that the exterior integrity of the home is maintained throughout the installation process. The best products will perform poorly and fail over time without proper installation.

Generally speaking, if the old window has a nail fin then the new window should have one too. Installing the new window with the fin is just the beginning. The new window must be properly integrated into the wall structure utilizing multiple sealing layers. A weatherboard system of layering is used during the installation process, which ensures that the harsh winter rains will not be able to penetrate into the walls.

Window Installation, cutting siding away

Siding is cut out around the old window exposing the nail fin.

Window Installation, removing old window

Old window is removed completely and the opening is cleaned.

Window Installation, interior surrounds are cut back

Interior surrounds are cut back to allow new window to fit properly and sealant is applied behind the nail fin.

Window Installation, new window installed, leveled, plumb and squared

Window Installation, flashing is installed over the nail fin

New window is installed level, plumb and square. Flexible flashing is installed over the nail fin in a weatherboard fashion.

Window Installation, exterior trim installed, finish caulking, cleaning of window

Exterior trim is installed prior to final finish caulking and cleaning of the new window.

Many older homes with wood windows will be installed using the slope sill box frame method of installation. This method entails removing the movable sash of the old windows and installing the new window within the existing frame of the old window.

Wood Framed Window Installation, removal of interior stop and bottom sash

Removing the interior stop to enable removal of bottom sash.

Wood Framed Window Installation, removing bottom sash after disconnecting weights

Removing bottom sash after disconnecting weights.

Wood Framed Window Installation, removal of parting bead to remove top sash

Taking out parting bead which
allows top sash to be removed.

Wood Framed Window Installation, window frame opening cleaned and fresh caulk applied

Back bed of caulking after sash
is removed and opening cleaned.

Wood Framed Window Installation, installing of new windows

Installation of new window
working around obstacles.

Wood Framed Window Installation, final finish caulking to window frame interior and exterior

Final finish caulking on interior and exterior.

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11819 A NE Hwy 99, Vancouver, WA 98686