Windows Interior Finishes

The newly installed windows generally require some form of interior finishing (between the new window and wall). These may include jamb extension, molding or casing.

Casing (i.e. interior trim placed around the window) is a decorative choice for the majority of homeowners. This is so because it would normally match the baseboards and the other trims present around the house. CANPRO Windows and Doors offers classic CANPRO trim (2 sizes available – 2 ¾ inches and 3 ½ inches wide) and two different corner pieces, namely O and V. The usage of CANPRO casings has become quite popular in the recent times as no painting is required with them. They are also the best and safest choice for kitchens, bathrooms and other parts of the home that are subjected to moisture.
CANPRO Windows and Doors can install any kind of CANPRO, wood or MDF trim available at your local hardware stores based on your choices and preferences as a homeowner.

Since a window is not nearly as thick by itself as the walls of the house, it generally requires some extension or ledge. A jamb extension is mainly the ledge that’s attached to interior part of the window for matching the thickness of the wall.
Typically, the jamb extensions are made of CANPRO or wood.

Certain window installations might require moldings. For instance, some home owners like their current window casings and jamb extensions and would prefer to keep them. If such is the case, then a brand new CANPRO window can be installed into the existing frame (i.e. retrofit installation). New Moldings will be used to make excellent finish between existing jams and newly installed windows.


  • Cranks out open from the bottom up
  • Three layers of weather stripping prevents drafting
  • Collapsible lock and handle that doesn’t interfere with curtains & blinds
  • Tough aluminum screen frame with fiberglass mesh
  • Beautiful exterior frame profile for an eye catching curb appeal
  • Excellent choice for a triple pane glazing system


Windows, skylights and doors are not generally assigned with an R-value when they are being tested. Nevertheless, window salespeople and contractors may often refer to an R-value for measuring the window performance.

R-value serves as a measure of the resistance to flow of heat. In order to understand this

R-value system in a better way, you can sample U-factors in metric as well as imperial units that have been perfectly converted to the R-values in this following table. Since the ER values are actually derived from a mathematical formula that makes use of U-factor as well as solar heat gain, there’s no method for directly converting the ER value into an R-value.

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