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Insert window vs full frame12/31/2023 ![]() ![]() It is “Z” shaped and it has a large exterior flange that is designed to fit over the existing aluminum window’s perimeter frame that it is going over the top of. The zbar flange comes from the shape of the window. Zbar’s or Replacement windows are made by most manufacturers of vinyl or fiberglass windows. Installed in a Historic Building in Petaluma, Ca with a Brick Exterior Facade BEFORE: Original Wood Double Hung Window with Wood Sashes Prior to Installation of a Marvin Clad Ultimate Insert Double Hung AFTER: Two Marvin Clad Ultimate Insert Double Hung Windows with Hampton Sage Exterior and Primed Wood Interior. The interior of the windows shipped from the factory with a primed interior for finish painting in the field. By installing a Marvin Clad Ultimate Insert Double Hung into this particular opening the owner got a exterior to satisfy historical requirements in the downtown historic district and a maintenance free exterior. The original window frame were in excellent shape but the original wood sashes were completely rotted and the glass was falling out. The Marvin insert worked well in this application since the existing building is a brick facade. ![]() The aluminum clad exterior was chosen to match the original green exterior of the windows. This photo shows installation of Marvin Clad Ultimate Insert “Replacement” Double Hung windows in a commercial project in Petaluma, CA in Kentucky Street. The Tuscany features a 3 1/4″ jamb that allows the window to easily installed into old double hung frame that have a 3 1/4″ sash opening. The photo below shows a commercial and residential building in San Francisco, prior to the installation of Milgard White Vinyl Block Frame, Sloped Sill Tuscany Replacement Windows. The Tilt Pac is comprised of a new set of vinyl jamb liners with balance hardware and two new double pane aluminum clad exterior, wood interior sashes. The photo above shows the interior installation of Marvin Tilt Pac, insert windows being used to replace the original wood sash windows on a project in Petaluma, CA. Interior Photo of Marvin Clad Tilt Pac Window Installed by Old Town Glass in Petaluma, CA In the event the existing frame is damaged or rotted a new nail on installation should be considered. The existing frame should not have it’s installation compromised in any way. The existing frame section must be in good shape to make sure that the new window can be properly fitted and installed into the opening. One critical element for block frame replacement is the condition of the existing wood jambs and sill. Older homes including Victorians, Bungalows, and wood windows with masonry surrounds are usually candidates for block frame window replacement. The normal frame thickness on a insert window for a block frame is a jamb depth of 3 1/4″. Marvin New Construction or Nail On Window Photo Taken During InstallationĪ Block Frame window replacement is normally where the original wood perimeter frame is left in place and a new window comprised of either new jambliners and sashes or a complete frame unit with a jamb are installed. Most window and door manufacturers offer a solution to answer all type of installation but some of the higher end products (wood clad windows) cannot be installed using the Zbar or replacement flange method due to the waterproofing and jamb details for wood windows. Not all types of replacement window installations will fit every project. While the previously listed types of replacements all yield the result of a new window, there are some distinct differences that are important for owner’s to understand. These include Block Frame, Z Bar(or Replacement Flange), and New Construction (or Nail on Flange). There are a couple of window replacement methods common to the industry. I have tried to summarize the different methods for replacing a window along with common terminology. In certain situations there maybe more than one option available. When our estimators or installers look at a project, we are able to tell a customer the best window replacement method or methods based on their situation. Which Window Replacement is Right For My Project? It Depends. ![]()
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