The Importance of Window Sizes


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Window sizes play a crucial role in home energy efficiency, comfort and aesthetics. They also make a room look bigger and allow more light into a space.

Window sizes vary based on the style of window and a few other factors. These include width and height.

Width

Window sizes vary by manufacturer and product line, but standard window widths for double and single hung windows range from 24 to 48 inches. There are also casement, bay and picture window options that can be wider than that.

In order to ensure the new window will fit, it’s important to measure carefully and correctly. To do this, measure from jamb to jamb on both sides and in the middle.

It’s best to use a tape measure, as it’s easier to keep the length constant and avoid accidentally measuring past the head of the window or sash stops.

Depending on the style of window, you may need to measure for decorative finials that are mounted along the bottom of the window treatment. These add a little more width to the finished product, so it’s best to leave room for them when calculating the final measurements.

Height

The height of a window can be an important part of the overall design. It can affect how much natural light enters a room, as well as how much privacy a homeowner can enjoy.

In general, windows should be located at a reasonable height from the floor. This height may vary depending on the window type and the building.

Typically, the standard height of a window from the floor is between 34 and 36 inches. This height allows for easy viewing of the outside while ensuring safety in the case of an emergency.

The standard height of a window is also an important part of energy efficiency and the overall comfort of the home. The height of a window should not be higher than the main door, which is often about 7 feet (2.1 in meters) or 8 feet for 10 foot ceilings.

Rough Opening

When ordering replacement windows, a framer will need to know the rough opening size required for the window to be installed. This size is used to determine the standard window size for that manufacturer.

The standard window size is a four-digit notation that includes the window style’s width and height measured from the rough opening. The first two digits represent the window’s width, while the second two digits represent its height, measured in feet.

The framer will also need to know the window’s net frame size, which is about half an inch smaller than the rough opening. This is necessary for flashing to be properly installed and the window to be made plumb before installation.

Final Measurements

Windows can be difficult to measure because they may be different sizes in each room, but it is crucial that you get exact measurements before purchasing replacement windows. Having accurate window sizes will prevent leaks and crooked windows during installation.

To find the final measurements of your windows, take the shortest measurement for height and width and round it down to the nearest 1/8 inch increment. This will serve as the basis for ordering your replacement windows.

For the rough opening width, measure horizontally across your frame from each side jamb at the top, middle and bottom. The smallest of these three figures should be circled or highlighted.


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