Block Glass Windows

{{Infobox
|title = Block Glass Windows
|image        = [[File:Space holder.jpg|215px|alt=Block Glass Windows]]
|header5 = Other Names
|data6   = Block Glass Replacement Windows
|header7 = Description:
|data8   = Cubes of clear or clouded privacy glass blocks used as a non operable alternative to other windows and installed in batches.}}

Block glass windows are a good alternative for a room in which the homeowner wants additional natural light but does not need added ventilation. These non-operable windows are manufactured by different window manufacturers, allowing the homeowner to review the choices and select from varying glazing alternatives, framing materials and insulating options.  Replacement block glass windows may be assembled using cloudy privacy glass or produced with one clear pane of glass. They are easy to install which offers a savings on window installation costs.

== Replacement Glass Block Windows ==
Glass block windows present a cost-effective window option for homeowners who are replacing some or all of their home's windows. The block glass replacement windows are less costly than operable windows since block glass windows do not require either operating hardware or a sash. Glass block windows can include glass panes with clouded glazing to increase privacy or clear glass panels which increase the light flow into the room. Block glass windows of any size add a stylish appearance to a room. 

=== Window Options ===
Installing glass block replacement windows is a popular choice for homeowners who want to increase the window space in a room that receives limited natural light. Block glass windows with privacy glass provide light for a small room, such as a bathroom, while maintaining the room's atmosphere of seclusion. Replacement block glass windows with clear glazing can be installed as a single window in a window opening or as a compliment to another type of window -- above, below or along the side of an operable window. 

=== Energy Efficiency ===
Block glass windows are available in single, double or triple glazing. Many window manufacturers offer insulated window options. They sell multi-pane block glass which they insulate by pumping krypton or argon gases in-between the window panes. These gases prevent the transfer of heat and cold so that a hot day, the room will not lose cool air through the windows while on a cool day the room will not lose its heat through the window panes. 
 
Other insulating options for a replacement block glass window include single-pane acrylic glass and acrylic glass block window inserts. The UV inhibitors in these windows help to cut down on the thermal gain during the warm summer months. 

Some window manufacturers have a "Low-E" -- low emissivity -- coating option for replacement glass block windows. The low-e coating suppresses the radiative heat flow and blocks the heat caused by sunlight. This coating is a efficient insulator on windows which are in the path of direct sunlight. 

The framing materials of the window is a determining factor in the glazing options. Windows made with stronger framing materials, such as aluminum clad and fiberglass feature more effective insulating options for the glass panels. 

Increasingly, states offer rebates for homeowners who replace their old windows with energy efficient replacement windows. Each homeowner should check with his or her state's Department of Energy to determine the rebate options that are available in that particular state.   

=== Patterns ===
Many homeowners use glass block windows as privacy windows, most often for bathroom and basement windows. These areas of the house need a light source but the glass must provide privacy. Privacy glass clouds the glass pane, permitting light to enter while preventing passer-byers from gazing into the room. Various privacy glass patterns are available for replacement glass block windows including diamond, wave and other view-distorting glass patterns.

=== Considerations ===
A major consideration when installing a block glass window is the room's ventilation. Block glass replacement windows are appropriate for rooms that have plenty of existing ventilation and do not need the extra opening, other than to increase light or as an element of the room's architectural design. A block glass window, in conjunction with other operable windows, can add elegance to a room's appearance and make the room feel more spacious and stylish.  

=== Sizes and Shapes ===
Replacement block glass windows are available in a variety of shapes and sizes including squares and rectangular shapes. Homeowners can order standard sized block glass windows in sizes anywhere from twelve inches in height or width all the way to 72 inches or more. The dimensions of the wall's opening will give the homeowner the needed data to plan the replacement block glass window's measurements. 

=== Placement ===
There are numerous architectural designs in which a replacement block glass window will serve as an asset to a room. Block glass windows can be placed anywhere in the architectural plan including the center or outer flanks of a bay or bow window, in a bathroom or basement or even under or over a casement or double-hung window. Replacement block glass windows offer an attractive solution for increasing light into any area of the house.

=== Block Glass Window Frames ===
Replacement block glass windows are available in a variety of framing materials which will suit any type of home construction and budget. Homeowners who are working with a tight budget can purchase replacement glass block windows in vinyl or aluminum frames. Vinyl frames are popular low-cost frames because they are durable and need little maintenance. The color doesn't fade easily and vinyl frames resist corrosion and moisture. Industry experts see vinyl frames as good insulators provided that the installer carefully insulates the cavities in the window frame and sash. 

Another low-cost alternative replacement block glass window is the aluminum frame window. Aluminum frames do not require maintenance after installation but can be problematic. Aluminum frames are, themselves, a cool surface and this causes condensation to form on the windows during cold weather. 

Fiberglass is a relatively new framing material which offers good insulation. The material is light and durable. Replacement fiberglass block glass windows are more expensive than either vinyl or aluminum windows. 

The increasingly-popular aluminum-clad wood windows provide a strong wood window with an exterior clad casing which protects the wood and insulates the window frame. Most wood clad windows are double or triple-pane windows, offering a good energy-efficient window alternative. 

Although clad and fiberglass windows are more expensive window options for replacement block glass windows, they will save the consumer money over the long run in lower energy costs. In addition, rebates for energy-efficient remodeling costs from the homeowner's state Department of Energy can offset some or all of the difference between window frame types. 

=== Interior Moldings ===
Homeowners may include interior trim in their window order when they order their block glass windows. Some window manufacturers include the interior molding as a standard window order feature while other customers will select their interior trim separately from a window-supply store, home center or lumber yard. There are many different kinds of trim profiles which allow homeowners to create their preferred look for their window moldings. 

=== Accessories===
Replacement block glass windows can be ordered with grilles which are factory-installed between a window's double-panes. Block glass windows also have the option for pop-out grilles which allows for easy window cleaning.

[[Category:Replacement Windows]]