What is a Concrete Window Sill?

Whatever room you're in at the moment, take note of how the window and window sill add beauty to the room. Windows and window sills come in a variety of materials such as concrete, wood and vinyl. The concrete window sill, while only concrete in name, typically is a composite because it is combined with a mix of special fibers. These fibers help keep the concrete from cracking by giving it some flexibility.

Cast stone is currently very popular in the masonry field. Cast stone is thought to be stronger than most of the natural stone used in buildings. Many are choosing window sills made of reinforced cast stone because they provide the beauty of natural stone with a much sturdier construction.

It is important that the design of a building's facade prevents heavy water flow or concentrations on the walls. Otherwise the building's walls will quickly lose their beauty. The most important of these facades are the projections and drips such as the copings, roof overhangs and window sills.

A fixed sash window assembly's frame holds the panel of glass over an opening in an enclosing wall of the building. The sill on this frame is generally metal or plastic comprising a horizontal frame. This sill should be mounted at the window base on the building's foundation. An exterior sealing strip holds the top portion of the exterior flange. Any water that may get through the exterior seal strip drains out of holes formed in the web. The depending frame most exteriorly disposed has a horizontal ledge that extends out beyond the window base into the drain holes of the web. A wet sealing compound should then be filled in the space between the ledge, the leg and the foundation of the building. A drain shield on the outside edge of the web is used to protect the drain holes against backflow. Thus, the water is unable to enter the room through the window sill.

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