Bow and bay windows are sought after by homeowners to make a bold statement. Curb appeal is often enhanced by replacing a few standard double-hung windows on the front of a house with one large "showcase" window that projects outward from the exterior wall of the home. By extending the facade in this manner, you are afforded the ability to construct an interior window sill onto which you can set vases or other floral arrangements, fine porcelain or even trophies, if your heart desires. I had a customer several years ago who purchased a large bay window for one simple reason: to allow his cat a place to comfortably lay in the sun.
As with all replacement windows, there are many factors you must take into consideration when purchasing a bow or bay window. First and foremost is the energy-efficiency of the product. Remember, these windows are much larger than traditional double-hung windows, the ones you will likely find in your bedrooms. As such, there is substantial glass surface area which will be exposed to the elements. Choose a window with poor glass and you'll be miserable for years to come.
Similarly, the frame of the window is of paramount importance. Most replacement windows are made of vinyl, which does an excellent job of resisting heat or cold. Many manufacturers will offer an option to add insulation to the interior of this frame, which is traditionally hollow and multi-chambered, similar to a honeycomb. Always demand a welded vinyl master frame. Such a large window will require a welded frame to ensure its structural integrity.
Be certain to ask your window contractor for the "U-factor" of his or her window. This will inform you as to the efficiency of the bow or bay window. The lower the U-factor, the better its insulation properties will be. Next, consider whether your new window will have fabric curtains or furniture nearby. If so, the large expanse of glass will allow harmful solar rays to fade these materials and colors over time. Insist on a low-emissivity or "Low-E" glass coating. This barely perceptible coating will reflect the UVA and UVB rays, keeping them from destroying your furnishings.
The interior window sill on a bay or bow window can be vinyl or wood. Often, birch is the wood chosen by manufacturers for its beautiful wood grain. Be careful if you plan to place plants on this window sill. When watering, any overflow will damage the wood before long. It may be best to opt for a vinyl sill if this is your intention. If instead you plan on placing a large vase or artificial flowers on your new sill, birch will be your most attractive option. A wood sill can be stained and a polyurethane coating applied to not only protect it, but to complement your home's interior. Often we will stain a sill to match a wood banister or hardwood flooring in a customer's home.
