on-center framing. You can compare the U-values as well as heat and light transmission rates of various skylights. whether your home has trusses, compose certain the installer sticks with units made to fit within roof members, or gangs several smaller skylights together to create a larger window.

Even though tinted glass is available, I generally recommend that you stick with clear glass considering it lets in more light. Just like windows, skylights are rated for their thermal efficiency by the National Fenestration Rating Council. The kit won’t add much to the cost, but it will mean a leak-free installation.

Skylights come as venting units, which open, or as fixed units, which don’t. But it’s fundamental to build certain the room has adequate ventilation so condensation doesn’t become a problem. Although they are cheaper initially, the bottom line is they don’t last and many of them leak. A vent fan for a small bathroom should supply 1 cu.

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The short, dreary days of winter are a good duration to think about adding skylights to brighten up dark rooms. The better choice is a high-quality curbed skylight with energy-efficient glazing — and the factory flashing kit made for it. But I advise my clients to stay away from inexpensive units with plastic glazing. ft. per minute of air circulation per square foot of floor area, or about eight air changes per hour. Adding a large skylight means that the installer will cut one or

more rafters (see illustration). that is not difficult when the roof is conventionally framed — rafters on the sides of the rough opening are doubled up and headers are added at the top and bottom of the opening. Trusses are carefully engineered to carry roof loads, and modifying them in the field is a poor view. So unless the skylight will be easily accessible, buy the fixed unit and save yourself some money.

This even applies to putting a skylight in a bathroom. whether intense sunlight does cause too much heat buildup or begins to fade carpeting and furniture inside, add a shade or screen.

Skylights are available in sizes that fit standard 16- or 24-in. Even small units assemble a big difference in the way rooms look and feel.

There are many qualitys and several styles to choose from. In fact, many customers who order them later tell me they rarely bother to track down the special rod needed to operate their windows. A venting unit might seem like a good concept, but it is inconvenient to open and close when it’s out of reach. For more on sizing a vent fan, go to the Website of the Home Ventilating Institute.

Old-fashioned skylights were simply a one thickness of glass in a frame, but today they come with laminated or tempered glass, and low-e and tinted coatings to control heat transmission and UV radiation. But a truss roof is different.

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