Skylight / July 11, 2018 / Nicolas Charlebois
The acrylic dome is typically mounted in an aluminum frame which is in turn mounted on a box called a "curb." Once the hole is cut in the roof to the manufacturers specifications the curb is typically constructed on-site to raise the skylight above the level of the roof sheathing. Site-built or factory-supplied flashings are used to seal the roofing around the curb. Domed skylights are available in clear smoked bronze or other tints. Some domed plastic skylights are flush mounted which means that the lens piece and flashing piece are both made of plastic and then placed on the roof without a curb. The problem with this type is that they are loud and very susceptible to leakage.
For one thing skylights are positioned in such a way that they are inaccessible unless they are operated by remote. Even in cases of motorized skylights which are easily manipulated there are still some disadvantages that are inherent to skylights that are not present or minimized in windows. Vertical windows lose less heat by convection when compared to skylights. Also since windows are generally protected by overhangs or shrubs they lose less heat by radiation. On the other hand skylights are directly exposed to the sky. Thus they lose more heat by radiation. Proper insulation can reduce this heat loss to a large extent. In the summer season skylights are more exposed to the direct heat of the sun than windows.
There must be a clear opening in the area where the skylight is to be placed. A skylight that faces the East lets in plenty of morning sunshine while one that faces the West brings lets in the afternoon sunshine. It is important to know the amount of light and the type of light your skylight lets in. Afternoon sunlight can become uncomfortably hot if you live in a warm and dry place. The size of the room also has a bearing on the effectiveness of the skylight on your roof. If the room is small your choices are severely limited as skylights are best suited for large rooms. If you still want a skylight for a small room it is best to opt for an elegant pyramid skylight. This gives the illusion of space.