When planning a skylight installation, be sure to take into consideration the sun’s path. Skylights on the south- or west-facing portion of the roof will collect direct sun—skylights facing north or east may not get any direct sunlight.
Keep in mind one important fact: A skylight will only work in a room that is either directly below the roof or is below an unfinished attic space. If you want to install a skylight in a room that has an attic above, you’ll need to build a light shaft.
The shape of a light shaft controls the spread of the natural light beam. A shaft that’s flared on all four sides spreads light over the widest area; a perpendicular shaft with vertical sides focuses the light straight below. A shaft flared on only one or two sides sends more light in the direction of the flared sides.
Be sure any skylight you intend to install will meet local codes for load, wind resistance, and related factors. Building permits are required for installation in most regions.
Sizing and placing a roof window in an attic room so that it captures a view calls for careful planning. The roof’s slope will affect proper placement. A low-sloping roof will require a taller window than a steeper roof for the same amount of view. Manufacturers of roof windows have charts that list recommendations based on the slope of the roof.
