Design Assistance Step 2 : Select Dimensions



Skylight Dimensions and Curb Requirements:

The size or dimension of the skylight itself is based upon the outer dimensions of the mounting curb or support structure. When measuring the curb, it is important to ensure that you measure to the outermost part of the curb (also known as out-to-out of curb). It is equally important that the curb itself be square (i.e. equal and parallel sides) and level. To ensure that your curb is square, measure the diagonal distance from each opposing corner. If the dimensions are not equal, than the curb is not square and must be modified prior to installing the skylight. Once you are confident that the curb is square and you have verified that the outer dimensions are correct, you may enter those dimensions into the spaces provided in Step 2 of the Design Your Skylight section.

Note: The mounting curb must be a minimum of 6 inches wide and be constructed to withstand the design loads produced by the weight of the skylight itself and any existing weather conditions (snow / wind). Specific design load support reactions are called out on the detail drawings, which may be downloaded at the completion of each design session. A steel or concrete curb is required for skylights larger than 10 feet in width.

Curb Layout for Pyramid, Ridge, Hipped Ridge and Polygon (similar)

Curb Layout for Ridge Skylight with Jamb Condition
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Length & Width Ranges:

e-skylight.com allows you to customize the width and length of your skylight to suit your specific project requirements.

All Units: Enter any pitch from 15 to 45 degrees.

Ridges and Hipped Ridges: Units can be any width from 4 to 20 feet and any length from 4 to 100 feet (Ridges) and 6 to 100 feet (Hipped Ridges).

Pyramids and Polygons: Units can be any width from 4 to 20 feet.

Due to shipping restrictions, units can be factory assembled and glazed up to a maximum width of 8 feet.

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Pitch Ranges:



PitchPitch Angle
4/1218.44°
6/1226.57°
7/1230.27°
10/1239.81°
12/1245.00°

The pitch of a skylight is calculated by the using the formula: pitch = arctangent of the rise / run. You may enter any degree of pitch from 15° to 45° or refer to the table above.

The pitch of your skylight will ultimately determine the overall height of the unit. For instance, an 8"x 8" pyramid with a 15° pitch would have an overall height of approximately 19 inches while the approximate height the same pyramid with a 45° pitch would be 54 inches.

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