Measuring for your Skylight
Size is typically the most important factor in purchasing and installing
a skylight. While both size and position will determine how much
extra light is admitted to the space below, size is the dominant
factor. Use the following "rule of thumb" for sizing a skylight:
the skylight size should never be more than 5% of the floor area
in rooms with many windows and no more than 15% of the room's total
floor area for spaces with few windows.
Keep in mind that the measure is absolutely critical! It must be
accurate and needs to be based upon typical industry reference points
as provided below. Nothing can be more frustrating than receiving
the wrong sized material. Although it is nothing to be afraid
of, we would encourage you to familiarize yourself so as to avoid
a potentially costly mistake.
When ordering or describing a skylight, the measurements are always
expressed as width (dimension horizontally across the roof)
x length (dimension vertically up the roof).On venting skylights,
the hinge will be on the width dimension.
Thermo-Lite series skylights are fitted into an opening in the
roof. The 'rough opening' is the size of the hole built into or
cut into the roof to accept the skylight. The actual size of the
skylight will be 1/2" smaller in both width and length, allowing
some ability to adjust the actual skylight position within that
Metro-Lite series skylights are mounted onto curbs on the roof.
Curb Mounted frame sizing is taken from the Outside Curb Dimension.
The Outside Curb Dimension is the overall OD (outside dimension)
size of the of the finished built up curb. Importantly, this
also includes the applied roofing materials as taken from the top
of the curb where the skylight is to fit. Skylights are sized slightly
larger than the OD of the curb in order to fit over the top
like a crown, and reference what is commonly referred to as
the Inside Flange Dimension, also known as the Inside Aluminum Dimension
or the Inside Unit Dimension. The important issue here is that
you provide us with the proper OD of the curb. We can assist
you with the rest!
THERMO-LITE SERIES COPPER FLASHED SKYLIGHTS
(Width x Height)
||14½" x 30½"
||14½" x 45½"
||14½" x 60½"
||22½" x 22½"
||22½" x 30½"
||22½" x 45½"
||22½" x 60½"
||22½" x 72½"
||30½" x 30½"
||30½" x 45½"
||30½" x 60½"
||30½" x 72½"
||45½" x 45½"
METRO-LITE SERIES CURB MOUNTED SKYLIGHTS
Outside Curb Dimension
(Width x Height)
||25½" x 25½"
||25½" x 33½"
||25½" x 37½"
||25½" x 49½"
||33½" x 33½"
||37½" x 37½"
||37½" x 49½"
||49½" x 33½"
||49½" x 49½"
Should you need a skylight size that is not included in the size
charts above, don't worry: both the Thermo-Lite and Metro-Lite series
skylights can be ordered in custom sizes. Please use our Custom
Sizes page to request a quote for your custom size skylight..