Specification

APPROPRIATE PROTECTION
for Exterior Doors (JGI030)
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and/or provision of this information. Any reliance upon the information or advice is at the risk of the party so relying. The information contained herein may be
changed from time to time without notication.
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The protection of your door is a major factor in its maintenance
requirements and longevity. To adequately protect your door and
extend its life, several factors must be considered. Door type,
climate, exposure, color choice and the use of a storm door all
have an effect on the durability of a door.
Every door type weathers differently. Wood doors, for example,
are more susceptible to the elements than steel or berglass. The
following are some guidelines for designing the best combination
of door material, overhang protection, and other factors affecting
the long-term performance of the door.
Overhang
An overhang as shown is
required for wood doors,
and recommended for
steel and berglass doors.
Overhangs protect the
door’s nish, minimize the
need for renishing and
help keep the weather out
of the home. An example
formula for determining the
correct overhang (in many
climates) is: D (Depth) = 1/2H
(Height). For example, if the
measurement from the base
of the door to the bottom
of the overhang is 10 feet,
then the overhang should
extend at least 5 feet. This
formula can change based on
the climate and the direction
the door faces. The following
section will explain how to
modify the formula based on
these factors.
climate & expOsure
Also consider the variables specic to your region. The climate and
the direction a door faces play a key role in determining a proper
overhang. Typically, southern and western exposures are harshest.
With southern exposures, the sun beats down on the door from
sunrise to sunset. In western exposures, the door receives sunlight
in the hottest part of the day.
(09/10)
Please consult the following chart and adjust the depth of the
overhang as needed.
Direction the door faces
Climate North South East West
Desert D = 1/2H D = 2H D = 1/2H D = 2H
Ocean D = 1/2H D = H D = 1/2H D = H
Wet D = H D = H D = H D = H
Mild D = 1/2H D = H D = 1/2H D = H
Without adequate overhangs, doors with a southern,
southwestern, southeastern or western exposure will require more
frequent maintenance. Doors without appropriate protection
may also experience performance problems such as rapid nish
deterioration, color fading, wood splitting, warping, moulding
shrinkage, wood joint separation, and water penetration between
the mouldings, panels, and glass.
With proper overhangs, doors may face any direction (north, south,
east or west). Doors installed in these types of applications still
require nish maintenance. Wood doors, for instance, may need to
be renished every two to ve years.
cOlOr chOice
No matter what type of exterior door is selected, color choice
may effect how quickly the exterior of the door weathers in
extreme climates. In general, darker colors absorb more heat than
lighter colors. The exterior face of a door exposed to the sun in
harsh environments can reach temperatures well in excess of 120
degrees. As a rule of thumb, if you cannot hold your hand on the
face of the door for more than 30 seconds, the door is too hot.
These extreme temperatures can cause noticeable damage to the
door including nish deterioration and accelerated color fading.
--Continued