Gable Roof Dormer Additions
A Gable Roof Dormer provides Natural Light,
Ventilation and Living Space
By: Mark J. Donovan
A gable roof dormer addition is an
excellent way to open up an attic to let in more natural light and to create
more living space. Adding a gable roof dormer is also an ideal way to create a
bedroom or office space out of an otherwise unused attic. It also allows
ventilation to attic spaces. A gable roof dormer, sometimes referred to as a
dog house dormer, is also useful to accent the exterior of a home.
A gable roof dormer has a
triangle roof peak and includes a window in its gable end side.
A gable roof dormer addition has
its ridge line (or roof peak) positioned perpendicular to the main roof line
ridge, and has two sloping roof sides. With larger gable roof dormers their
ridge line frequently ties into the main roof ridge. With smaller gable roof
dormer additions their ridge lines usually tie into a header located some
distance down from the main roof ridge.
Gable roof dormer additions are more
expensive to build than a shed dormer, however they are aesthetically more
attractive and thus more frequently used on the front of homes, when a dormer is
When building a gable roof dormer
addition the load of it is either transferred into the existing roof rafters or
the attic floor. If the gable roof dormer it is to be tied into the main roof
rafters then the main roof rafters that will support the weight of the dormer
need to be doubled or tripled up.
Having the dormer addition tie
into the main roof rafters is usually preferable as it prevents the need for
creating walls within the attic space, thus maximizing the benefits of
adding the gable roof dormer addition.
When designing a gable roof
dormer addition it is always preferable to have the gable dormer roof pitch
be the same as the main roof pitch. In addition, the gable dormer soffits
should also be of the same proportion as the main roof soffits.
Photo by Mark Donovan
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