A 12 in 12 pitch is a steep 45 degree angle roof.
Steep pitch roof trusses.
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These two chords meet at the truss s apex.
The steep pitch creates a tall truss that has a lot of room for webs or in many instances the opportunity for an attic space in the interior of the truss.
This type of truss is perfect for the dining room living room great room and kitchen.
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Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.
The pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run.
The rise will be the elevation change over the 12 inches.
Since it has steep sides there is sufficient room for a living space below the roof or can be used as a storage space in the attic.
The gambrel roof truss resembles the appearance of a barn roof.
See the image below for more explanation on rise run and pitch.
A pitch truss with a sloping or non sloping vertical interior ceiling detail.
It has two upper chords with one longer than the other.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
For example a slope of 6 12 means for every 12 inches of horizontal distance the slope of the roof will rise 6 inches vertically.
Gambrel trusses create a similar structure to what would be found in a stick frame barn structure with a steep pitch from the walls transitioning to a low pitch closer to the peak.