See the image below for more explanation on rise run and pitch.
Pitch of roof truss is taken as.
Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the span in inches.
The pitch of the truss is an important factor in the selection of a truss.
Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.
A sample calculation would be.
Slope for roof is necessary to drain off rain water falling on the roof.
A roof that rises 1 inch for every 4 inches of its horizontal distance has a 1 4th pitch.
It can take various forms and often used for aesthetic purposes adding height and focal interest to the ceiling.
While pitch and slope are used interchangeably they are not the same span also known as gable width this is based on the total footprint of the house and refers to the distance between two exterior walls.
The pitched or common truss is characterized by its triangular shape.
It is most often used for roof construction.
A pitch truss with a sloping or non sloping vertical interior ceiling detail.
Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber.
The chord size and web configuration are determined by span load and spacing.
Pitch this is the incline of the roof expressed as a fraction.
This type of truss is perfect for the dining room living room great room and kitchen.
Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
Roof pitch refers to the slope which the rafter creates.
They are designed at a 4 12 pitch to be spaced 2 foot on center.
Some common trusses are named according to their web configuration such as the king post fan fink or howe truss.
The pitch highest point of the roof is an important ratio when measuring the truss.
The best outcome of the pitch depends on the covering of the roof.
Most economical when the difference in slope between the top and bottom chords is at least 3 12 or the bottom chord pitch is no more than half the top chord pitch.
The slope of the top chord members or the ratio of rise to span of a truss is called the pitch of the truss.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
