The same concept holds true for roof trusses.
Roof trussers distance.
The trusses should be a little longer than the exact width to allow for overhang and you will need sufficient trusses to mount across the length.
So the space between rafters can be greater without reducing the maximum span.
These standards are as follows.
The roof span is the distance between the outsides of the walls that will support the roof.
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.
These steel joints are needed to support the overall truss.
Once you ve calculated the number of trusses you will need you should purchase the lumber.
The more complex the truss framework is the greater quantity of these joints will be required.
Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet.
Putting the trusses into place.
The average roof will overhang the side walls of the home by just a small amount 12 18 inches.
Typical roof truss spacing means that they are usually about 24 inches from centre which means at the centre of one truss there will be a two foot gap or twenty four inch gap until the centre of the next truss.
The same thing is true for the bridge of the truss.
The run forms the base of a right angled triangle with the height that is equal to the rise of the roof.
The rafters of the truss will be used as the hypotenuse highest part of the triangle.
Half of that distance is referred to as the run.