If the bottom chord of a roof truss functions as a floor joist such as in an attic room it carries a live load that also varies by use but a typical live floor load for a residential space is about 40 pounds per square foot.
Roof truss self weight.
The rise will be the elevation change over the 12 inches.
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.
Tile weight 575 n m 2 truss self weight 75 n m 2 battens felt 35 n m 2 685 n m2 where a rafter bay forms part of the room in raised tie and attic trusses an additional load of 250 n m2 is added for the ceiling finishes.
Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run.
The truss extends from one end to the other approx 50 long.
You need not to use formulato calculate the self weight.
The truss are 36 in height.
The soffit weight approx.
However i am wondering if the drawings indicate the truss is to be designed for 20 psf ll and 10 psf dl does the truss manufacturer include the self weight of the truss in that 10 psf or is the 10 psf considered a superimposed dead load and they add in the self weight of the truss separately.
These trusses the meet building code criteria as specified by structural building components of america sbca and the truss plate institute tpi.
The live loads a truss is required to bear are determined by local building codes.
Asphalt shingle or asphalt fiberglass composite shingle 2 7 lbm ft2 13 2 kg m2 metal roofing aluminum or steel panel sheet or shingle 1 2 lbm ft2 5 9 kg m2 terne plate copper bearing steel sheet 0 7 lbm ft2 3 4 kg m2 wood shingle or shake 2 4 lbm ft2 11 7 kg m2 zinc roofing 1 6 lbm ft2 7 8 kg m2.
The studs are metal.
The run or the base number is 12 inches.
They are designed at a 4 12 pitch to be spaced 2 foot on center.
It is very easy to calculate the self weight of the truss.
Total floor area less than 200m2 and where roof shape calculations have not been made the.
This includes the roof deck and the supporting structure typically roof trusses and or rafters as well as the roof system itself.
Medium term loads for small buildings ie.
4000 00 pounds with 1 4 drywall.
Pre manufactured stock trusses are constructed with spruce pine fir spf or southern yellow pine syp lumber.
When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary.