Calculation of materials for the mansard roof

Calculation of materials for the mansard roof
Specify the dimensions of the roofheight Y height Y2 width X overhang C Length B roof materialsThe width of the rafters The thickness of the rafters The distance between the rafters The distance from the edge to the roof rafters The width of the batten boards Thickness of boards lathing The distance between the boards lathing The height of the roofing sheet The width of the roofing sheet lapping
Dimensions in terms of one half of the main roof.
Initial data
The width of the rafters 15cm
The thickness of the rafters 5cm
The main roof overhang 30cm
Width of the main roof on the walls 300cm
height Y 200cm
height Y2 40cm
The length of the main roof (horse) 370cm
The size of the main roof
The height of the main web of the roof 300cm
The width of the blade (the skate) 370cm
The area of ​​the main roof 11.1(22.2)square meters
rafter length 300(250+50)cm
Number of rafters 6(12)
The volume of material rafters 0.14(0.28)cubic meters
Number of rows batten boards 15(30)
Displacement batten boards 0.2(0.4)cubic meters
The number of roofing material 11(22)sheets
2series in 5.5sheet width on each half
The underlay material (asphalt, roofing material ...) 30square meters
when the joint it < 25%