Reihys y system rafter jeh mullagh hip
Soilshaghey magh tommanyn ry-hoi ayns millimeteryn;
Y - Ard y mullagh;
X - fad thie.
Z - Leed thie.
C - mhean s'inshley jeh'n 'eaves'
U - Leed y rafter
W - Tiughid y rafter
S - Pitch rafter
O1 - Leed ny boardyn sheathing
O2 - Thie board sheathing
R - Step lath
Cooidjagh y phrogram.
Reihys y structuur truss.
Determination y mraane ymmyrchagh jeh studeyryn towse son rafters.
Ta'n volume jeh'n boardyn sheathing.
Dimensionyn exact jeh ooilley ny rannagyn jeh'n system rafter.
Taarnyn mishaghey jeh mullagh hip, rafters, sheathing.