Reihys ny rafteryn.

Reihys meanyn as ushtaghyn rafter

Soilshaghey magh tommanyn ry-hoi ayns millimeteryn;

X - Leed thie.
Y - Ard y mullagh;
C - mean y chrosh;
Z - astyr veih rimmey y board gys toshiaght y gherrid
B - Leed y rafter

Kiune

Gyn rafters, cha vod y t’oor ve jeant.
Lesh structuur y t'oor gable, shegin da ymmyd y yannoo jeh'n rafters, y ghrogh-angle as ny grooves.
Ta'n programme rheynn rafter er ny yannoo son shoh.
Bunait er y lheid y thie, t'eh ry-hoi y h-ardjyn veih toshiaght gys ridge y t'oor as leed y h-overhang, y h-ardjyn jeh'n rafter as y h-ardjyn gys y groove.
Ta'n program tarroogh myrgeddin tarraing jeh'n rafter lesh dimensionyn. Ta shen ard-fheuiltagh da’n luchd-obbree dy yannoo rafteryn lesh nyn laueyn hene.