D1: Typical Rafter Model
D2: Sill Model
D2a: Sill Model
D3: Hip Rafter Model
D4: Purlin, Flush Glazed Model
D4a: Purlin, Capped Model
D5: Apex Model
D6: Head Model
D7: End Rafter Model
D8: End Glazing Model
D9: Vertical Sill Model
D10: Ridge Model