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Significats de principal rafter en anglès

One of several parallel sloping beams that extend from the ridge to the wall-plate, to support the roof and its associated loads; the sloping top member of a roof truss, which carries the purlins.

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Ús de principal rafter en anglès
1
Inside the Hut extra struts were introduced, stiffening the principal rafters on the southern side.
The Home of the Blizzard / Being the Story of the Australasian A...
2
Hence generally, in buildings of stone and marble, the mutules are carved with a downward slant, in imitation of the principal rafters.
The Ten Books on Architecture