The Development Of The English Timber Roof

Braced Collar Truss
  1. Ronf with braced collar and scissors truss above.
  2. Roof with tie-beam strengthened by wall-posts and braces, collar also arch-braced.
  3. Roof with collar-beam arch-braced to wall-posts.

13. Ronf with braced collar and scissors truss above.

Pendentive Timber Roof
16. Roof with hammer-beams. The braces of the collar are taken * own to arch-braced hammer-boems.

14. Roof with tie-beam strengthened by wall-posts and braces, collar also arch-braced.

17. Roof arch-braced to wall-posts without collar or hammer beams.
20. False double-hammer-beam roof. The collar-braces are taken to the back of the upper tier of hammer-beams, which, therefore, carry no weight.
  1. Roof with collar-beam arch-braced to wall-posts.
  2. Hammer-beam roof with hammerposts and wall-posts. Both hammer-beams and collar are arch-braced.
  3. False single-hammer-beam roof (pendentive) (Eltham Palace type). The hammer-posts bear on the tenons only of the hammer-beams, not on the beams themselves.
19. Double hammer-beam roof with hammer-posts ; arch-braced kingposts from collar to ridge.
  1. Hammer-beam roof without wall-posts. The arch-braces are continued past the hammer-beam to the corbels and act as wall-posts.
  2. Arch-braced roof with posts. (The progenitor of the rili of Xo. 24.)
  3. 44. OF THE ENGLISH TIMBI
  4. Hammer-beam roof without wall-posts. The arch-braces are continued past the hammer-beam to the corbels and act as wall-posts.
  5. Arch-braced roof with posts. (The progenitor of the rili of Xo. 24.)

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