Graphical Construction Glossary >> Roofs and roofing. >> Roof Trusses >> Raised cruck
Given that trees of a certain kind only grow to a particular size the early cruck builders had two choices, either make the structure wider at the expense of less height, using center columns as needed, or to go higher but with less width.
To a certain extent the raised-cruck gave builders the best of both worlds. Either using timber walls or if a good source of stone was available then masonry walls.
This interior view shows the space and height required to allow large hay wains and drays to be able to comfortably unload and store large quantities of produce.
Because of the lack of tie beams on the raised-cruck-trusses these roofs exerted tremendous outwards thrust on the supporting walls. The answer was to build stone buttresses at the truss positions to stop the wall spreading.
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