Bit of a random one from me, was stumbling around youtube looking for something else and saw this short video of a guy explaining the difference between a Ridge Board and a Ridge Beam. https://lnkd.in/ekRnmEaP Very much university level learning, but still a solid video, and we still apply this on Visual Condition Surveys when assessing existing roof structures and understanding where the load is going. Nice demo. . . . . #refurbishment #design #london #structures #structuralengineering #construction #building #structuraldesign #structure
The Difference Between a Ridge Board and a Ridge Beam
https://www.youtube.com/
Ruben Wood
3 个月
This comes up so often with architects and builders!
Andre Sandiford
2 个月
Learnt from this video, thanks for sharing Sean.
Principal Engineer at ECOS MACLEAN Ltd - emphasis on precision diagnosis and solutions
3 个月The American sales video is long-winded but is not complete in describing the structural issues. Sorry, Hooke's Law again comes into play but is fundamental to understanding structural load path. Our old roofs with 4x2 rafters have lesser ridge boards 7x1 commonly. Yes, if not restrained at eaves by a ceiling or when not a long slope, an eaves plate can act as a horizontal beam between ties ...for the 'cathedral' roof. And yes, for the beam to be loaded (gravity takes the load down the rafters unless 'hung' from beam) hangers are necessary. But even then, deflection of the beam will cause eaves spread from simple geometry and given axial stiffness (tensile or compressive) of the rafters comes into play(length change) it is possible that majority of roof loads goes up the rafters as unrestrained wall just moves outwards! So ridge beam taking half the load will be unfer designed with consequences for strength/deflection of it. Very complicated to assess ridge beam load accurately. But how often is there not a ceiling which easily ties the eaves and renders a ridge beam daft and pointless (especially steel) when behaviour is just a board to lean against and no vertical load at top end of rafters. This video needs a health warning.