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Lower bound and upper bound of the year in which the building was first completed (e.g. 1930-1940). This is the best estimate of construction date if it is not known precisely.
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Structural steel members are connected together with steel rivets. Riveted connections are no longer used, however they can be found in buildings built before 1950s (this date may differ depending on the country).
Riveted connection, Canada (Ojdrovic Engineering)
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Any steel construction type that is known but does not fit the descriptions of the other steel construction types in this table.
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Recording the number of storeys below ground as a range can be used where there is a lack of certainty about the exact number of storeys below ground but the surveyor is able to determine a range. This does not include the ground floor. It includes storage and mechanical plant levels only if these cover over 50% of the plan area.
HBBET:a,b
where a=upper bound and b= lower bound for the range
Example: HBET:2,1
(between 1 and 2 levels of basement)
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Wooden beams or trusses and joists, supporting light roof covering, e.g. corrugated sheets. Also includes curved roof structures e.g. vaulted roofs.
Timber beams and joists supporting light roofing, New Zealand (W. Clark)
Wooden roof truss structure, Cuba (S. Brzev)
Wooden roof truss, California, USA (S. Brzev)
Wooden structure supporting wooden planks and steel sheet roofing, Chile (S. Brzev)
Wooden truss structure supporting light metal roofing, Chile (S. Brzev)
Wooden roof structure supporting light metal roofing, Indonesia (J. Bothara)
Wooden beam and joist roof, Peru (S. Brzev)
A church with a vaulted wooden roof in Curico, Chile damaged in the 2010 Maule, Chile earthquake (M.O. Moroni)
Curved wooden glulam beams supporting light metal roof covering, Canada (S. Brzev)
A roof structure consisting of steel decking supported by wooden glulam beams, Vancouver, Canada (S. Brzev)