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2. Domestic roof construction - Wikipedia

   en.wikipedia.org/wiki/Domestic_roof_construction

   A truss roof with tongue and groove sheathing. The gap in the sheathing at the ridge is the space designed to allow natural ventilation. Pre-manufactured roof trusses come in a wide variety of styles. They are designed by the manufacturer for each specific building. Timber trusses also are built in a variety of styles using wood or metal joints.

3. Timber roof truss - Wikipedia

   en.wikipedia.org/wiki/Timber_roof_truss

   Two king post trusses linked to support a roof. Key:1: ridge beam, 2: purlins, 3: common rafters. This is an example of a "double roof" with principal rafters and common rafters. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof.

4. Main Street Bridge (Columbus, Ohio) - Wikipedia

   en.wikipedia.org/wiki/Main_Street_Bridge...

   When the former bridge closed, engineers estimated that a replacement would cost approximately $19.5 million. However, by 2004, estimates climbed $29.5 million. When planners received construction bids in 2006, the lowest was $44.1 million. Cost overruns, design changes and inspections added another $10 million to the structure's final cost. [6]

5. Hammerbeam roof - Wikipedia

   en.wikipedia.org/wiki/Hammerbeam_roof

   A hammer-beam is a form of timber roof truss, allowing a hammerbeam roof to span greater than the length of any individual piece of timber.In place of a normal tie beam spanning the entire width of the roof, short beams – the hammer beams – are supported by curved braces from the wall, and hammer posts or arch-braces are built on top to support the rafters and typically a collar beam.

6. Staggered truss system - Wikipedia

   en.wikipedia.org/wiki/Staggered_truss_system

   The staggered truss structural system consists of story-high steel trusses placed on alternating column lines on each floor so that the long axis of one truss is always between the trusses on the floor below. [4] The system staggers trusses on a 12’ module, meaning that on any given floor the trusses were 24’ apart. [2]

7. Lumber - Wikipedia

   en.wikipedia.org/wiki/Lumber

   C30, prefab roof trusses and where design requires somewhat stronger joists than C24 can offer. TR26 is also a common trussed rafter strength class in long standing use in the UK. [25] [26] C40, usually seen in glulam