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2. Timber roof truss - Wikipedia

   en.wikipedia.org/wiki/Timber_roof_truss

   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. Trusses usually occur at regular intervals, linked by longitudinal timbers such as purlins. The space between each truss is known ...

3. 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.

4. American historic carpentry - Wikipedia

   en.wikipedia.org/wiki/American_historic_carpentry

   Plank framed truss was the name for roof trusses made with planks rather than timber roof trusses. In the 20th century, it was typical for carpenters to make their own trusses by nailing planks together with wood plates at the joints. Today similar trusses are manufactured to engineering standards and use truss connector plates.

5. Purlin - Wikipedia

   en.wikipedia.org/wiki/Purlin

   A purlin (or historically purline, purloyne, purling, perling) is a longitudinal, horizontal, structural member in a roof. In traditional timber framing there are three basic types of purlin: purlin plate, principal purlin, and common purlin. Purlins also appear in steel frame construction. Steel purlins may be painted or greased for protection ...

6. Glued laminated timber - Wikipedia

   en.wikipedia.org/wiki/Glued_laminated_timber

   Glulam brace with plates used for connections Glulam frame of a roof structure. Glued laminated timber, commonly referred to as glulam, is a type of structural engineered wood product constituted by layers of dimensional lumber bonded together with durable, moisture-resistant structural adhesives so that all of the grain runs parallel to the longitudinal axis.

7. Fink truss - Wikipedia

   en.wikipedia.org/wiki/Fink_truss

   The first Fink Truss bridge was built by the Baltimore and Ohio Railroad in 1852 to span the Monongahela River at Fairmont, Virginia (now West Virginia). It consisted of three spans, each 205 feet long. It was the longest iron railroad bridge in the United States at the time. Several other Fink trusses held world records for their time ...