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2. 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 ...

3. Rafter - Wikipedia

   en.wikipedia.org/wiki/Rafter

   For longer span rafters, building materials manufacturers have created laminated veneer lumber (LVL) rafters that can be 2–5 times longer than typical wood rafter. In the US, most wood rafters have maximum length of 20 feet (6.1 m). If a longer rafter is needed, LVL is an alternative.

4. Timber roof truss - Wikipedia

   en.wikipedia.org/wiki/Timber_roof_truss

   Key: 1: principal rafters, 2: collar beam, 3: arch braces. Lacking a tie beam, [11] the arch-braced (arched brace) [12] truss gives a more open look to the interior of the roof. The principal rafters are linked by a collar beam supported by a pair of arch braces, which stiffen the structure and help to transmit the weight of the roof down ...

5. Flitch beam - Wikipedia

   en.wikipedia.org/wiki/Flitch_beam

   Flitch beam. A flitch beam (or flitched beam) is a compound beam used in the construction of houses, decks, and other primarily wood-frame structures. Typically, the flitch beam is made up of a vertical steel plate sandwiched between two wood beams, the three layers being held together with bolts. In that common form it is sometimes referenced ...

6. Roof pitch - Wikipedia

   en.wikipedia.org/wiki/Roof_pitch

   Greek: the ridge height is 1/9 to 1/7th the span (an angle of 12.5° to 16°); Roman: the ridge height is 2/9ths to 1/3 the span (an angle of 24° to 34°); Common: the rafter length is 3/4 the span (about 48°); Gothic: the rafters equal the span (60°); and; Elizabethan: the rafters are longer than the span (more than 60°).

7. Domestic roof construction - Wikipedia

   en.wikipedia.org/wiki/Domestic_roof_construction

   In the UK, a concrete tiled roof would normally have rafters at 600 mm (24 in) centers, roof battens at 300 mm (12 in) centers and ceiling joists at 400 mm (16 in) centers. The United States still uses imperial units of measurement and framing members are typically spaced sixteen or twenty-four inches apart.