Question

what size timber will be used for purlins?

select one:
a. studs
b. bearers
c. 90 x 90
d. 75 x 45

Explanation:

Locate the purlin specification

Using the Architectural Drawing Reading and Roof Framing Components knowledge points

Looking at the top right of the architectural drawing, there is a leader line pointing to the horizontal roof framing members. The text label clearly reads:
"\(75 \times 45\) purlins (flat)".

Match with the options

Using the Purlins and Rafters knowledge point

The question asks for the size of the timber used for the purlins. Comparing the identified label of \(75 \times 45\) with the multiple-choice options:

• Option a: Studs (incorrect, this is a framing member type)
• Option b: Bearers (incorrect, this is a subfloor framing member type)
• Option c: \(90 \times 90\) (incorrect, this is the size of the living/hall window lintel)
• Option d: \(75 \times 45\) (correct, matches the label)

Answer:

• a. Studs
• b. Bearers
• c. \(90 \times 90\)
• d. \(75 \times 45\) (Correct answer)