Consider the following statements regarding the classification of beams:
1. Floor beams are often referred to as girders.
2. Joist is a beam supporting floor construction but not a major beam.
3. Rafter is a roof beam, usually supported by roof truss.
Which of the above statements are correct?
1
1 and 2 only
2
1 and 3 only
3
2 and 3 only
4
1, 2 and 3