Question

question 1
1.1 in figure 1 (below) markings are shown that appear on any structural timber bought in south africa. name these markings by writing only the answer next to the question number (1.1.1 - 1.1.6) in the answer book.
1.2 name four types of reconstituted board that are used in construction.
1.3 state five disadvantages of utilising timber in construction.
question 2
2.1 briefly describe the following terms used in the metal industry:
2.1.1 heat conductivity
2.1.2 yield strength
2.1.3 malleability
2.2 there are various ways in which metal can be cut. name four methods of cutting metals in the construction industry.
2.3 what three factors would you consider when choosing the right metal for a job?

Explanation:

1.1.1 - The "S" likely stands for structural timber indication.
1.1.2 - The SABS logo represents the South African Bureau of Standards, indicating compliance.
1.1.3 - The number "5" could be a grade or class number for the timber.
1.1.4 - Part of the SABS logo details.
1.1.5 - "LOMATI" might be the species or brand name of the timber.
1.1.6 - "FJ" could be a further classification or mark.
1.2 - Four types of re - constituted boards in construction are particleboard, medium - density fiberboard (MDF), oriented strand board (OSB), and hardboard.
1.3 - Five disadvantages of using timber in construction: susceptibility to decay, vulnerability to insect attack, can be flammable, dimensional instability with changes in moisture, and limited availability of high - quality timber.
2.1.1 - Heat conductivity is the ability of a metal to transfer heat. Metals with high heat conductivity transfer heat quickly.
2.1.2 - Yield strength is the stress at which a metal begins to deform plastically. It indicates the point beyond which the metal will not return to its original shape.
2.1.3 - Malleability is the property of a metal that allows it to be hammered or rolled into thin sheets without breaking.
2.2 - Four methods of cutting metals in construction: oxy - fuel cutting, plasma cutting, band saw cutting, and circular saw cutting.
2.3 - Three factors when choosing the right metal for a job: strength requirements, corrosion resistance, and cost.

Answer:

1.1.1: Structural timber indication
1.1.2: SABS compliance logo
1.1.3: Grade or class number
1.1.4: SABS logo details
1.1.5: Species or brand name
1.1.6: Classification or mark
1.2: Particleboard, Medium - density fiberboard (MDF), Oriented strand board (OSB), Hardboard
1.3: Susceptibility to decay, Vulnerability to insect attack, Flammability, Dimensional instability, Limited availability of high - quality timber
2.1.1: Ability of a metal to transfer heat
2.1.2: Stress at which a metal begins to deform plastically
2.1.3: Property allowing metal to be hammered or rolled into thin sheets
2.2: Oxy - fuel cutting, Plasma cutting, Band saw cutting, Circular saw cutting
2.3: Strength requirements, Corrosion resistance, Cost