Support Structure:
It carries the weight of the roofing material (IBR, Qtiles, tiles, etc.) and transfers that load to the walls of the building.

Common Timber Components:

• Trusses: The triangular frames that give the roof its shape.

• Rafters: Sloping beams running from the top (ridge) to the sides (wall plate).

• Purlins: Horizontal timbers that roofing sheets are directly fixed onto.

• Battens: Narrow strips of timber used under tiles or certain roofing materials.

Material:
Usually made from treated pine or gum poles to prevent rot, insects, and moisture damage.

Why It Matters:

• Ensures the roof is stable and safe.

• Affects the cost of roofing—the heavier the roofing material, the more timber you need.

• A strong timber layout increases roof lifespan and reduces maintenance.

Lightweight vs Heavy Materials:

• Lightweight roofing (IBR, Qtiles): Needs less timber.

• Heavy roofing (concrete tiles): Needs more timber to support the weight.