A roofer, roof mechanic, or roofing contractor is a tradesperson who specializes in roof construction.

Roof decking (also known as roof sheathing) is the wooden boards (plywood or planks) that make up the framing of your roof. It's the foundation of your entire roof system and what your roofing materials are installed on.

Roof covering: shingles, tile, slate or metal and underlayment that protect the sheathing from weather. Sheathing: boards or sheet material that are fastened to roof rafters to cover a house or building. Roof structure: rafters and trusses constructed to support the sheathing.

This is the part that holds up the roof from inside the building. We haven't included it, but the attic or loft is the space under the roof, which is formed and protected by both the internal and external structures.