I am a roofer and specialize in roof construction and repair
oh cool. what can you tell me about roofing? i know nothing about it
Mainly a roofer concentrates on applying waterproof and weatherproof materials to the roof
ohh okay.  how long doing roofing take on average?
depends on house size but to roof you have to have basic carpentry skills and decent motor skillls
i see. what else can you tell me about roofing? 
Materials used to roof vary by  region and can include shingles and tiles as well as concrete tiles