For extension roofing I have some questions.

1. Is it ok to use wood as the roof structure? How does it compare to iron structures?

2. Roof tiles, I see some people are using cement/conrete tiles where as some are using corrugated (orange colour) roof sheet? Which is better?

3. Is it necessary to install a gutter?

Thanks for the reply.

The contractor did mention that the alunimum will sag after a while and the recommended wood isntead.

I'm not sure if I understand you right, at the moment the contractor recommended using those big sheet of corrugated roof (huge rectangular pieces)instead of the cement tiles because he says that they will last longer, is that true. Tiles will then to crack / wear out after a while

What are they made of anyways, I hope it's not asbestos.

The extension is on the ground floor, contractor says that don't really need a gutter because there will be a slight overhang of the roof after hte door. Kinda undecided if I should get one installed.

What is the common practice anyways?

And any other things that they put between the ceiling and the roof to prevent intrusion and even to regulate temperature?

Any health hazards associated with asbestos roofing?

Ok thanks for all the replies, I have decided to use tiles.

What do you mean by having wood beams to make the roof inaccessible?