DIY Doctor UK DIY Forums

Hi all, going to replace my garage roof very soon. It needs to be cost effective and the garage stores 2 motorbikes and tools essentially and is in a secure location at the back of the house. All timber supports are there and I will be doing the job myself. But i can't decide on the following materials...

opaque perspex
metal
plastic coated metal
bitumen

Any advice greatly appreciated.

Steve