New owner getting henhouse ready - need help on roofing please

Hi there, I am waiting for my hen house to be delivered but we have bought one with a damaged roof.  I have been reading that felt roofs are not ideal so I was wondering what else to use.  The coop is raised off the ground and opens into a run.  The whole roof covers the sleeping and run area continuously and the roof is an apex design 9ft long.  I have been down to my local B&Q and had a look at the shed roofing on offer and wondered if it is safe to use Bituminous Coroline?  I have seen Onduline recommended and is that the brand name for what I've been looing at?  Also, is it OK to fix those sheets to the gables without any other covering at all?  As it's corrugated that will mean that there are small spaces all the way round the top of the sleeping area where the roofing doesn't continuously meet the wood.  Is that good for ventilation or bad because it will be draughty, does that matter if it's over the chickens' heads?  Also does anyone know what you put on the top of the apex where the sheets meets so that the water doesn't get in beween the sheets, are there special section you can buy?  Hope someone can help, many thanks.  Wendy  P.S. Also great would be some tips on what is essential to buy for my chickens to begin with, I plan to have 3, a Blue Marans, a Light Sussex and a Rhode Island Light Sussex Cross.

Hello H H
welcome to the forum  .  Don't need to add anything to Joyfull's advice; just wanted to say good luck!  Keep us posted.

Hi there, thanks for your replies.  Can you tell me what's the best way to try & pro-actively avoid the red mites....is there a regime anyone follows that seems to work such as dusting or spraying the chooks and bedding/coop at certain intervals or cleaning the whole thing out once a week or something.  Is there a product that seems to work best?  Sorry, there will be lots of questions forthcoming!!!   Also could someone explain how to post a photo please?  Hopefully the coop with damaged roof will turn out to be a bargain it was a couple of hundred quid including delivery and is tall enough to walk into, will post some pics of it and it's new occupants when we are up and running and I find out how to do it.  I would love to have them walking around loose but we have a German Wirehaired Pointer who is partial to killing and eating anything that moves in our garden except for out ancient westie!

another thing you need to get is a vet that will treat chickens. Ring around all the vets in your area to check who is used to them 

Many on here use Easibed on the run floor as its said to be better than bark chippings. I haven't tried it yet but intend to over the winter. It can generally be bought from horse feed suppliers.