EPDM Roofing on Prefab Concrete Garage - How thick ply??

[gh1975]

Hi all.

Seeing as I cant afford a nice new garage, I have decided to revamp the concrete pebbledash leaky asbestos roofed garage I already have....

I have done some trawling around this forum and the internet and have decided that EPDM is the way to go, in place of the asbestos.

So just a few questions...
1. How thick does my ply base have to be?? The garage is 3m x 5.5m.
2. How often should i fit a support bar or purlin? At the moment i think they are at about 1.2m centres but thats only to support the lightweight Asbestos.

If anyone has any advice having done a similar job then i would appreciate any pointers...

Once i have it water tight then i'll fit a new window and render the pebble dash before one of my kids grinds a facial feature off!!

 

[DAZB]

I would fit extra support in between the existing so they are at 600mm centres and a deck of mimimum 18mm WBP. Selco are usually pretty good for sheet materials and 25mm may be possible if the price isn't much more than the 18mm.

 

[gh1975]

Thanks DAZB,

I'll price up the materials based on your recommendations.

Cheers