kellan_the_tabby

From:

Lots of timber rafters, heavy waterproof membrane [technically, it's an industrial grade tarp] and then sheet metal. Like 7 square meters of it.. [12 sheets of 125cm by 45cm] And probably a bucket load of bitumen based waterproof sealant/adhesive compound to seal the joints.

Possibly overkill, but I am sick of leaks.

Btw... if you're still working on your roof, might I suggest either overlapping the joints between the plywood sheets, or applying a waterproofing tape [or hemp sacking strips and cold application bitumen paint] to seal the joints between plywood sheets before you apply the waterproofing membrane over it. Not to stop the water coming in although it will do that, but to stop warm moist air from inside the wagon seeping up through the joints and condensing out under the membrane, forming a trapped layer of damp which would promote mold and rot.

Yeah, I've been researching roofing, having cocked up the first time.