Garden room cladding - a problem

[WillyNelson]

It appears I've screwed up my planning for the rear and side cladding of my garden room. I'd planned to use corrugated bitumen sheeting as they're cheap and low maintenance. The issue is the side walls need 2.1 to 2.2m coverage in height and the bitumen sheets only seen to come in 2.0m lengths.

I could add in a timber strip at the top, which would square off the drop on the roof and bridge the gap, but it'd need to be 150mm x 65mm to fill the gap height and match the thickness of the batten plus corrugation height of the sheets, which would be a lot of wood...!

Or I could use metal sheeting, which is more expensive and a lot more faff to fit.

Any suggestions...?

 

[WillyNelson]

Can't this stuff sit inside of itself like the metal roofing sheets? I guess it is a lot thicker so maybe not.

It's about 3mm I think, so I could lap two sheets to get the height. I'm just worried it'll look a bit... messy.

 

[WillyNelson]

I have it on the sides and back (low maintenance), the sides have a lapped section at the top and I never notice it. Front is clad vertically in timber.

This was exactly what I was going for as well. Having looked at it, the box corrugated steel might actually work out less expensive if I can find someone either local or with reasonable delivery fees.