Low pitch roof with slate finish

[McNeill]

Looking for a bit of guidance here.
I'm trying to find a slate (or other product with natural slate appearance) to fit to a new lean to roof with an angle of only 12 degrees.
It's a planning stipulation that it's to be slate appearance but I've only found the Tapco slate which is suitable for 14 degrees at the lowest. Building Control will check the manufacturers technical brochure, so there's no point in exaggerating the information.
I'm stuck with the angle of 12 degrees, so any help would be much appreciated.

 

[noseall]

There are faux (inerlocking) slates available but none that i know of that will deal with 12 degrees.

Your best option is to thoroughly waterproof the roof at the sarking stage prior to tiling.

 

[^woody^]

Board and felt the roof as you would a flat roof, then batten and counter-batten for the slates.

You just need to pay more attention to the eaves detail to keep it looking "right", as otherwise it can look too deep and nasty

 

[catlad]

You could ask if they would accept a flat roof counter battened then slated.

 

[McNeill]

Thanks for the replies.
If I was to waterproof the roof prior to slates on battens and counterbattens, surely the fixing of the counterbattens through the waterproof layers to the OSB/sarking would defeat the purpose of a waterproof membrane?

 

[Alastairreid]

The roof is still watertight to a degree with only a minimal amount of water getting through the slates if any.

The counter battens are nailed at the trusses..the membrane is not compromised.

 

[catlad]

You can felt over the first batons once laid.