A 1m rise will give you a 22 degree pitch. However you could trim it down to as little as say 750mm and settle for a 17 degree pitch.
What are your constraints in terms of rise?
Thanks for the info , it's an external workshop, my only constraints to be honest are neighbours, I've not got planning permission, so need to stick to regulation which I read was max height of 2.5 metre ? is that correct ?
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