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Posted: Tue Apr 04, 2006 7:15 pm
by slovak
Hello everyone,
I am trying to build a step of 1 metre radius. What I need to know is how many large radial key kerbs do I need? I worked out by working the circumference out and then devided by 2. I worked out I need 32 however when I layed them to see what it would look like, the actual radius is too small. please help! do I need more blocks or am I laying them wrong!
PLEASE HELP! 
Posted: Wed Apr 05, 2006 5:40 pm
by Tony McC
Did you think to ask the BM or Marshalls?
An arc formed entitrely of the radial units has a radius of approximately 485mm, call it half a metre. You'd think Marshalls would make this info readily available, but no sign of it in their Garden/Driveway brochure, and none on the incredibly overfussy and confusing new Marshalls Residential Paving website (a triumph of gimmickry over content, if ever there was!). I just happen to know because that's the sort of sad bugger I am.
So, for a 1 metre radius, you could alternate radial units with standard units. This strategy actually gives an arc of around 940mm radius, but if you use mortared joints, it can easily be adapted to form a true 1 metre radius arc. In fact, if you don't mind slightly gaping joints, you can butt-joint and achieve a 1m rad.
Using this strategy, you'd need 30 radial kerbs and 30 standard kerbs to create a circle of 1m radius, so 15 of each will give you a semi-circle.
Incidentally, thanks ever so much for sending the same Q by email. I just love it when people ignore the instructions on the Query page and decide that as their question is so important, I really need to be bombarded with it. 
Posted: Wed Apr 05, 2006 6:42 pm
by slovak
Thanks Tony for your help. I actually bought 30radial kerbs. They are not down yet so I will exchange 15 of them for the standard kerbs.
PS I am sorry about e-mailing you but I guess I was desperate. Soz.
humble lady in destress! 
