(Darragh) wrote in message . com...
Hi,

I'm planning to lay a patio in the summer, laying flagstones on sand
over an existing concreted surface. However, I'm also hoping to put
up 2 raised beds on either side of it (probably using railway sleepers
although I'm only 80% decided on that).

I was thinking I could break up that part of the existing concrete
that will be directly under the beds, and put topsoil on top of that
(I plan to have the beds about 2 foot tall or so). But I was just
wondering if this would provide enough (or too much) drainage?

I live in Dublin so rain isn't unknown, but I've never had a raised
bed before and am told drainage can be a problem.

Also I've heard conflicting stories about railway sleepers
(particularly whether they are too toxic and contaminate soil). Is
there a treatment that ensure they are OK (or should I just line the
inside of the bed with something if I use them?)

Thanks for any advice,

Darragh

Hello Darragh,
You might want to look at this site.

http://muextension.missouri.edu/expl...ort/g06985.htm

Hope this helps,
John.