I have a concrete drive on the front of my house which currently has on
each side grass and plant borders. When getting in and out of the car
when it's raining the grass has been getting waterlogged and the mud
then walks into the house.
I was intending on bordering the plant beds with log roll edging and
then filling the areas next to the concrete drive with 30-40mm deep of
6-10mm gravel laid on a plastic membrane. I have read that gravel paths
used for foot traffic should have a sub layer of a 75-100mm layer of
crushed stone, hardcore or DTp1 in addition to the plastic membrane
under the gravel. Is this sub base necessary for this area considering
it will receive very little foot traffic (getting in and out of car
basically) or would just the plastic membrane be sufficent?
Any suggestions would be appreciated.
If you have soil under the gravel - think what effects a wandering mole
could produce, passing under the membrane.
Of course, if you have shallow topsoil with firm subsoil and there is no
possibility of moles, then a base for the gravel isn't necessary.
IME, with relatively shallow gravel, a membrane will last longer with an
inch or so of sand over it, rolled/treaded down, before putting the
gravel over the top.
My first thoughts are that the plastic will hold water and you'll be walking
through a pond with gravel in it. I think I would not put the plastic in
(what's it for, anyway?) but ensure that there was a good substructure to
avoid mud punching through. There is actually proper stuff for this called
Terram. You put this down first, but it's not cheap, although you probably
won't need much.
Thanks for the replies. Apologies, I didn't make it clear, I was
thinking of using a semi-permeable membrane between the gravel and the
earth to keep the gravel separate from the earth and possibly prevent
some weeds, although I realise this will not be 100%. I bought some
material similar to the Terram from B&Qs recently as it was on sale and
very cheap. I'll check to see if this is the same spec as the Terram
material mentioned here.
and how solid the subsoil is. If it the topsoil is thin and the
subsoil firm then I should be able to use a material like Terram under
the gravel. If this isn't the case then I'll need to use some sort of
larger aggregate underneath the top level of gravel.
This does raise a couple more questions:
1. If I need to use a larger aggregate under the gravel would this be
something like the DTp1 (as suggested by www.pavingexpert.com website)?
2. Would I need something like Terram between the two layers to stop
them mixing? Or is this the reason the under layer needs compacting?
Thanks again for advice.
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