After lots of useful replies about a gravel path I thought I would ask
some questions about another project I have been "thinking" of doing
for some time. I say "thinking" as I haven't done anything like this
before and what I have read various sites either conflicts or leaves
For information the wooden cabin is approx 13' x 15' and I am told in
total weighs approx 3 tonnes. I have also been told by the building
supplier the concrete base needs to be a 6" subbase (hardcore?) and 6"
concrete due to the weight of the building. I have got as far as
clearing the grass from the area and digging to the necessary depth for
the base so that the base is just above ground level. I was intending
on putting gravel around the outside of the building to prevent water
splashing up onto the cabin.
On a friends suggestion I also have begun to collect a small amount of
hardcore consisting mainly of house bricks. Although this may prove to
be a waste of time and effort!
These leaves me the following questions?
1. From reading various sites it seems that although the traditional
hardcore (Bricks, broken concrete) is cheaper than specific sub grade
material e.g. DTp1. It is considerably more work as it needs to be
broken down small enough, doesn't compact as well and obviously needs
collecting. The ideal subbase seems to be DTp1 compacted with a whacker
plate but will be expensive.
Is DTp1 overkill for this type of base or is there another material
other than traditional hardcore that would be suitable?
2. I don't seem to be able to see a definitive anwser on whether a base
this size and loading will need steel re-enforcing mesh to prevent
3. As access to the site is through the house I was considering having
the concrete pumped through the house. I realise that this will cost
more but will reduce the amount of work mixing the concrete and will
mean it is more consistent i.e. not mixing in slightly varying
quantities (also bearing in mind my experience in mixing concrete!).
4. Is it recommended to put a membrane material between the sub grade
and the concrete? I read that this will stop water permeating from the
ground up and prevent the sulphates in the subbase attacking the
I have researched this a fair amount on web and in books but anwsers or
hints on the best way to build this base would be appreciated.