i'm planningon building a wooden workshop 21feet by 14 feet.on top of a
Can anyone give me any tips or pointers regarding the construction of the
base.ie how deep to dig how much hardcore to use, reinforcing etc etc.
It obviously depends on what you are going to put in it ( 2 ton vertical
mill perhaps?), the nature of the subsoil (hit rock 3" down?), whether
you want to use it all year round (underfloor insulation?), etc.
A starting point could be that typical for a garage, which is about 4"
compacted hardcore with 4" of concrete on top - maybe a bit thicker at
the edges . Adding mesh reinforcement if the subsoil is weak or if you
are particularly worried about the odd crack or two at some time in the
future. But that it going to be massive overkill if you are only using
it for dressmaking..
What you might wish to consider is to look at a few wooden buildings on
sale and find one similar to what you intend - then ask the manufacturer
what base it should have for the conditions and use you have in mind.
If by wooden workshop you mean a large garden shed, and you will not be
using it as a garage or for heavy machinery, then 3 to 4 inches of concrete
should be OK providing the ground underneath is solid. If the ground is soft
soil then that needs digging out to a depth of 3 to 4 inches for a hardcore
sub-base. This Homebase article gives advice on depth of concrete, hardcore
and construction methods:
Further advice at http://www.diydoctor.org.uk/projects/shedbase.htm
For a workshop/garage base requiring reinforcing see
As the floor area will exceed 15 square metres then you probably need
planning permission/building regs approval:
http://www.diydata.com/planning/planregperm/planning_rules.htm . If you
intend installing power then Part P (Electrical safety) will also apply.
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