I will be bolting a wooden gate post to an inverted T-piece of
galvanised steel, itself bolted via M12 stainless studwork to a lump
of concrete. The post top is braced in all directions - to a house
wall via a rigid cross-beam, to the ground either side by stainless
So the lump of concrete need be quite minimal re just providing
location. The inverted T-piece lifts the wood off floor level and also
permits easy removal/replacement if ever necessary.
A drain passes the post, diagonally about 6in at its closest point and
about 12in deep to the top (not the invert). It is a normal brown
glazed drain, I have just exposed the top edge to get location &
vector info, it is buried direct in clay (no 10mm pea gravel).
Am I right in recalling a rule on "foundations" if there is a drain
nearby you go below its invert level due to load spreading at a 45-
I was planning on a simple 6in thick slab. The gate hinges away from
the drain both when closed and fully open. Moving the gate would be
quite messy (scouring the walls of past messy painters for one thing).
The gate is wood 1.4m wide, 1.8m high, not 4in box steel.
- posted 9 years ago