Foundation thickness for freestanding garden wall pier

[SFK]

All,

I want a free standing pier that is 2 bricks wide by 2 bricks deep (ie 18inches by 18inches), And will be about 4 feet tall topped with a flat pier cap.

What thickness do I need the concrete foundations to be to support this?

With thanks, sfk

 

[Andyc84]

Without sounding stupid are you only wanting to build a column, or are you intending to do something with this, or attach anything to it.

Only ask as this will obviously affect the size of the base.

 

[SFK]

Dear Andy,
They are to be free standing columns on either side of house footpath.
So they might have a light garden gate on them.
sfk

 

[munchingB]

i would make a small concrete pile say 30cms deep fix some rebar running into the centre of the brick column-assuming it isnt soild and then fill the gap with concrete.

 

[themiddleagedun]

750x750x200mm on decent ground, say 900mm deep.

 

[SFK]

Dear Both,
With many thanks for your responses - and thinking of a mixture of your responses based on the ground I have).

So I think I will go for 600mm x 600mm (so it overhangs the piers by 75mm on each side) and 300mm thick at a starting depth of 600mm (as this is depth that ground is very stable).

And a couple of re-bar in this that stick up and out of the top to form the brick pier around.

With many thanks

sfk