how deep are you supposed to dig when putting up concrete post's for a garden fence?

Question

I want to put up fence panels which are 6ft X 6ft with a gravel board on the bottom what is the lenth of concrete post i need to get?

Answer 1

depends on the size of the post,
4ft post sink it in about 1and a half ft
6ft post needs a mimimmum of 2ft in concreate

longer posts need more,... but remember to leave enough above to attach the fence if in doubt dig a depper hole and use more concreate to hold it in place

Answer 2

Installing Concrete Fence Posts

Answer 3

well I hear all these different measurements, I build a 6 fr fence and only went down 18" and 1 bag ready mix concrete and my fence is still solid as the day I build it and its been 7 yrs, Ps I think the majority is going a foot too deep

Answer 4

Down 18 inches use quick dry concrete to bed post.

Answer 5

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Answer 6

It depends on the height of the post !

About one third of the post needs to be under the ground.
So for a 6' post, order an 8' post and put 2' under the ground and 6' above ground.

Answer 7

two foot, then fill in with dry mix of sand,stone and cement,pack it down nice,level post then trickle some water over.you can then put gravel board in place and continue installing posts/fence panels without waiting for wet concrete to dry and posts will be solid. trust me i used this method after being advised and completed fence in one day. (with a little help!! )

Answer 8

Right, to start with Mighty Mouse is talking about wooden posts so forget that, you are talking about concrete posts, the sort that you can slide panels up and down i should think, get 9ft posts and you will be fine. 20" to 24" in the ground.

Answer 9

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Answer 10

I have done this many times and I can tell you now that the requirement is for one third of the length of the post to be in the ground. Whether you auger a smaller hole and drive the post into the earth, or dig a huge crumbly hole and fill it with concrete it is the same (the former is preferable, sometimes ground conditions force the latter). And I agree completely with the comment above that you can't specify a depth without knowing the height of this guys fence.

If you follow this rule your posts will rust out in due course (20 yrs etc). If you don't, they could/may become wobbly and need replacing prematurely. Obviously, the post will need to be thicker the taller it is and depending on the type of fence you wish to put up, and this should be a separate consideration. For a six foot feather-edge or larchlap fence, you could get away with 9 ft 3 x3's but if you're going to the hassle anyway I would use 4x4's.

You may find that the occasional obstacle in the ground prevents one or two posts from reaching this depth, but go as deep as you can, and your fence will last.

Anything else is a sort of changing-rooms version of fencing, as endorsed by B&Q and the like who want you to replace fencing every few years.

Edit: with your gravel Board you want six and a half feet out of the ground so I would use a ten foot post. Dig as narrow a hole as you can ( hiring a cantilevered petrol auger is good idea if you have a lot of them). Be sure to work out your fixings as you don't really want to drill your concrete posts after.

P.P.S. use a 5' panel with gravel board to keep your fence below six feet and you'll have no planning issues to consider- 9' post