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PostPosted: Sat Jan 27, 2018 12:25 pm 
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Hi
I would like some advice. I want to put some wooden fence post in my garden. The above ground height will be 14 inches. What would be the depth of the hole I need to dig to cement them in? One post is 100x100 the rest are 75x75.
Many thanks in advance


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 Post subject: Re: Fence post height
PostPosted: Sat Jan 27, 2018 1:17 pm 
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14 inches isn't very high so I assume there won't be a great deal of wind pressure effecting them so the actual depth shouldn't really be that critical. In this instance I'd work it on stock sizes of timber. You should be able to get six foot posts and cut them in half , which gives you a treated end to put in the ground. Even at slightly less than cut in half will give you 18"+ in the ground which would be more than enough.
Going off slightly I probably wouldn't bother with concrete / postcrete with such a low fence , I'd simply ram the earth back around . I did that recently on a job with eight foot posts sunk a arms length in the ground and back filled and rammed just as solid as if I'd used concrete.


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 Post subject: Re: Fence post height
PostPosted: Sat Jan 27, 2018 5:42 pm 
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The posts are for a raised bed and the wood I am using is 47 mm thick by 300mm height. So I thought that I should cement the posts in because of the weight of the soil as a precaution. But still not sure of the depth to sink the posts.


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 Post subject: Re: Fence post height
PostPosted: Sat Jan 27, 2018 6:08 pm 
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I see. 18" should be more than good enough as I see it.
Just something to add is that at some point it will rot no matter how it's treated and on another forum I use someone was using short concrete posts and gravel boards , which are both strong and rot proof , to form raised beds. Just a thought if you haven't brought all the timber yet.


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PostPosted: Sat Jan 27, 2018 6:15 pm 
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:welcomeuhm: I've edited the title of your thread as this may make a difference to which of our regular members look in.


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PostPosted: Sat Jan 27, 2018 6:34 pm 
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moderator2 wrote:
:welcomeuhm: I've edited the title of your thread as this may make a difference to which of our regular members look in.
You could do as grendel suggested with concrete and face with timber to give you the finish you want. The wood will rot eventually if you just use that

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PostPosted: Sat Jan 27, 2018 8:31 pm 
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Thanks for the advice I am going to paint the wood with a Black Bituminous Paint and then use a Damp Proof Membrane between the wood and the soil. Just one more question what diameter should the post hole be?


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PostPosted: Sat Jan 27, 2018 9:03 pm 
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geezer_dave wrote:
Thanks for the advice I am going to paint the wood with a Black Bituminous Paint and then use a Damp Proof Membrane between the wood and the soil. Just one more question what diameter should the post hole be?
Not that much greater than the post.

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PostPosted: Sat Jan 27, 2018 10:37 pm 
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just a thought
is this a raised bed as in 1/2or3 sections with natural earth levels making up the other sides :dunno:
if its 4 sides interconnected in a box with an open base then ground penetration and support is needed far less as the box will be fairly neutral to the load
where as acting like a retaining wall without braceing need quite a lot off support

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PostPosted: Sat Jan 27, 2018 11:37 pm 
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The raised bed is going to be made of 2 150mm x 47mm running parallel to the fence line the front and side faces are made of stone. Hope that makes it clearer.

Thanks for imput


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