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Here's a video about this method. http://www.youtube.com/watch?v=9A8i6mouohw
I stopped using it a while ago, I care about my customers and myself.
when you dig up the lump of concrete you generally end up with a much bigger hole and you might have to use a lot more concrete as ...
this is a way to re-use the concrete foundation
The spacers will keep a uniform gap between the post and the bag
the socket bag is specifically designed for the purpose of fitting a 100x100mm (4"x4") section fence post. The bag is fairly robust and 900mm (3ft) long to cover ...
fill the gap with dry sand and pat while doing it to create a grip between the socket and the post
the material used is off cuts of insulation pipes, this is to separate the silicon from the dry sand
seal the top with silicon to keep the water out.
insert the post into the ground and concrete it in.
to extract the post, cut the silicon seal and suck the sand out with a vacuum cleaner
now you have a hollow foundation and can replace the post re-using the dry sand.
should you need to remove the concrete foundation completely due to ground movement or change of plans, it is still far easier to do so as the hollow fondation ...
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