Extending concrete fence post?

[Dementor]

Hi, Sorry this is a bit long, I have a very rotten palisade fence attached to arris rails on 3' high concrete posts. I want to replace the fence but make it 6' high panel or continuous feather edge. I thought to bolt 6' wooden posts to the concrete ones through the existing bolt holes, however that would mean that the fence would over hang a public footpath by 3" +. I am not sure that the concrete posts can be drilled the other way to fasten post to the side instead of the front as the concrete seems to have been cast with some largish pebbles in it and i don't know if the concrete will just break. Is anyone aware of any sort of clamp for fastening the wood to the concrete without drilling or can you suggest anything else. I don't really want to dig the concrete out if at all possible. Thanks.

[dig dug dan]

you need to buy some V notched wall plates, and bolt the through the post, so there is one either side. The arriss rails then attach to the v notch, and you can fetheredge it. There shoudl be holes going through for this, without having to clamp on the side. hope this makes sense? if not a photo would be good.

[Dementor]

Thanks Dan I think I get the idea. However the existing holes run at 90 degrees to the existing fence line and I want to raise the overall height by about 3' so how would I go about fastening a wooden post to it without protruding over the boundary? Will try and post a photo

[dig dug dan]

in that case you will need to either drill through the post (not ideal as it always blows a hole in the other side as the drill emerges) or fix using plugs.
But there is an easier way. I use something called thunderbolts. You basically drill a 6mm hole through the timber you are fixing and then into the concrete, and then you just screw the thunderbolt in. No need for a plug. it screws its own fixing as you go.
you will need whats called an sds drill to drill the post. If you have not got one, you can hire them.
The hire shop should supply you the right drill bit too.

[lutonlagerlout]

we use a similar fixing dan ,called simply masonry fixings
75,100,0r 150 mm long think they are 7mm hardened steel and you drill a 6.5mm hole
really, really, strong fixing.
need a picture really dermo
LLL

[michaelthegardener]

Me personally id just re do the whole lot are you sure the posts are solid enough anyway ?