How did the builders fix this edging in?

[Ramekin]

We have an extension built recently and the builders put a path with gravel and edging around the outside. I'm intrigued by how they fixed the edging into the ground and want to copy it for some garden DIY, but I can't quite figure it out. I did ask them but don't quite get it.

Picture attached. I gather they drove some kind of long coach bolt/screw through into the ground, then I guess they ground off the head. I can't see any marks on the wood though so it was a neat job if so.

Anyone know/guess how they did this?

Thanks!

 

[johnny2007]

It's an expensive but permanent solution.
Buy M10 stainless steel threaded bars, cut them into 33cm pieces (3 per length), place a nut at the top and hammer it in the ground.
Depending on the ground this might be easy or near impossible.
To make it easier if the ground is too hard, drill an 8mm pilot hole with a long drill bit, then hammer the threaded bars in.
Put the wood resting on the pieces sticking out (10cm, less or more depending on wood size), mark the wood by gently tapping or with a pencil.
Drill 10mm holes to correct depth in the wood.
Use resin to fix everything in place.
Many years later you can reuse the same threaded bars and just replace the rotten wood.

 

[Ramekin]

Thanks, that sounds very plausible. I imagine whatever they used as bar they had to hand from the extension, but it would be eBay etc for me!

It's an expensive but permanent solution.
Buy M10 stainless steel threaded bars, cut them into 33cm pieces (3 per length), place a nut at the top and hammer it in the ground.
Depending on the ground this might be easy or near impossible.
To make it easier if the ground is too hard, drill an 8mm pilot hole with a long drill bit, then hammer the threaded bars in.
Put the wood resting on the pieces sticking out (10cm, less or more depending on wood size), mark the wood by gently tapping or with a pencil.
Drill 10mm holes to correct depth in the wood.
Use resin to fix everything in place.
Many years later you can reuse the same threaded bars and just replace the rotten wood.

 

[JohnD]

a builder is very likely to have some scrap rebar.

you can buy stainless studding on ebay cut to length.

 

[johnny2007]

Toolstation sells stainless steel threaded bars

https://www.toolstation.com/stainless-steel-threaded-bar/p79966

 

[JohnD]

good price, but

10 x 320mm lengths of M8 for £11.80 inc.

if you need that many

https://www.ebay.co.uk/itm/M4-M8-A2...VARIOUS-LENGTHS/112554192435?var=412951180082

 

[johnny2007]

good price, but

10 x 320mm lengths of M8 for £11.80 inc.

if you need that many

https://www.ebay.co.uk/itm/M4-M8-A2...VARIOUS-LENGTHS/112554192435?var=412951180082

I would be careful with ebay stainless steel.
Might just be iron and rust in a few days.

 

[Mottie]

They also sell it at B&Q.