Fixings for oak sleeper garden wall?

[GloriousEuropa]

Putting in retaining oak sleeper walls. They’ll be 200mm x 100mm sleepers laid on the 200mm face, so we need fixings that will go through the 100mm to the sleeper below.

Screwfix only has 100mm (so too short) or 150mm screws which will go halfway through the sleeper below. Is this okay?

And is it a correct assumption to put 4 x 2 fixings in 2.4m sleeper?

 

[Burnerman]

I wrote this a while ago.....it could help with some of your questions but of course all suggestions are welcome:
https://www.diynot.com/diy/threads/pressure-treated-wood-cupping.544605/
John

 

[Tigercubrider]

https://www.railwaysleepers.com/rai...eper-fixings/timberlok-railway-sleeper-screws

 

[GloriousEuropa]

Thanks guys.

I’ll consider both of them!