Be careful not to get sleepers that have been dunked in tar and creosote if you plan to sit on your wall or grow vegetables behind it or will have little kids climbing on it. Get the tantalised ones for preference.
Good advice Helix, that was another concern when it came to the old sleepers to.
If you can afford it, better to get oak ones that haven't been treated at all. Who knows when they'll be banning tanalised timber!
In direct contact with soil they're probably going to last about as long as a fence post, unless of course they were made from acoya timber but the cost would be prohibitive I imagine
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Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.