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I'd be worried about the sleepers producing 'slippery' steps
Are you creating a retaining wall, are the sleepers 'new', if so you need to consider additional preservative measures, as they won't last
And maybe get something to attach to steps as grip
I'm not a landscaper, so this may completely dumb...
A few year ago at home, I painted some wooden decking with steps with a yacht decking paint and the merchant added some anti slip sand to it. Works a treat.
Could you do the same with a preservative?
Just needs something to stop it being just wood!
Depends on the soil, sandy, clay, loam. Are you using the steps as a retainer or steps up a slope.
What's the drainage like. How high are your steps going.
lots of variables
Yes you can use concrete, but how will you fix the sleepers to the concrete
i have done this previously and I just set in 4x4 posts using postmix then a 150mm coachbolt straight through the sleeper into the post, it will take some force to get it to move
we use them a hell of a lot. if its a simple wall with no weight bearing and only a couple of feet high, then we tend to bed on some mot as its more free draining then soil and concrete first course in, nice and level and posts in behind, concreted in and sleeepers fixed to posts and each other. if its a bigger wall we use sleepers set vertically behind. dependent on the soil conditions we give the back a coat of liquid dpm. always overlap the sleepers. see so many where they are the butt joins follow up the wall. weak and it looks horrible