Raised Beds using sleepers

Hello all,
I plan to make some wooden sleeper raised beds. Should I line them to help prolong the life of the wood?
If so, what should I use? Pond liner?
All the very best
Will
I plan to make some wooden sleeper raised beds. Should I line them to help prolong the life of the wood?
If so, what should I use? Pond liner?
All the very best

Will
"Time you enjoy wasting, is not wasted time." John Lennon.
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I had raised beds put in a few years ago using pressure treated sleepers.
I didn't use any lining as I thought anything plastic-like between the soil and the wood would trap moisture making it unable to 'breathe'.
5 years on and the sleepers still appear to be fine
Wisdom is not putting it in a fruit salad.
That makes sense actually, I think I will go with your suggestion, thanks Pete.
All the very best
Will
Much appreciated suggestions. I'm now thinking not to use a liner, but thanks.
Very interesting @nick615, looking at that now.
Thing is though, I'm looking to do something similar to this with seats. So it will need a lot of cutting and joining and not really sure if the plastic will do the trick here.
I really do appreciate the feedback folks.
Thanks
Will
My woodworking skills only developed to the stage of making a milk bottle holder at school 😁
Wisdom is not putting it in a fruit salad.
Ha ha ha, I get you man. Yup, remember though, this is an example of what I'd like, not actually what I have. So with that in mind, I still have a long way to go, and perhaps a few swear words in between....
Thanks mate, I had a look and it seems they have kits for differing lengths. But I'm not sure how easy it would be to go "off piste" so to speak with adding the seats I'm after.
Perhaps I can talk to them. Thanks for the info though.