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My son has just bought himself a new shed and 8m roped in for assembly. It's going to be put into a patio which can be inclined to be damp .
I think racing the shed onto a base would be wise ..... What would be the thoughts of you guys ... Build a wooden base from pressure treated .... Or use bricks / blocks to raise off the damp patio ?
Try this...
http://www.a1sheds.com/blog/2016/03/05/shed-foundations-what-base-is-best/
I really like the idea of the plastic grid squares - last forever and plenty of airflow...
there must be loads of shed threads - has anyone bookmarked the better ones? bespoke builds preferably?
There's a few typos in your original message (auto-correct?), but I think you are saying that the patio its planned to be placed upon tends to have standing water on it, so you are thinking of raising the shed off the patio to prevent the damp affecting the shed?
If the patio isn't draining properly, it might be better to resolve this otherwise you'll still have puddles under the shed that are not going to disappear through evaporation etc so you'll still have a hidden source of potential damp. Could you add a drainage channel into the patio to fix this (see https://www.diy.com/ideas-advice/how-to-fit-a-paving-drainage-system/CC_npci_100144.art ) ?
If you are going to raise the shed floor slightly using additional slabs as pontoon-like structure you'll probably want to go for a stronger floor option as the basic floor options from most suppliers expect you to have a continuous flat structure underneath.
I came across these things the other week when I was looking at summerhouses:
Seems like a simple solution to the problem and cheaper than I was expecting.
Bit of a self publicist but I built this a while ago now (worked in it almost every days since Covid) Happy to help with any questions from my experience if I can
https://singletrackmag.com/forum/topic/help-constructing-my-summer-house-jib-hidden-door/
If the patio is sufficiently stable, but not good enough to use as the floor of the shed itself, i would be putting it on brick feet, for sure. Any airflow is going to be better than none, and i would keep all timbers lifted out of potential puddles.
https://www.wrekinconcreteproducts.co.uk/products/wrekin-concrete-products-decking-block/
4 or 6 of these, with a pressure treated frame to sit the floor on would be the luxury option?
Also, if its a kit shed, and the floor comes as a big panel ready made, i would get a tin of some form or preservative and liberaly douse/slather the underside with it before putting it down. Something you have to wear gloves for that is bad for you can only help resist fungal/mould damage?
Could you even Waxoyl it, or would that be silly?
Waxoyl is an interesting idea, although I do wonder if it wouldn’t seal moisture in, accelerating rot?
I've also been looking at shedboots, and adjustable decking feet as the best quick solution.