Plastic OSB or similar?

[StreetDragster]

Hi all
I'm putting a large plastic shed down on a large section of paving slabs, raised on plastic grids as the paving does sometimes have a bit of standing water.

The design of the shed needs a flat base so i need to put down something like OSB or ply on to of the grids, but also due to the design of the shed i think the edges of the wood will be exposed. Whereas a wood shed usually has the side panelling going past the floor level, protecting the edge of the base.

I was thinking that recycled plastic boards would be a thing now and be cheap, but i can't find anything reasonably priced. I've got 15msq to cover in hopefully some thing 15-18mm thick. I'm in the NW btw.

Any ideas of a cost effective plastic solution?

My current thinking is a sheet of visqueen down, osb3, then the edges of the visqueen turned over to wrap the boards, glued and stapled down. Won't be condensation proof mind.

Thanks

[J6542]

Level the grids and put the shed directly onto them, that’s what I was planning to do when looking at Keter sheds earlier in the year.

[T1547]

Fibre cement board like No More Ply?

[Simpo Two]

How about plastic/composite decking?

[StreetDragster]

J6542 said:

Level the grids and put the shed directly onto them, that s what I was planning to do when looking at Keter sheds earlier in the year.

I dont think the floor is strong enough for that. It's a quite thin plastic material that is mainly there to position the walls. I doubt it would take much weight before deforming.

Composite decking, and garage floor tiles were the first thoughts i had, but they are really expensive.
Never used cement board, I'll look into that thanks

[Pheo]

Not really designed for what you are using it for.

If you can’t level the grids then build a base from treated 2x4 and OSB over the top. 400mm centres.

[kambites]

Depending on exactly what you mean by "plastic grids", how about filling the grids with compacted pea shingle?

In my experience, OSB used anywhere it will get damp will ultimately rot, however well you treat it. You could create a sandwich with layers of fibre-glass on both sides of something like OSB (which is basically the construction of most small yachts) but it would be quite a lot of labour. Marine ply would last pretty well, but it's not cheap.

Edited by kambites on Monday 1st December 21:59

[beambeam1]

kambites said:

Depending on exactly what you mean by "plastic grids", how about filling the grids with compacted pea shingle?

This is what I would do. I installed one of the plastic Keter jobs last year and while perfect for the space and what it stores I have noticed a small split in the floor. It sits on concrete slabs so I can only imagine things like treading on loose bolts or a dropped screwdriver would easily pierce it too.

[sherman]

beambeam1 said:

kambites said:

Depending on exactly what you mean by "plastic grids", how about filling the grids with compacted pea shingle?

This is what I would do. I installed one of the plastic Keter jobs last year and while perfect for the space and what it stores I have noticed a small split in the floor. It sits on concrete slabs so I can only imagine things like treading on loose bolts or a dropped screwdriver would easily pierce it too.

This but fill the grids with compacted Whin dust as it will still drain but wont move

[megaphone]

How about putting a layer of ply/osb inside, on top of the plastic floor? ½" will be enough. It will be a better surface for inside a shed, less likely to get damaged, less slippy.

Edited by megaphone on Tuesday 2nd December 06:09

Edited by megaphone on Tuesday 2nd December 06:10

[StreetDragster]

Thanks for all replies.

I think we have a winner, i'm going to do as suggested and fill the grids with stuff after they have been leveled on shims and secured down.
I haven't found Whin dust locally, but Travis Perkins to do 10mm gravel and shingle and i think it'll do the same job.

https://www.travisperkins.co.uk/bagged-aggregates/...

Then, i'll put down OSB3 on the inside. I'm doing the walls anyway (effectively 'ply lining' it like you would in a van, but with OSB) so that i can hang stuff easily on the walls, lights, shadow board etc. A few more boards should allow the floor to be done too and i agree, it'll wear much better.
Might even put down tongue and groove chipboard for a much stronger floor with no raised edges.

Thanks all

[sherman]

StreetDragster said:

Thanks for all replies.

I think we have a winner, i'm going to do as suggested and fill the grids with stuff after they have been leveled on shims and secured down.
I haven't found Whin dust locally, but Travis Perkins to do 10mm gravel and shingle and i think it'll do the same job.

https://www.travisperkins.co.uk/bagged-aggregates/...

Then, i'll put down OSB3 on the inside. I'm doing the walls anyway (effectively 'ply lining' it like you would in a van, but with OSB) so that i can hang stuff easily on the walls, lights, shadow board etc. A few more boards should allow the floor to be done too and i agree, it'll wear much better.
Might even put down tongue and groove chipboard for a much stronger floor with no raised edges.

Thanks all

This is essentially the same as Whin dust.

https://www.travisperkins.co.uk/bagged-aggregates/...

Whin dust is ground Whinstone dust
Grano dust is ground Granite dust.

It may just be a case of what rock is available locally to you.

[StreetDragster]

Perfect, thank you