Help with Shed Base

[HarperLewis]

I building a shed 3m x 1.4m for general garden storage (on slabs). I'm trying to work out how exactly the base should be. As I understand there is UC3 timber (not for ground contact) and UC4 (which is suitable for ground contact). I'm trying to work out what is the correct option:

1. Use UC4 timber for the base (I can only get this in 47mm x 150mm), then build the stud walls from with 2x4 or 2x3 UC3 timber (should this have a DPC between the UC4 and UC3 stud walls)?
2. Use UC3 timber and place the DPC between the timber and the slabs?
3. Something else?

 

[baldykev]

best way is to raise the floor of shed of the concrete floor by say 10mm on lengths of treated wood ,this will also give you good air flow under the floor of the shed

 

[HarperLewis]

You mean something like https://mytradeproducts.com/product...bearing-shims-70x70mm-select-size-2mm-to-20mm and use UC3 on top?

 

[Tigercubrider]

I don’t know if they are better, but there are posts made of recycled plastic that wouldn’t rot if used as a bearer for a shed?
Presumably they are UV stable

 

[Alec_t]

raise the floor of shed off the concrete floor by say 10mm on lengths of treated wood ,this will also give you good air flow under the floor of the shed

Be aware any resulting hollow under the shed floor makes an ideal nesting space for rats if they can gnaw rheir way in.

 

[HarperLewis]

Be aware any resulting hollow under the shed floor makes an ideal nesting space for rats if they can gnaw rheir way in.

Is there a good way to avoid this? (although given we have cats, they might find the living conditions unfavourably)

I'm guessing this would only be the case if we actually put a floor in rather then just leaving the slabs exposed (there currently spaced at 50mm spacing with gravel in between) so I may not bother with a floor at all or maybe just put some of these on the ground to lift anything on the floor off the ground

 

[Alec_t]

maybe just put some of these on the ground to lift anything on the floor off the ground

Those look a good idea. They should keep the shed timber clear of wet ground.