Damp proof membrane under timber frame

[Szakiyah]

Mesh is far too big to stop mice , they only need 6-7mm hole.

I guess it’s just a preventative measure or getting ones with smaller squares, or keep the one he has and do two layers off centre. Think it’ll be good

 

[Old Salt]

I have 4x4 pressure treated under my shed but to keep the height down you could use 2x2 or 3x3. Lets air circulate, keeps the floor off the damp and if the bearers rot they can be replaced relatively easily.

 

[Szakiyah]

I have 4x4 pressure treated under my shed but to keep the height down you could use 2x2 or 3x3. Lets air circulate, keeps the floor off the damp and if the bearers rot they can be replaced relatively easily.

Hey that’s great do you have any photos you can show me? Im trying to get some ideas together and work within my own means. Will damp rise on pressure treated timber? Have you put membrane down too?

 

[Old Salt]

Damp will eventually seep through but my shed has been up 5 years so far without problems. No membrane.

 

[foxhole]

I think I prefer the bricks option, as the plastic base + gravel option seems as though it would still trap a bit of water and would leave things damper.

It’s designed to drain effectively .

 

[simplesteve]

Only as you were looking for photos/ideas …

 

[Szakiyah]

Only as you were looking for photos/ideas …

Amazing! Thanks

 

[Szakiyah]

Only as you were looking for photos/ideas …

At this point can i put the osb flooring down then start? I see yours has that gap with the bearers going across but as mine is on block paving and there will be a gap underneath the slabs can i just do that?

 

[simplesteve]

I don’t see why not; though I’ve sealed the gaps off between the slabs to stop mice getting under it, and having bearers on top of a frame means there will always be air circulating under it to help keep it dry.

 

[Szakiyah]

I might just add bearers underneath the frame on top of the slabs or keep it how it is, I’ll see if i can do it within my budget

 

[diy_fun_uk]

I’ve just finished ‘making’ my shed/summerhouse. After costing it up against making it myself, I went for the heaviest duty/ proper construction / T&G/ osb-free one I could find off the shelf…

Anyway, I made my base first, out of Pressure Treated 4 x 4’s, put on top of a concreted in slab/pad at every join which was levelled.

Worked a treat, but had to go back this morning and throw a handful of concrete between the slabs :- mice had moved in and we’re driving my dog nuts !
Tommorows job is nailing the rat mesh across the floor bearers….

This is essentially how I did a shed years back, levelled and compacted an area of soil, laid 4 rows of slabs, laid 4x4 posts on said rows, base of shed laid over the 4x4s, shed constructed. I didn't have any dpc between anything.

A decade later the shed was still perfectly dry, no damp. When it rained (and being in Scotland this was quite frequently!) yes water was absorbed by the 4x4s, however the shed base never seemed to be affected. I think what undoubtedly helped was the void under the base created by the 4x4s which aided airflow.