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
Damp proof membrane under timber frame
- Thread starter Szakiyah
- Start date
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?
Damp will eventually seep through but my shed has been up 5 years so far without problems. No membrane.
It’s designed to drain effectively .
Amazing! Thanks
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?
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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.
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.
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