Do I really need a DPM?

[ms2004]

Tomorrow, weather permitting, im laying a concrete slab for what will be a base for a summerhouse. I had ordered some DPM but it hasnt turned up and Im told the courier has lost it. We live in a very remote area so getting hold of some means I have to order online and wait for it. The issue is I have borrowed a friends cement mixer and he needs it back so I was wondering if i should lay the base without the DPM? Its about 2.4m x 4m square and I was going to put the summerhouse of pressure treated bearers anyway wrapped in DPC.

Any opinions on this would be appreciated. Thanks.

 

[Handymanjo]

Screwfix stock this on the shelf

 

[Nige F]

I was wondering if i should lay the base without the DPM? Its about 2.4m x 4m square and I was going to put the summerhouse of pressure treated bearers anyway wrapped in DPC.

.

Crack on - that will be plenty of damp proofing

 

[Himaginn]

I reckon, if you get it wrong, you could have rotten bearers in as little as 5 years.
It would be wise to check on your exact proposals, the problem you have is time.
But you can check on your proposals, on here, before you continue with your bearers.

 

[tony1851]

If you don't skimp on the cement content, and do the slab a reasonable thickness (min, 100) you should be fine.