Skip to main content

Ready to hire?

Post your job in minutes, browse real reviews and choose who to speak to.Post a job

Need some tips or advice?

Ask a question
Damp Proofing

Laying slabs 600x600.Does DPM polythene go on top of slabs or below and if below where. Thanks

Anonymous user 09/03/2024 - 3.20 PM

Putting a summerhouse in garden. Been advised to put down slab area for summerhouse. So using slabs 600 x 600. Simmer house 12ft x 10ft. Advised to have a 2inch overhang for summerhouse. My question to prevent damp at what point do I put DPM down on top of slabs or under slabs if under at what point. Thank you

Are you a tradesperson and able to answer this question?

Log in

3 Answers

Anonymous user

I'd advise having a concrete pad. Better for stability with a good foundation. Better for insulation as well. Hope this helps
Answered24 February 2021
2

Anonymous user

It depends on what sub base you’re having, usually you would lay your DPM before your concrete base.
Answered25 February 2021
0

A. Rose, Gardner

Rating: 5 out of 5
Lymington
HI Brian, You want at least 100mm of 20mm concrete or ready-mix. They sell ready-mix by the cubic meter so you'll need apporxinately (3 x 3.6 x 0 1m). Your DPC should go at the bottom of the pad; it stops the pad sinking and prevents the concrete drying out too quickly when you're tamping it. If you do opt for slabs, as long as your sub-base is good (again, 100mm of MOT), I wouldn't worry about a DPM. Your summerhouse should be on bearers which allows air flow and prevents any damp. All the best Dan
Answered25 February 2021
0