No DPM in shed concreate base. Problem?

ScallionAyter · 30-08-2019 06:21PM #1

i'm not sure if there's a DPM in the concrete base of our shed. The concrete base is 9 inches deep, with rebar mesh.

Would a shed base without DPM likely cause issues in future?

Gumbo · 30-08-2019 07:28PM

ScallionAyter wrote: »

i'm not sure if there's a DPM in the concrete base of our shed. The concrete base is 9 inches deep, with rebar mesh.

Would a shed base without DPM likely cause issues in future?

Block built shed?
Or is it a slab for placing a timber shed onto it?

ScallionAyter · 30-08-2019 09:54PM

kceire wrote: »

Block built shed?
Or is it a slab for placing a timber shed onto it?

Right now there's no shed - only the base had been poured. I intend to build a block shed on top of it though.

Xcellor · 30-08-2019 09:57PM

ScallionAyter wrote: »

Right now there's no shed - only the base had been poured. I intend to build a block shed on top of it though.

You could put one down and use timber floor above it. Should work the same.

ScallionAyter · 30-08-2019 09:59PM

Xcellor wrote: »

You could put one down and use timber floor above it. Should work the same.

I'm just wondering is it a problem if there is none. Would moisture permeate up through 9 inches of concrete?

Worse case scenario we could tank the floor and tile on top.

Lumen · 01-09-2019 07:56AM

Surely if you're building a block shed you can just put down DPM on the slab and lap up and over blocks to form a DPC? And then pour a floor or whatever depending on what loads you're having and what sort of threshold you're planning.

listermint · 01-09-2019 08:32AM

Just put one down. As stated above. Tanking is an awful mess. Hate he stuff terrible to work with and you've to work in lightning speed.

Not having one in the shed you'll regret

Gumbo · 01-09-2019 09:18AM

ScallionAyter wrote: »

Right now there's no shed - only the base had been poured. I intend to build a block shed on top of it though.

So the slab is the
Foundation?

What will the walls be bearing onto?

bfclancy · 01-09-2019 09:56AM

What's the shed to be used for is the pertinent question. If it's for a lawnmower and other such tools then no issue. I have same base on my shed. 6m by 6m. Block on flat walls and cladded roof. No dpc on slab. Bone dry, just used for bikes lawnmower timber etc

Ak84 · 01-09-2019 11:54AM

I would imagine any moisture will just evaporate into the air.
As long as the base is above ground I don't see any issue.
Damp proofing is to protect timber floors and carpets if I am not mistaken.

Lumen · 01-09-2019 08:49PM

Ak84 wrote: »

I would imagine any moisture will just evaporate into the air.
As long as the base is above ground I don't see any issue.
Damp proofing is to protect timber floors and carpets if I am not mistaken.

You can get mould on damp concrete, depending on ventilation. I have it in my unheated basement. It's pretty grim. The amount of ingress depends on ground conditions, drainage and height of slab compared to ground level.

No DPM in shed concreate base. Problem?

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