Is there such a thing as liquid DPM?

[nuzuki]

I did a slab around 6years ago with no DPM underneath. I have since built walls and a roof over this slab but have problems with moisture build up mainly due to the metal roof. I wondered if I could run some tanking slurry or liquid DPM (if it exists) over the top of the slab to prevent moisture getting through the slab. Its not a habitable building its just a shed/outbuilding. What are my options here?

Thanks for your help

 

[Tigercubrider]

They certainly exist, but I don't see what a metal roof has to do with rising damp.
Condensation from a metal roof will fall onto the floor
Ground water may come through concrete unless stopped by a barrier

 

[JohnD]

Aquaprufe and Synthaprufe.

It's possible to throw grit on the surface before it sets so that a screed or wearing layer of fine concrete will adhere. Without the weight of a screed or extra layer, water pressure can push it off.

There are some soak-in waterproofing treatments applied to concrete tunnels and the like but I have never seen then used.

 

[^woody^]

The Royal Navy used to swear by a certain liquid DPM for several centuries. I suspect it still exists.

 

[Nige F]

Oakum and tar ?

 

[nuzuki]

Thanks for the replies guys. I have some left over tanking slurry so shall put that on the floor and then see how it is before adding anything else like Aquaprufe.

 

[Doggit]

If you're going to do the floor to stop moisture coming up, then you'll need to think about a DPM in the walls, and then take the slurry up the walls to join the two.