Encapsulating and damp proofing existing floor

[Andytnoidea]

Hi there I have a maisonette apparently built between 1950 to 1966 there seems to be damp coming through the floor and soaking the underlay there is a possibility it's condensation due to extremely high relative humidity and have some mould coming up in the bed frame and skirtings the floor is solid black rubbery texture and apparently on concrete base according to survey assume it is ashphalt/bitchumin but no real idea was wondering who could help if this contains asbestos and what is the cheapest way to encapsulate it and damp proof it an idiots guide with types of products to use would be a great help if any one can would be greatly appreciated

 

[JohnD]

Find the source of the leak and repair it.

Might be an underground water pipe, might be a radiator pipe.

Is every room in the house equally wet?

Or is it, for example, near the bathroom or kitchen?

 

[Andytnoidea]

Rad pipes are above ground and not leaking no pipework under the ground it's in bedroom near bathroom but only water in 1 spot corner of room no other rooms seem wet

 

[JohnD]

no pipework under the ground

Not even the water supply pipe?

"near bathroom"

Fancy that. Does the bath leak?

"no other rooms seem wet"

Almost as if the water was coming from one particular source.

 

[Andytnoidea]

Very odd the bathroom has a shower room only all water pipes lead out of back of maisonette into back garden and bedroom on other side of building rads not leaking so can only see that it's coming through concrete up through bitchumin or it's a cold spot where condensation forming

 

[JohnD]

Can you draw a floor plan?

No reason for condensation to behave like that.

Where is the stopcock for your incoming supply?

Where does the hot water come from?

Include them on your plan.

Also drainpipes, soilpipes and chimneybreasts.

 

[Koolpc]

Is shower on other side of that wall?

Could be the waste has been / is leaking...

 

[Andytnoidea]

 

[JohnD]

In those positions, look at the gutters and downpipes, and signs of dripping or splashing. Is the external wall wet? Photos would help. Can you find the DPC? How high is it compared to ground level?