Damp wall or condensation would you tile on it????

[Bubblecraft]

You defo can't tile if its damp. You'll need to find what's causing the problem & have that sorted first.

If its not riding damp, there could be several things causing it from leaking roof, loose or damaged soil pipe, guttering, cracked or blown Roughcast/pebbledash, subsidence cracks etc.

If you are positive it's not water ingression from another source, you could try a trickle vent on your window (if there is one), install weep cavity vents, tank walls with a bitumen waterproofer, strap & sheet with an insulated PB. Try a dehumidifier after installing vents first and see if it returns before sheeting.

Is there any heat source in the room?

 

[Bubblecraft]

If customer is looking for a quick fix & it is not ingress from another source, you could just strap it & sheet with a Marmox board & tile. I would only use an insulated board as dampness could still get to your tiles causing condensation on them, could cause adhesive to fail or worse, tiles crack if temperature gets bellow 0 degrees

 

[lukeb]

Thanks for all the replies.
There is no heater or radiator in the room as some of you asked.Its definitely not coming from the roof.Personally would go with Bubblecraft suggestion doggy pebble dash as is external wall.(but not a damp expert :smilewinkgrin: )
as for pictures there is nothing to show as has been painted recently but paint peeling off in places,and was told that black mold builds up over time.(that has been done few times)
Honestly do not know what to do as client is potential for more work in the future(+ just had his 10k bathroom tiled)so really do not want turn the job down or bodge things up......on the other side he is aware of wall being problematic and he want to go ahead with the tiling.................DECISIONS,DECISIONS????????????:mad2:

 

[White Room]

I'd be getting the paint off first, that could holding back some moisture....are the walls gypsum plaster or render.

 

[Aston]

if there's no sign of damp due to leaks, external water penetration, or no damp course etc etc then i would pretty much guarantee that the problem is due to 'cold bridging' this when you have cold spots on the wall and then warm air containing moisture penetrates the cold spots on the wall and you get condensation and over a period of time, black mould.

is the property quite old? is the area prone to things like steam or hot and cold situations? ie showers, cooking? washing?

the way to solve it is to get the right balance of cooling and heating so that it stops the condensation forming. so some form of radiator or heating supply will need to be on in order to warm the room when its cold and a ventilation system/vent to cool the room when its warm...its just simply controlling the room temperature.

once that's done, the condensation will be reduced and the build up will reduce too..we used to use warm water and bleach to remove the black mould but i am not sure whether that actually works in the long term. check out if there's any specialised mould removal solutions out there, i'm sure there is.

 

[eric149]

Hi to everybody 🙂 I am a tilers forum new member.Probably this is external" cold wall".Usually I do stick to wall like this insullated moisture resistant dry wall board, and later I can tile on it.But must be no leaks from outside,check gutter.

 

[lukeb]

Thanks for all the answers guys.:rolleyes5::rolleyes5::rolleyes5: