fizzy walls

[qube_TA]

Hi,

I've a problem on several walls where the salt in the brick comes through and causes the plaster the bubble & fall off.

Anyone recommend something that can seal it and stop it coming though?

[TooLateForAName]

You need to sort out whatever is causing the damp.

[qube_TA]

TooLateForAName said:

You need to sort out whatever is causing the damp.

It's not damp it's effervescence, walls are bone dry.

[b2hbm]

We had that problem from one of the existing house walls when we built an extension and even after everything had dried out it still came through and blew off the top layers & paint. In the end I stripped off all the plaster down to the brickwork and rendered it with mortar and an additive to stop dampness coming through. Can't recall what it was called but we bought it from Wickes on the advice of a local builder.

A bit drastic but nothing I could find would seal it otherwise.

[toomuchbeer]

You could try this

this tell you why it happens

[TooLateForAName]

qube_TA said:

TooLateForAName said:

You need to sort out whatever is causing the damp.

It's not damp it's effervescence, walls are bone dry.

If the walls were bone dry you wouldn't have any moisture to evaporate leaving salt deposits.

//pedant mode : efflorescence

[qube_TA]

TooLateForAName said:

qube_TA said:

TooLateForAName said:

You need to sort out whatever is causing the damp.

It's not damp it's effervescence, walls are bone dry.

If the walls were bone dry you wouldn't have any moisture to evaporate leaving salt deposits.

//pedant mode : efflorescence

But it's happening on internal walls upstairs, there's nothing that can cause it to be damp and it's only in small patches, if I go in the loft there's patches there too, looks like cotton wool.

[Steve_D]

qube_TA said:

TooLateForAName said:

qube_TA said:

TooLateForAName said:

You need to sort out whatever is causing the damp.

It's not damp it's effervescence, walls are bone dry.

If the walls were bone dry you wouldn't have any moisture to evaporate leaving salt deposits.

//pedant mode : efflorescence

But it's happening on internal walls upstairs, there's nothing that can cause it to be damp and it's only in small patches, if I go in the loft there's patches there too, looks like cotton wool.

Sounds like your wall ties are bridged.

Steve

[mycroft]

My understanding of this is that the walls are not damp , so there is nothing you can do to seal it .
The salts are not coming through or into the wall they are already present within the wall , the method with this type of problem is to keep cleaning the wall down but don't wash it , just wipe with a dry cloth and rub the surface down with fine sand paper . Any salts in the wall tend to act as a sponge and soak moister out of the atmosphere so expect it to get worse in wet close weather .
If the skimming separates from the base-coat you will just need to re-skim , carlite plasters tend to act worse in situations like this , renovating base-coats are designed to prevent this type of problem as they hold the salts back .
Hope that makes sense , I'm a builder my IT skills are cr@p .

[Wings]

It could be due to the type of plaster used on the walls. I have a similar problem with a rented property, and following inspection of the same, the only remedy is to hack off all the plaster, and re plaster using the correct type of plaster.

http://www.sustainablebuildingresource.co.uk/build...