Blown Plaster - 1930s Build Lime Plaster

Question

Blown Plaster in 1930s built property, is gypsum plaster compatible with lime and cement mixed plastered walls, plaster seems to be blown on external walls on isolated areas on one part of each external wall only, is this due to moisture affecting gypsum plaster used at some point in specific areas only, as the grey lime plastered areas are fine?

Keith · Accepted Answer

Yes, it will be damp coming from the outside wall. if you seal the wall first it will be ok

Duncan · Answer

There could be many reasons. Generally it is ok to use multi finish with lime as long as there are no under lying issues! 
Without inspecting the property it really is impossible to say. The fact there are areas of modern plaster on the walls suggest there has been a problem before? And if there has been issues before unless they are fixed problems will continue.
Has the property suffered with damp walls before? Has the property undergone damp injection? If so has it been done correctly? Are there issues outside with the wall that are causing water penetration? Sitting water, blocked or damaged drains?  Is there ventilation? Blocked cavities? Blocked air bricks?
All these points plus more can affect what is happening inside.
If there has been an issue and it hasn’t been addressed correctly, then by coating walls with modern plaster will trap the moisture and fail at some point.

Glen · Answer

The best option is to hack off bond and skim with modern browning or bonding or thistle multi

Karl · Answer

Applied correctly you will be fine, but I would advise that you have an experienced plasterer have a look at the wall before you possibly create a bigger (more costly) issue. They may just give you advice and tell you to crack on if the job is minor.

Plenty on here so good luck and I hope you get the issue sorted fast.

Blown Plaster - 1930s Build Lime Plaster

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