Question about internal wall / insulation

[NonnyMouse1337]

Hello I am a first time buyer and have been hunting for properties for a while now.
I honestly have zero idea about property related stuff like renovations and repairs but I'm slowly picking up on information. I've read plenty of home reports so staring to get an idea of different houses and what's wrong with them and potential repairs needed.

But I have come across a home report with the following statement and I wanted to clarify what it means, hence posting here.

The internal walls have been plastered directly onto the masonry.

I'm guessing this means there currently isn't any insulation within the property?

Is it possible to insulate such internal walls? Cavity insulation? Take down the plasterboard during redecoration and insert insulation before doing it up again?

I've not come across the statement before so unsure if it's fairly easy to rectify as part of repairs or if it should ring alarm bells as it might be complicated to sort out.
Sorry if it's a very silly question!

You need to build a timber stud internally to support a mineral wool type insulation before placing new plasterboard on the studs.

step the stud away from the wall by a minimum 25mm to avoid acoustic flanking.

don’t use a rigid insulation like celotex - you need a wool type insulation to trap the sound waves.

Thanks a lot for the advice Paintlayer!

I would interpret it as meaning there's no plasterboard at the moment. There are different grades of plaster board (or there were) so you could look for the thicker ones - not sure if you'd want to remove the current plaster off the brick first. It may sound obvious but thicker plaster board will reduce the size of the room

@Paintlayer I have wool type insulation in my walls & it's crap. I've been thinking of removing all the plasterboard to have celotex fitted instead because it's much thicker. But my walls do not connect to another property so I presume acoustic flanking isn't an issue?

Celotex is great for thermal performance so expect to see an improvement for your external walls. Acoustic insulation needs to be open celled (so the wool) to trap sounds waves which are only really an issue through your party wall. Unless you want to reduce traffic / airport / noise from outside.

Flanking is where sounds literally travels through the solid elements of the construction - if you can offset studs / decouple solid structures that will help stop sounds travelling

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I have no idea how I posted that here - apologies, I blame my phone.

Surely this is normal construction in any house built before plasterboard was invented? It's certainly the state of affairs in my 1900 semi and was also in the 1920s house I lived in before.
Remember if you add internal insulation to rooms, you lose floor area. Big rooms don't matter so much but smaller ones can make a big difference.

@Paintlayer Thanks for this info. We're going to have to do this soon with a party wall as the sound leakage is horrendous.

Ours and the neighbour's house used to be one and I assume the doorway was very shoddily bricked up. Putting in a stud wall filled with acoustic insulation is all we can think of to do. It means taking down the lath and plaster wall though so we can see the state of the party wall first.