Reason for bowing walls

[Rob.Ita]

Hi, my house is 1950's concrete and is suffering some movement. I had a subsidence engineer over who says that's not the cause. My upper floor internal stud walls are bowing, if you run your hand over them, they go in and out. If you held a straight edge against the wall, there would be about a 5-7 mm gap seemingly at the timber stud locations. They weren't like this when i moved in years ago. Its really noticeable when you put a lamp against the wall.
Does anyone know reasons why this may be? Thanks, Robin.

 

[^woody^]

It's old?
It was built like that?

Its like most other old houses up and down the country?

 

[wessex101]

The fundamental question is what are the internal stud walls built from? If it is non-traditional construction house the internal partitions could be built from all sorts of weird and wonderful materials.

My guess would be it is some kind of Stramit type straw board that has expanded between the studs/framing.

 

[Rob.Ita]

Hi - its a no fines build - pebbles bonded together with concrete. Admittedly I don't know what the stud walls are made from. As well as the wavey walls, I have the faint outline of roof beams appearing in my ceiling, with some thin ceiling cracking at the beam locations. Seems like everything is being pressed down - again - related? Cheers. Rob

 

[Nige F]

The fundamental question is what are the internal stud walls built from? If it is non-traditional construction house the internal partitions could be built from all sorts of weird and wonderful materials.

My guess would be it is some kind of Stramit type straw board that has expanded between the studs/framing.

Looks that way - tight on the studs and bowing out in the middle - same on ceilings. Get in a cupboard and examine the wall structure

 

[Rob.Ita]

If it is this, any reason why it would expand? This has happened in multiple rooms upstairs and downstairs in a relatively short period. Thanks. Rob.