Replace block wall with stud wall

[Poe]

Could I replace the block wall in the photo with a load bearing stud wall.
The blocks in the existing wall are some kind of light weight block and can easily be gouged with a screwdriver blade.
The wall is poorly constructed and the mortar is crumbling under the roof joists.
It is tied into the cavity walls and don't want to loose stability.
I would look to build the stud wall using 2x4 C24 with double header plate and studs under each joist before removing the block wall.
Would this seem ok, any advice would be great.
Thanks

 

[blup]

Would probably work in principle if the loadings worked but the wall might also be providing lateral support to the side walls it’s joined to.

 

[Poe]

Thanks blup,
It's more this that I'm unsure of with regards to lateral support.
Is there a way of deducing if this is the case?

 

[^woody^]

It won't be providing any lateral support

You may need to fit timber board - ply or OSB to at least one side to provide racking resistance. Or some more elaborate diagonal bracing within the frame. It depends on the loads

 

[Harry Bloomfield]

Thanks blup,
It's more this that I'm unsure of with regards to lateral support.
Is there a way of deducing if this is the case?

The block wall is obviously designed to provide some lateral support, to the inner cavity, on the left, because it is keyed in to it, so that support needs to be maintained.

 

[cdbe]

The block wall is obviously designed to provide some lateral support, to the inner cavity, on the left, because it is keyed in to it, so that support needs to be maintained.

Or it's keyed in to provide lateral support to the block wall itself. Ive done the same swap in my house - failed due to only tied in above the door frame at the other end - the door action literally shook the wall to bits.

 

[Poe]

Thanks guys,
Slightly differing opinions.
Is there any way the add lateral with a stud wall in addition to lining the faces with ply?

cdbe my wall is only tied into the one wall the other end (above the door) isn't tied as you can see they have used two blocks day on their ends.

The plasterboard passes over the top of the wall so it's sandwiches between the wall and the ceiling joist which I think normally indicates its not load bearing.

It's now more the lateral support that could be an issue, I don't mind "over engineering" the new stud wall for peace of mind.

 

[cdbe]

Mine was just the same, a single plasterboard in an
"L" shape around the door on each side made mine sufficiently rigid but you could put ply or OSB on first.