fitting upvc door in timber frame extension

[elmsoft]

HI
Where exactly in the aperture of cavity walls do door frames sit? Do they span the ( 50mm) cavity or sit entirely in the ( 120mm ) timber frame. I am assuming they don't attach to the block work outer leaf?

 

[God]

The back of the frame sits to the inside of the outside block work a cavity closer then spans the cavity

 

[elmsoft]

so that means the frame screws into the block work and the plaster finish covers the timber frame and closer?

 

[crank39]

Correct

 

[elmsoft]

Thanks to you both for explaining that detail.
I am happy to get on with it now!