length of wall

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I have just become aware of windposts and have been trying to understand, so have I got this right?
I have completed drawings for extension to bungalow, imagine a new box attached to existing. The gable end walls are 6700mm long, one of which has a chimney half way along. One of the walls between the gable walls is 9900 long and has 2 french casement openings each 1800 wide. The other wall of the box connects to existing structure and has maximum length of wall of 4500. Walls are 350 wide cavity walls, external leaf 7.3 conc blocks, inner leaf 3.6 aerated blocks plus insulation.
Ceiling height to be 2700mm.
As I understand it, I need to have this 9900 wall buttressed, or failing that incorporate a windpost.
I had intended to have a studwork wall midway between the 2 french casements, each with 500mm reveals to stud wall.
This stud wall was to be bolted to the conc slab and to have 18mm OSB fixed to either side.
Have I got this right, or does this specification not meet the buttressing demand and I must have the posts??? IMG_20240805_083907.jpg
 
Last edited:
Well I eventually managed to attach something to look at - it took time, I'm old, I have white hair ...... what can I say??
Anyway ....... I suppose I could reduce dims by a metre to take it out of the requirement, but I would rather not
 
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