Vertical Steel between two Bi fold doors - Position / fixing query

[JamieB1917]

Im in the process of building a garden room, two walls will be block and the other two will be Bi-fold doors. I was originally going to build a brick pillar where the two doors meet but my friendly builder suggested installing a steel 4 inch post between the doors. This will support the two lintels over the bi folds.

 

Ive had a look on line and i came across https://www.thegardenroomguide.co.uk/choose-a-structural-corner-post-to-enhance-your-garden-connection/2024/09/04/ which provides some images of the type of thing im after. 

 

 

 

My first question is where would the best location to install the post, on the external wall in the corner level with the brick course, inside of the external brick course , or outside of the external brick course wall. Im concerns about thermal bridging from the vertical steel. 

 

Second question is where should the column fix to?

 

1 - The concrete footings which are currently approx 200mm above ground level / 375 below DPC or 

2 - Above the DPC fitted to a brick and concrete footing

 

 

 

Any help would be appreciated.

 

Thanks Jamie