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

 

 

[Galgt4]

I’ve just had a corner post made from IG lintels but this was for single storey brick extension. 
 

not sure if it’s a similar setup but the post sits in middle of cavity and the bifolds come with their own post which goes on outer leaf. Then you just box around it. 
 

may not help but it may give you an idea. Sorry can’t post full spec due to copyright.

 

base plate bolts to foundation then bricked over 

 

[markc]

Keeping the post inside of the thermal envelope is the best option. A post inline with the outside looks great but presents you with a big thermal bridge.

[Andehh]

Worth thinking about the future enjoyment, resale and visual wow vs thermal bridge factor. 95% won't know what thermal bridge is, but losing floor space and cutting into usable floor space and losing aesthetic lines could jar people. 

Edited 15 hours ago by Andehh