Steel Corner Post insulation

[Ay8452]

Hi folks,

 

I have a steel 200 x 200 corner post as part of a corner set of sliding doors. Had a read of very useful previous threads 

 

Looking to insulate this and was going to do the following

 

1 - on the external two sides place PIR board (any specific type I should use as it may be exposed to the elements?) or EPS board

2 - Internal two sides place vertical strips of aerogyl as space is a premium here (the corner post is inline with the the inner leaf for one wall and then cavity centre for the other wall, therefore I have more space externally hence use of PIR board/EPS in that location)

3 - wrap the post in a VCL (any recommendation on a brand/type?)

4 - clad the steel post with timber

5 - Fit sliding doors/Alum cladding around post

 

Does this sound about right? Should I just stick to one type of insulation and sue aerogel?

 

See pic below of my structural drawings

 

 

Then added my insulation below (orange being EPS/PIR) and green being aerogyl.

 

 

 

[Nickfromwales]

Use Marmox or Jackoboard (XPS), and you won’t need a VCL. Have the cuts butted up tight and use CT1 to bond the boards to the steel, using continuous lines of it to stave off convection airflow between the steel and the boards.

 

Aerogel vs XPS = near zero real life differences tbh, but if you can use the thickest board you can then every extra mm will be a bonus.

 

I’d avoid PIR as you can’t fix much to it without it delaminating. 

[ETC]

Will the thermal loss be any greater than through the adjoining window?

[Gus Potter]

On 13/04/2025 at 18:25, ETC said:

Will the thermal loss be any greater than through the adjoining window?

This is pragmatism and actually very clever.