Internal partition wall - does it need a vapour barrier?

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Hi everyone

I have a loft conversion that previously had an open staircase into the space. In an effort to make it into a proper bedroom, I’ve removed the bannister and replaced it with a 3x2 wall
image.jpg

Once it’s finished, I’ll be adding 50mm insulation and then taping with foil and covering with plasterboard, but I won’t be skipping. I’m just going to tape and joint.

On one side of the wall is the bedroom, which has a single radiator, and also air conditioning. On the other side is the stairs which links to the other three floors in the house.

In this instance, does anyone think I need to put a vapour barrier in, and if so, on which side would be considered warm?

Thanks!
 
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Thanks so much man, appreciate the response. Have a great week!
 
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