1920's Detached Bungalow IWI

[dipz1110]

Hi Everyone, 

 

I've been searching the forums for opinions and solutions (of which you are all very knowledgeable) but I am yet to come across the specifics of what I am after. 

 

I have a 1920's detached bungalow on which I'm planning on doing some significant works to including a loft conversion. For the walls which will remain, i'd like to apply IWI but am unsure as to which method would be the best solution to avoid any future damp problems. I know that we do have a cavity, but it is small and doesn't have any insulation within.

 

Am I able to put the insulation right up against the existing wall or do I need to leave a gap?

 

Can I use PIR or do I need to use a mineral wool type insulation to avoid any condensation? Do I need to add a vapor control layer?

 

Thanks for any advice!