summerhouse insulation

[mark1970]

Hi all
Complete newbie here (hgv driver ) not a clue whith diy, i have a summerhouse in the garden which im using as a bar/tv room away from the missus, im looking at what the best insulation would be for it.
the summerhouse is 10ft x 12 ft, and its tallest point internally is 2.1m and i need 40mm insulation, what is the best to get.
Any roasting appreciated and the taking of **** welcome.

 

[noseall]

i need 40mm insulation, what is the best to get.

PIR foil sandwich i.e. Celotex, Kingspan, Unilin etc

 

[mark1970]

ok thank you and what about to cover that plaster board or ply

 

[noseall]

ok thank you and what about to cover that plaster board or ply

Plasterboard (and skim).