Insulating corrugated tin roof

[Hager]

Hi,

Renting a garage and the roof is absolutely soaking so going to install some celotex with a vapour barrier but not sure if I should install it with a 10mm gap between the roof and celotex or flat against the roof?

 

[Wayners]

Cold roof then.
Lots of videos on that.

Spray foam on the underside of the roof is the way I do it

 

[hllns]

For a rented garage it seems a bit pointless. It won't/can't be heated and won't have lots of sources of moisture in it. Why's the roof so wet? Leaking?

 

[Hager]

It's going to be long term, so I don't mind putting some effort into it. Didn't want to go down spray foam because it means scrapping it all off when I leave.

Have been toying with the idea of framing the walls out if i can get the materials ultra cheap, it's a stones throw from my house so was going to put some lights in there, can always add a heater.

Water does leak in under the floor from the garages either side, when it drys will run some silicone round the edges. The roof itself seems pretty sound.

 

[Wayners]

Use CT1 or stixall type polymer as sticks to wet.
Way better than silicone.
Have you watched skillbuilder on YouTube. Look up cold roof vs warm roof on that channel