Ask an expert

Get free help from our community of tradespeople

Double-insulated garage roof and an air gap.

Posted by Martin Evans, on
I have 100mm deep roof trusses and 50mm Kingspan; I plan to line the inside/bottom of the roof trusses with ThermaWrap (foil-covered bubble wrap) for both insulation and light reflection purposes. Where should I leave the air gap; between the Kingspan and the tiles (i.e. outermost) or between the Kingspan and the ThermaWrap (i.e. innermost)? TIA

martin wilburn

Hi Martin You must leave an air gap (minimum of 50 mm) between the tiles and insulation to prevent condensation build up.
(1) Was this helpful?

What would you like to do now?

Find more questions Create my Job

Homeowner stories

Homeowner stories - Nick

Nick shares his story of finding local tradespeople in his new area.

app-icon

Get our app for homeowners

  • Send messages and get notifications from tradespeople
  • Add photos to get more accurate quotes
  • View tradespeople’s profiles