I've a top floor apartment in India which gets almost like an oven during the summers which is like for 9 months out of 12. I've decided to apply under the deck XPS 50mm (nailed to the ceiling). I dont want to do a gypsum false ceiling after that, since I like to keep the height and cost low. The supplier (Supreme Petrochem) suggests to apply putty + acrylic paint over the XPS board, but I'm skeptical and dont know if that will crack. I'm thinking of just sticking wall paper over it. Any experience of such application & suggestions will be appreciated.
Ceiling – paint over XPS insulation
ceilinginsulationwallpaper
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Best Answer
Dow, a manufacturer of XPS products, on their India web site, does not recommend using XPS under a roof deck. This is due to the possibility of condensation occurring between the insulation and the structure.
As far as painting goes, US codes require a 15 minute thermal barrier over an interior foam, in the event of fire. This could be satisfied by gypsum wallboard, obviating the need to paint. For noninsulation interior uses, Dow permits latex paint.
Instead, they recommend using an "inverted roof" where the panels are placed OVER the waterproofing and covered with a ballast material that will weigh the panel down and protect it from sunlight.