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I want to install a false ceiling on the top floor in the classrooms of a school.

I have installed a grid structure and now, instead of using gypsum boards, I want to use XPS insulation boards of 1" and more.

My question is: how can we putty-paint those boards so they give an aesthetic look to the classroom?

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As Steven mentions, this is not to code in most places. –  DA01 Mar 21 at 12:31

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XPS must be covered with drywall or another fire resistant material. XPS, when exposed to heat will put off toxic fumes and will melt. The last thing you want in a class room is molten foam melting onto students in the event of a fire.

Stick with proper ceiling tiles, drywall or another suitable material. What you are proposing would be against most building codes that I know of, at least in North America.

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Definite need for the drywall cover, you don't want a "Great White" Station Nightclub Disaster. Especially in a school. Because foam caught fire. –  Fiasco Labs May 27 at 17:55

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