Well it contains cardboard and wood, so it's made of cardboard and wood, among other non-flammables. If I say the house I live in is made of stone, brick, cement and rocks, obviously you know it has windows and insulation, and whatnot. It's still made of stone.
Drywall is two sheets of paper/cardboard cladding (increasingly) low density gypsum.
Soundproofing material is also often made of cardboard (though we do have alternatives for that, unlike drywall).
Right, so the house is not constructed out of cardboard. Soundproofing in my part of the US is often rockwool and not cardboard.
Well it contains cardboard and wood, so it's made of cardboard and wood, among other non-flammables. If I say the house I live in is made of stone, brick, cement and rocks, obviously you know it has windows and insulation, and whatnot. It's still made of stone.
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