The building was not 'fireproofed'.
firefighters in 'fireproof' suits
(..) All right, OK, you've gotta kind of angle yourself. OK, no, no, no. Come back down towards me! Come back down... Yeah! Come on. No, thanks. I'm good. Not so fireproof on the inside, are you? Here you go. Everything we know about you guys is wrong. Dad! You're back! Gobber's not here so... I know. (..)2010 How to Train Your Dragon