What is a sandwich panel? A plain-English Australian guide — EPS, PIR and Rockwool cores compared, where each panel type is used, typical prices per m2 and what to check before you buy.

Most cool room installations do not fail because someone joined a panel badly. They fail because the slab was 15mm out, the door was hung on the wrong wall, or nobody thought about where the condensate drain would go until the room was already up....