Open a window ? my architect hasn’t questioned any of it there’s extraction fans in kitchen/bathrooms etc. Each time I read something crops up so now guessing I best plan for this. Yes it’s additional and takes the uvalue down further
sip info
Kingspan TEK™ utilises Kingspan’s high performance, fibre-free rigid thermoset Urethane Insulation for the core of the SIP panels, which is autohesively* bonded and sandwiched between two sheets of oriented strand board (OSB/3).