This is doing my head in. I've done a suspended floor build up accurately in Ubakus and get a U-value of over 0.3W m–2 K–1 which seemed high; then did the same in Kingspan's calculator and got 0.19W m–2 K–1 .   Is there some obvious error I've made? Trying to work out if I can comply with Part L for upgrading existing floors...