To achieve the passivhaus standard passive roofs need high levels of insulation, thermal bridges need to be eliminated and the structure itself needs to be airtight. The Irish standard (Part L 2011) for a traditional roof structure is 0.16 W/m2K; this is very close to the passivhaus standard (0.10 – 0.15 W/m2K) however it still does satisfy it.
To gain a deeper understanding of the passivhaus standard it is crucial to examine the difference between traditional Irish roof systems and Passive Roofs; again like before I have taken the two most common systems:
1. Block Cavity
2. Timber Frame ( 33 Votes )