Browse Forums General Discussion 1 Jul 23, 2020 9:41 pm Does anyone know if there's a major diff. b/n R2 and R2.5 wall insulation. Apparently min. recommended R value in Melbourne is 2.5. But cost saving is significant if I choose to go with R2.0. Is it worth spending the extra money for R2.5 insulation. Similarly with roof insulation, they reckon R5 minimum for dark roofs. Anyone care to comment based on experience etc.? Cheers, Re: Wall insulation 2Jul 24, 2020 10:27 am Yes that seems to be the recommendation but not sure if it's mandated. Melbourne is in Climate zone 6 but even the biggest name builders only provide R4.0 for roofs and R2.0 for walls. I've seen a couple of smaller builders have R3.5 for their walls. [url=https://ncc.abcb.gov.au/ncc-online/NCC/2016-A1/NCC-2016-Volume-Two/Part-312-Energy-Efficiency/Part-3121-Building-Fabric/3121-Application?inlineLink=%7B461F99A1-290E-414B-96AE-04A5235CB7EF%7D]https://ncc.abcb.gov.au/ncc-online/NCC/2016-A1/NCC-2016-Volume-Two/Part-312-Energy-Efficiency/Part-3121-Building-Fabric/3121-Application?inlineLink=%7B461F99A1-290E-414B-96AE-04A5235CB7EF%7D[/url] Re: Wall insulation 3Jul 24, 2020 10:34 am If you have a dark colour roof (in fact any colour really) I'd opt for sarking under the tiles. There are a few benefits to that. Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 I am saying that double brick has similar thermal performance due to thermal mass effect. It will be still very interesting to see the state of your framing after 10-15… 10 29741 Hi all, Just wondering if anyone had suggestions on installing/replacing wall insulation on an external wall which doesn't have wrap, our miners cottage being constructed… 0 4933 1 19709 |