Browse Forums Building A New House 1 Jul 16, 2020 2:19 pm Hi There, Our builder is providing R4.1 ceiling insulation and R2.5 wall insullation. But we are planning to increase the ceiling insulation from Bradford R4.1 to 6.0 and for walls - R2.0 to R2.5. We tried doing some research but couldn't find if that's worth. Any advice will be really healpful. Thanks, M Re: Wall and Ceiling insulation upgrade 2Jul 16, 2020 2:26 pm It depends on where you're located, but in general more insulation is better. But there comes a point where the extra performance is marginal, and the costs outweigh the benefits. We're south of Sydney near the ocean, and have 5.1 (3.5 + 1.6 anticon) in the roof, and 2 in the walls. We have no heating or cooling, and I'm walking around in the evening in shorts and a jumper and am perfectly comfortable - so from experience so far it's not work upgrading (noting we haven't had a summer yet). But if I was in a more extreme climate area, like Tasmania, North Queensland or western NSW, it may well be. This is a good resource https://www.yourhome.gov.au/passive-design/insulation Re: Wall and Ceiling insulation upgrade 3Jul 16, 2020 6:02 pm Where the curve is more vertical is where most of the action occurs. Once it starts flattening out, you get less and less from more and more. I decided that I was happy with R 4.0 for roof as the incremental gain is not much by upgrading https://www.energyvanguard.com/blog/769 ... Insulation Re: Wall and Ceiling insulation upgrade 4Jul 19, 2020 10:40 am dga It depends on where you're located, but in general more insulation is better. But there comes a point where the extra performance is marginal, and the costs outweigh the benefits. We're south of Sydney near the ocean, and have 5.1 (3.5 + 1.6 anticon) in the roof, and 2 in the walls. We have no heating or cooling, and I'm walking around in the evening in shorts and a jumper and am perfectly comfortable - so from experience so far it's not work upgrading (noting we haven't had a summer yet). But if I was in a more extreme climate area, like Tasmania, North Queensland or western NSW, it may well be. This is a good resource https://www.yourhome.gov.au/passive-design/insulation Thank you. Yea, it makes sense. Re: Wall and Ceiling insulation upgrade 5Jul 19, 2020 10:41 am BROKEANDEXCITED Where the curve is more vertical is where most of the action occurs. Once it starts flattening out, you get less and less from more and more. I decided that I was happy with R 4.0 for roof as the incremental gain is not much by upgrading https://www.energyvanguard.com/blog/769 ... Insulation Thank you, looks like adding more insulation will help little. Re: Wall and Ceiling insulation upgrade 6Jul 21, 2020 11:58 am I think 4 to 6 there is still a decent amount of gain but beyond that there is no need. Most high performing non-passivehaus (still reasonably affordable) houses I've seen are spec'd at R6 in the ceiling. But yeah, depends on a lot of things. Found the answer. The recommended distance is .... 1 5957 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 |