Browse Forums Heating, Cooling & Insulation 1 Nov 13, 2012 10:57 am I'm from the US and have been looking at insulation values here. I'm seeing products with r values of R2.5 or R3.5. In the US we use fiberglass batts with R values of R15 or R19 for walls, and in attics are generally R30. So what gives? are your r values really that low, or do they measure them differently, or what? Re: Insulation R values please explain?? 2Nov 13, 2012 11:18 am American Insulation is generally higher than Australian Levels mainly due to the colder winters. However there is also a difference in conversion which is probably due to America not adopting the metric system. An example is USA R value of 30 converts to an Aussie R value of just over 5. If you look at this link http://www.anewhouse.com.au/?cat=21 on my blog you will find posts on how we work out R values. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Insulation R values please explain?? 3Nov 13, 2012 11:27 am bashworth American Insulation is generally higher than Australian Levels mainly due to the colder winters. However there is also a difference in conversion which is probably due to America not adopting the metric system. An example is USA R value of 30 converts to an Aussie R value of just over 5. If you look at this link http://www.anewhouse.com.au/?cat=21 on my blog you will find posts on how we work out R values. 100% agree...^^^^^ "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Insulation R values please explain?? 4Nov 13, 2012 2:13 pm bashworth American Insulation is generally higher than Australian Levels mainly due to the colder winters. However there is also a difference in conversion which is probably due to America not adopting the metric system. An example is USA R value of 30 converts to an Aussie R value of just over 5. If you look at this link http://www.anewhouse.com.au/?cat=21 on my blog you will find posts on how we work out R values. ah good information thanks! It didnt quite explain the difference though, so i went searching and found that probably the Australian system uses The International System of Units (SI) Where as in America they use an R value based on the insulator defined to be 1 divided by the thermal conductance per inch. This means R is an abbreviation for the complex unit combination hr·ft2·°F/Btu. In SI units, an R value of 1 equals 0.17611 square meter kelvins per watt (m2·K/W). Thanks. I wish there was a youtube video explaining this concept. 10 26590 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 23180 Hey guys building a new place through a volume builder and just wondering if i should complain to the site supervisor as we just had plasterboard installed. Looks like… 0 8929 |