Browse Forums Heating, Cooling & Insulation 1 Dec 23, 2015 11:35 am Hi Guys this is my first post actually asking for advice, haha. Usually giving it in the kitchen section! We purchased a house that's only 4 years old, 2 story brick veneer slab on ground. It has a tiled roof with insulation but no sarking. The upstairs bedrooms get very warm on hot days. I have fitted two large whirly birds but they don't seem to make much difference to the temp in the roof space. Is there an easy way of adding sarking(or a different product) now?? Also is there anything else I can do to bring the temps down?? Thanks Cutting Edge Kitchens and Cabinet Making http://cuttingedgekitchens.net.au http://www.facebook.com/pages/Cutting-Edge-Kitchens/290484196676 Mobile : 0419 430 575 PH: 9452 4772 Fax :9452 4772 cuttingedgekitchens@outlook.com Re: Roof temps and sarking 2Dec 23, 2015 11:48 am Ever seen the solar powered fans that you install instead of whirly birds ? The one I have here exhausts as much air as 30 of the standard whirly birds. Being that they are solar powered, there's no ongoing costs. I doubt retro-fitting sarking is going to be really worth the effort and expense involved. Owner Building at Jimboomba Woods in Logan City Qld. Blog : http://bandlnewhomebuild.blogspot.com H1 thread : viewtopic.php?f=38&t=68283 . t 3Dec 23, 2015 11:59 am bpratt Ever seen the solar powered fans that you install instead of whirly birds ? The one I have here exhausts as much air as 30 of the standard whirly birds. Being that they are solar powered, there's no ongoing costs. I doubt retro-fitting sarking is going to be really worth the effort and expense involved. Yep, have seen them before. Are they really that much better? What brand do you use?? Yep agree retro fitting sarking will be way to expensive. Was hoping there was another product that might do the same job but be easier to fit. Cutting Edge Kitchens and Cabinet Making http://cuttingedgekitchens.net.au http://www.facebook.com/pages/Cutting-Edge-Kitchens/290484196676 Mobile : 0419 430 575 PH: 9452 4772 Fax :9452 4772 cuttingedgekitchens@outlook.com Re: t 4Dec 23, 2015 12:08 pm CuttingEdgeKitchens bpratt Ever seen the solar powered fans that you install instead of whirly birds ? The one I have here exhausts as much air as 30 of the standard whirly birds. Being that they are solar powered, there's no ongoing costs. Yep, have seen them before. Are they really that much better? What brand do you use?? . Can't quite remember the brand off hand, but it cost me around $800 for one, which is all I have in the roof. From memory that fan should do a house much larger than mine is. Owner Building at Jimboomba Woods in Logan City Qld. Blog : http://bandlnewhomebuild.blogspot.com H1 thread : viewtopic.php?f=38&t=68283 . Re: Roof temps and sarking 5Dec 24, 2015 6:32 am I wouldn't be considering retrofit of sarking. Do you have good insulation in the ceiling? 2 storey houses are known to be hot upstairs. Reverse cycle aircon fitting upstairs maybe or evap cooling for upstairs. Re: Roof temps and sarking 6Dec 24, 2015 7:28 am goody59 I wouldn't be considering retrofit of sarking. Do you have good insulation in the ceiling? 2 storey houses are known to be hot upstairs. Reverse cycle aircon fitting upstairs maybe or evap cooling for upstairs. I wasn't really considering retro fitting sarking, I have seen products overseas that do the same thing but are sprayed on to the underside of the tiles. Its similar to an expanding foam but specific to the task. Sarking or a similar product makes a huge difference to roof temperatures and takes load off the insulation. Unfortunately Evap cooling systems don't work that well this close to the coast and we don't have the money (well over $10,000) to aircon our home. In the front of the house we had two silly windows 1800x1800mm that wind open from the bottom. They didn't let any air in at all. I purchased new ones ($400each) and replaced them. It has made a huge difference. I am looking for cost effective ways to make our home as efficient as possible before fitting aircon, this will save us money in the long run! Cutting Edge Kitchens and Cabinet Making http://cuttingedgekitchens.net.au http://www.facebook.com/pages/Cutting-Edge-Kitchens/290484196676 Mobile : 0419 430 575 PH: 9452 4772 Fax :9452 4772 cuttingedgekitchens@outlook.com Re: Roof temps and sarking 7Dec 24, 2015 6:45 pm What sized eaves do you have on the top storey roof? I still find it astonishing that builders sell house plans in tropical and subtropical climates that have little or no eaves. Easily one of the dumbest things you can do from a passive thermal performance perspective... but they get away with it by insulating the buggery out of the walls which means the house doesn't get a chance to purge heat naturally, and you're left with no choice but to air condition... anyway I could go on forever about that... as you can see it gets me a bit riled up Building Services Engineer Renovating our 1960's modernist home in Brisbane https://forum.homeone.com.au/viewtopic.php?f=53&t=82091 Re: Roof temps and sarking 8Dec 25, 2015 8:28 am 1960sModernistHome What sized eaves do you have on the top storey roof? I still find it astonishing that builders sell house plans in tropical and subtropical climates that have little or no eaves. Easily one of the dumbest things you can do from a passive thermal performance perspective... but they get away with it by insulating the buggery out of the walls which means the house doesn't get a chance to purge heat naturally, and you're left with no choice but to air condition... anyway I could go on forever about that... as you can see it gets me a bit riled up We have 500mm eaves luckily. There are no vent holes in them. I was going to cut some vents into the underside of the eaves to allow air into the roof cavity making the roof ventilators more efficient. Cutting Edge Kitchens and Cabinet Making http://cuttingedgekitchens.net.au http://www.facebook.com/pages/Cutting-Edge-Kitchens/290484196676 Mobile : 0419 430 575 PH: 9452 4772 Fax :9452 4772 cuttingedgekitchens@outlook.com Re: Roof temps and sarking 10Dec 25, 2015 11:20 pm or this https://www.masters.com.au/product/9000 ... ventilator I looking at a couple of these for home myself. Re: Roof temps and sarking 11Dec 26, 2015 10:03 am This is the one that I got. :- http://eurodevices.com.au/shop/energy/s ... ntilation/ 3000 cu m of air per hour ... when the standard whirly bird is something like 100 cu m/h ... bit difference. Owner Building at Jimboomba Woods in Logan City Qld. Blog : http://bandlnewhomebuild.blogspot.com H1 thread : viewtopic.php?f=38&t=68283 . Re: Roof temps and sarking 12Dec 27, 2015 8:03 am http://www.bunnings.com.au/csr-edmonds- ... t_p0810757 This would be my pick. Why? It is thermostatic controlled and can be turned off for winter when warm air in your roof space is advantageous for reducing heating bills. You need power in your roof space but most homes have a power source up there for this or that. Re: Roof temps and sarking 13Dec 27, 2015 5:38 pm You could add reflective foil on top of the insulation batts. That might make some difference. I don't think powdered ventilators are going to make that much of a difference to the heat load when you consider the energy input required to run them. A few whirlybirds and well ventilated eaves should be sufficient. Are the external walls insulated? 500 eaves are pretty small, and two storey brick walls soak up a lot of solar heat gain which transfers into the building. Even insulation is subject to the law of sharply diminishing returns, once you get to a sensible R-value for the local climate, doubling the R-value only gives slight improvements to energy performance. The best thing you can do is insulate the roof and shade the walls and windows, with big eaves (e.g 700-1200mm) and/or window shading. Upstairs will always be noticeably warmer that downstairs, simply because obviously warm air tises, and also the bottom storey has a 3 metre air gap between it and the roof space...very effective insulator! Re: Roof temps and sarking 14Jan 16, 2016 9:30 am Actually, solar powered vents leave the whirly birds in the dust for efficiency. Whirly birds just can't shift enough hot air. But to really make a difference you need to stop the radiant heat using reflective foil. If it was me, I would be retrofitting reflective foil underneath the tiles. Annoying, awkward but worth it. Building Standards; Getting It Right! Hi all I’m in VIC and had some storm damage in my garage a month ago. Gutter found not fit for purpose. Insurance company saying the guttering and flashing to be fixed… 0 11713 This certainly doesn't look good. I would be engaging with an independent inspector to have a look at this. As for the unscheduled site visits, most builders are quite… 1 28319 Hey. Head to a metal and decide on which profile you will use first. Profiles with larger corrugations can greatly change the appearance of the color in different… 0 3384 |