If you look here arcachon
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Stewie
Browse Forums General Discussion Re: Colorbond roof 21Jun 26, 2016 10:43 am Quote: I've heard people talk about a darker shade being hotter. Is their any data available on the variations between the colourbond colours on how much heat transfers through? If you look here arcachon http://www.steel.com.au/products/coated ... sification Stewie Re: Colorbond roof 22Jun 27, 2016 1:48 pm arcachon I've heard people talk about a darker shade being hotter. Is their any data available on the variations between the colourbond colours on how much heat transfers through? I can only talk about my own experience at my old house. The roof was just plain old zincalume that had aged over 25 years at the time. I painted in the colourbond colour Thredbo White. On a moderately sunny day I could easily have a picnic up on the roof, however a spot that I had not painted because at the time it was under solar panels that were later moved, you'd easily burn your hand. Nothing scientific, but it the unpainted section was that hot, then some of it much re-radiate in to the ceiling space, but with the painted section was not warm at all. Owner Building at Jimboomba Woods in Logan City Qld. Blog : http://bandlnewhomebuild.blogspot.com H1 thread : viewtopic.php?f=38&t=68283 . Re: Colorbond roof 23Jun 27, 2016 2:21 pm Good link Stewie. It is good to see some consideration given by BASIX to roof top solar absorptance but the codes still largely ignore the environmental vandalism caused by urban sprawl. At the very least, heat reflective paints should be mandatory use on new homes and renovations. The two links below discuss heat reflective paints and solar absorptance. http://solar.org.au/papers/10papers/10_134_POCKETT.pdf http://www.astecpaints.com.au/heat-refl ... paint.html 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Colorbond roof 24Jun 27, 2016 8:05 pm SaveH2O Good link Stewie. It is good to see some consideration given by BASIX to roof top solar absorptance but the codes still largely ignore the environmental vandalism caused by urban sprawl. At the very least, heat reflective paints should be mandatory use on new homes and renovations. The two links below discuss heat reflective paints and solar absorptance. http://solar.org.au/papers/10papers/10_134_POCKETT.pdf http://www.astecpaints.com.au/heat-refl ... paint.html I agree with you and also that most new housing estates are nothing short of a scar on the landscape, but I think the biggest impact to the urban heat island effect is perhaps less to do with the colour of roofs, but more to do with the fact that if you fly over a new estate all you see is roof, driveways and bitumen. I.e. it's the planning policy at high level that is the root of the problem. Roof colour policies, whilst worthy, is really just akin to rearranging the deck chairs on the titantic. Re: Colorbond roof 25Jun 27, 2016 9:30 pm I agree but decreasing roof top and driveway absorptance is a really easy minimal cost place to start. I would also like to see a % of stormwater diverted to groundwater recharge points, environmental credits given for green landscape areas, organic free stormwater flowing to our waterways and solar power with home storage systems on all new homes as other rapid implementations...then we can start to get serious. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Colorbond roof 26Jun 28, 2016 12:03 am Stewie D Quote: I've heard people talk about a darker shade being hotter. Is their any data available on the variations between the colourbond colours on how much heat transfers through? If you look here arcachon http://www.steel.com.au/products/coated ... sification Stewie Thanks mate. Exactly the info I was after. Still have to wonder if there's a noticeable difference between heat absorption of 0.69 and 0.75 Re: Colorbond roof 27Jun 28, 2016 7:44 pm Difference? Yes, by the laws of physics. Noticeable? I'd seriously doubt it. I'd go with the colour you like rather than one you don't just for the sake of the low solar absorption. You can probably negate the marginal effect by upgrading your insulation and/or anticon. You look at your roof everyday, don't not like it. Re: Colorbond roof 28Jun 28, 2016 9:01 pm jas0nt Difference? Yes, by the laws of physics. Noticeable? I'd seriously doubt it. I'd go with the colour you like rather than one you don't just for the sake of the low solar absorption. You can probably negate the marginal effect by upgrading your insulation and/or anticon. You look at your roof everyday, don't not like it. Light coloured roofs have been found to reflect about 50% more heat than dark colours. Roof colour (light or dark) makes quite a substantial difference to the energy performance of a building, especially when we do JV3 assessments for non-residential buildings. I certainly wouldn't use the term "marginal". It's actually significant. Ask any tradie who has to climb onto a roof or into a roof space - certainly noticeable difference. You're correct in saying reflective sarking and additional insulation can make up for it in terms of heat gain inside, but this doesn't do anything for the bigger picture problem of urban heat island effect - which to be fair is more of a government policy issue rather than a personal one Re: Colorbond roof 29Jun 29, 2016 8:46 am Quote: Ask any tradie who has to climb onto a roof or into a roof space - certainly noticeable difference. I can vouch for that. Years ago I did a major reno and extension not far from here and after I'd finished they asked me to create a storage attic in the roof space. It was January and a pretty hot summer but I was waiting to get the go ahead for another job so said OK. We climbed up in the roof space and couldn't believe how hot it was up there. It was a dark coloured tile on the roof, really old sarking that had numerous holes in it and just stifling. The next day i bought my thermometer from home and hung it from one of the rafters. 52ºC. We ended up taking half a dozen tiles off the roof and cut a hole in the sarking to allow for a bit of ventilation. It was still a bugger of a job but bearable. Stewie Your house roof does not show rusting other than some surface rust on the flashings. In my opinion you dont need to replace or paint the roof other than treat surface rust… 1 10105 You should pressure clean your roof first and make sure the paint you buy also is anti mould. 4 17582 Hi all, Our boundary perimeter fences need replacing (3 sides). From everyone's experience, what would you install? Timber lapped and capped OR colorbond? Thank you. 0 2825 |