Browse Forums General Discussion 1 Feb 09, 2013 1:22 pm We have a large roof cavity which does not have any way to ventilate. During summer our house remains hot well after the southerly has swept through and the outside temperature has come down. I was wondering whether installing Whirly birds would be likely to help the situation? Re: Whirly birds 3Feb 09, 2013 2:49 pm D101 We have a large roof cavity which does not have any way to ventilate. During summer our house remains hot well after the southerly has swept through and the outside temperature has come down. I was wondering whether installing Whirly birds would be likely to help the situation? yes very much so we had 3 installed at our old house and they worked a treat we will have them installed in our new house when it is built. note: buy the good ones not the hardware ones have look at this web site http://www.twista.com.au/ Deposit on land 20/03/12 Deposit with Builder 01/07/12 Tender signing 12/10/12 Into Council 20/01/2013 Site work started 30/04/2013 Keys 15/11/2013 What can i do tomorrow better then today Re: Whirly birds 6Feb 10, 2013 1:38 pm I have one because it was fitted when I bought my place. IF you want your roof ventilated you would need several plus the soffit vents, however IF your ceiling is adequately insulated why bother with whirlybirds? How effective are they in the middle of summer on a blazing hot day with no wind? Or a stinking hot northerly blowing that's only replacing hot air with more of the same? There are pages of argument on the Whirlpool site that hasn't convinced me of their value Arfur Re: Whirly birds 7Feb 11, 2013 7:53 am I agree Uncle Arfur. If both your roof and ceiling are well insulated then there is probably no need ( plus they look as ugly as sin ). For a quick fix in a roof with minimal insulation they are probably a good idea. If you have gable ends to your roof then fitting a gable vent each end is a better alternative. Stewie Re: Whirly birds 8Feb 11, 2013 9:09 am Yogybear Yes I would and I would also add vents. Yes - vents help them work. Re: Whirly birds 9Feb 11, 2013 1:11 pm Uncle Arfur I have one because it was fitted when I bought my place. IF you want your roof ventilated you would need several plus the soffit vents, however IF your ceiling is adequately insulated why bother with whirlybirds? How effective are they in the middle of summer on a blazing hot day with no wind? Or a stinking hot northerly blowing that's only replacing hot air with more of the same? There are pages of argument on the Whirlpool site that hasn't convinced me of their value It not just heat removal but vent out them cooking smells and moisture from internal exhaust fans from the kitchen and bathrooms. Re: Whirly birds 10Feb 12, 2013 10:46 am Quote: It not just heat removal but vent out them cooking smells and moisture from internal exhaust fans from the kitchen and bathrooms. Well that's illegal for a start Lourance. No kitchen extraction fan is allowed to terminate inside the ceiling space due to fire hazards. Numerous fires in ceilings over the years prompted law changes over twenty years ago. It is also not a good idea to have your bathroom fans venting moisture laden air up into your ceiling space either as it will lead to condensation and mould problems causing damage to roof framing timber as well as the health aspect. If you have either of these scenarios I would be looking to change them. Stewie Re: Whirly birds 11Feb 12, 2013 12:29 pm Stewie D Quote: It not just heat removal but vent out them cooking smells and moisture from internal exhaust fans from the kitchen and bathrooms. It is also not a good idea to have your bathroom fans venting moisture laden air up into your ceiling space either as it will lead to condensation and mould problems causing damage to roof framing timber as well as the health aspect. If you have either of these scenarios I would be looking to change them. Stewie BTW Australian Building Code Paragraph 3.8.5.0 states: Performance requirement P2.4.5 is satisfied for mechanical ventilation system if it is installed in accordance with AS 1668.2. "Mechanical ventilation for acceptable indoor air quality", except that any contaminated air from a sanitary compartment or bathroom must: (a) Exhaust directly to outside the building by way of ducts; or (b) Exhaust into the roof space provided: It is adequately ventilated by open eaves, and/or roof vents; or The roof is clad in roofing tiles without sarking or similar materials, which would prevent venting through gaps between tiles. As detailed above, in dwellings with a metal roof, or where the roof is lined with sarking, ventilating directly in to the roof space is not permitted by building codes unless the roof space is adequately ventilated by open eaves or roof vents. Like builders ever do ducting to outside unless at additional cost.. Re: Whirly birds 13Feb 12, 2013 2:36 pm Aren't we talking vents in the eaves ? Nothing illegal about this. Re: Whirly birds 15Feb 14, 2013 9:20 pm I have checked up in the ceiling cavity and the entire area is insulated, so I am not sure if that is the issue. Does the insulation have to be of a certain thickness to be effective (whilst I did not measure it it only appears to be about 15 cm thick). Re: Whirly birds 16Feb 16, 2013 5:31 pm We got one in our build and will add another just for that little extra ventilation as well with our higher ceilings. They don't look as bad as they used to - as long as you don't cheap out with one off ebay or something. Kenny & Kayla - Adelaide Follow our build on Instagram First build 2013 - Finished and sold Second build 2018 - Underway Re: Whirly birds 17Feb 16, 2013 6:04 pm Hi We installed 2 pairs of these http://www.universaltileventilators.com.au/index.php?/Product-General/smoothline-corrugated-vent.html Only one is visible from the road, it looks a bit like a bonnet scoop on a Ford GT!! They cost $880 powder coated to roof colour and installed. My Knock down and Rebuild thread viewtopic.php?f=31&t=54685 Our Building Blog http://ourknockdownrebuild.blogspot.com.au/ |