Browse Forums Building A New House Re: who has installed a whirlybird to their roof? 20Dec 09, 2008 10:27 pm Zeek correct - Sisalation does need to be draped and correct many times it is not installed with a sufficient gap - therby reducing it's performance.
Dynamite - Theory from a couple of sources is all well and good - but be careful of the web not being all true and correct :d So as a test of your theories - Grab a section of silver sisalation (I've got new 60 metre roll if you need some) and on a hot day stretch it out over a metre square cardboard box and then measure the temperature inside (shade the sides of the box) Do the same with another box at the same time with sheet of tin and some R3 or 4 insulation and tell which one works best. Then you'll have a bit more measured data of your own - I'd be interested in your results - because my experience and data is not as you propose in your previous threads. As for whirlybirds - I was in the old Perth gaol last weekend and the 1800's gaol has an excellent whirlybird that is a 3 foot diameter fan that vents the entire room through the roof. On a 27 degree day it was naturally spinning with the convected air that was moving through it. The trick with roof ventilation, is to ensure that you are using it to draw air into the house, and venting out through the roof space ensures you create good ventilation, as well as remove the heat from the roofspace. But it's better if the entire house is designed around it - not just an add on. One option for existing houses or non ideal airflow designs is to use a system like the cardiffair. http://www.cardiffair.com.au/index.php?module=pagesetter&func=viewpub&tid=2&pid=1 And these articles explain how whirlybirds and vents or windows can make the house nicer to live in - in summer. http://www.energyarchitecture.com.au/media/21-ada-st-documentary/ http://www.beyondtoday.com.au/pageflip/design_guidelines/design_guidelines.pdf Steve The unit normally clips into a metal plate screwed to the wall, either plate is not flush, or unit not hooked in and could be hanging from the pipes partly, either might… 2 15791 I work with owner, he/she is my man on the ground and I instruct them when to visit the site and take photos and I have other tools in the bag. 4 15276 4 14297 |