Browse Forums Eco Living 1 Nov 23, 2008 1:56 am Hello,
I'm interested in roof ventilators that are thermostatically controlled and, ideally, unpowered. Does anybody have any experience with these? I live in Perth, so we have hot dry summers and cool wet winters. I know the standard whirlybirds would remove heat very efficiently, but as I understand it, they work whenever there is a breeze so would also remove heat in winter, when I'd want to retain it. I've found a little bit of information on thermostatically controlled vents, but would like to hear from anyone who has viewed or installed one. I'd be grateful for any advice! Re: roof ventillation 3Nov 23, 2008 11:25 am My father rode a camel, I drive a car, my son flies in a jetliner, his son will ride a camel.Saudi saying Re: roof ventillation 5Dec 02, 2008 7:55 am The auto one had an issue many years ago with ot closing off or not opening due to the bi-metal flaps ceasing up on the hinges or the metal not bending as much as it used to.
If you vented the room to ceiling you need to make sure you are getting cooler air into the house to make it effective. Steve Re: roof ventillation 6Jan 08, 2009 1:00 am Hi OllyB,
The Sustainable Mandurah Home has ecovents. From what I can remember they are thermostatically controlled. The home is open for display and has a guide who can tell you about the features. We found it really interesting.[url]www.sustainablemandurah.com.au/ Sonya Re: roof ventillation 7Jan 08, 2009 1:44 am kristofw was considering some eco- vents. He's in Perth.
He said they were$199 inc GST in ALU finish and $256 painted to matching colour' http://www.mbrsheet.com.au/eco_ventilation.htm If you get them let me know how well they work as we are considering them as well. Re: roof ventillation 8Jan 08, 2009 10:43 am kexkez kristofw was considering some eco- vents. He's in Perth. He said they were$199 inc GST in ALU finish and $256 painted to matching colour' http://www.mbrsheet.com.au/eco_ventilation.htm If you get them let me know how well they work as we are considering them as well. Ventilating the roof space will have neglible effect on the living space below. You will need to ventilate the living space directly. The thing that will make the most difference is putting reflective foil under the roof. From the Your Home technical manual: http://www.yourhome.gov.au/technical/fs13.html "Myth: Roof ventilators will keep your house significantly cooler. Fact: Roof ventilators do not make an appreciable difference to house temperatures if the roof is insulated, particularly if reflective insulation is installed. If your ceiling is uninsulated a ventilator might make a small difference, but insulation is a better investment. There may, however, be other valid reasons for installing roof ventilators such as moisture removal." Re: roof ventillation 9Jan 08, 2009 10:50 am dymonite69 Ventilating the roof space will have neglible effect on the living space below. You will need to ventilate the living space directly. I am guessing you mean directly to the outside, not into the roof space? As ventilating your ceiling into your hot roof space will have a negative effect if it is two way and no effect if it is one way. I was in my roof space at the weekend - with steel trusses that I could not hold my hand on for more than 1 second... so the temperature was greater than 70 deg... but my living space was fine with evap a/c. Ed Re: roof ventillation 10Jan 08, 2009 11:12 am EcoClassic I am guessing you mean directly to the outside, not into the roof space? As ventilating your ceiling into your hot roof space will have a negative effect if it is two way and no effect if it is one way. You need communication between from the ceiling space to top of roof outside. This can occur with a seperate ceiling vent and roof vent or just a duct directly from living area to the roof vent. The natural effect of rising heat helps assist the movement of air. At the same time you will need to have source of cool fresh air at ground level to replace the exhausting hot air. If the living space was connected with an airtight roof space than nothing would happen. However, the hot air in the roof should stay up there as long there wasn't a pressure gradient in that direction. Thank you Pulse, I thought we did the right things; external shutters on all windows down all day, west side of the house nearly completely in the shadow of the large two… 6 25117 2 7937 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 21986 |