Chris
Browse Forums Heating, Cooling & Insulation Re: Is sarking necessary with Colorbond roof? 61Nov 21, 2008 9:43 am Quote: 3 Whirlybirds would have been another $1200, Chris 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 in Perth 62Nov 21, 2008 11:16 am libechacos Definately include a roof vent, and then get a quote from your builder on anticon/air cell or similiar and a quote on reflective foil insulation in the ceiling space What else are you doing to keep your home comfortable without a/c or heaters? Haven't decided on a plan yet, so haven't got it exactly planned yet, but upgrading R4 insulation, basic wall and floor insulation, a light coloured colourbond roof (the white or silver shades), eaves, reducing the size of the windows at the front (our block faces East) and adding a patio along the back for the West side, living areas facing North with eaves, once the house is done, we will put in heavy curtains with pelmets and at a later date when we can afford it, roller shutters, double glazing (if we can afford it), appropriate land scaping (eg. sheltering trees most likely behind the patio on the West, plants below the windows on the North, etc), and a solar hot water system. Re: Is sarking necessary with Colorbond roof? 63Nov 21, 2008 11:46 am kristofw Quote: If I use anticon, is the ventilator worth adding too? Chris Your roof vents won't work unless you also let hot air out of the living space via a ceiling vent. Cooling the roof space in isolation has neglible effect on the living areas below. Its only advantage is to reduce the heat load on any air con ducts in the roof space. The Florida solar energy centre did research on this and showed the effect is about 5% reduction in cooling requirements. If you want to read the physics behind it check out: http://forums.envirotalk.com.au/index.p ... topic=5419 Re: Is sarking necessary with Colorbond roof? 64Nov 21, 2008 9:27 pm Quote: Your roof vents won't work unless you also let hot air out of the living space via a ceiling vent. Cooling the roof space in isolation has neglible effect on the living areas below. Chris My father rode a camel, I drive a car, my son flies in a jetliner, his son will ride a camel.Saudi saying sime tips 65Nov 22, 2008 10:45 am If the heavy drapes and pelmets are to keep the heat out, go shutters instead - they are probably cheaper and will work better.
There is a house in Hobart that costs the owners $1.80 to heat in our long winter - lots of north facing double glazing and good use of thermal mass (no curtains or blinds at all!) The way to keep the heat from your roof is with reflective foil insulation. Enjoy creating a great home! I'll show you how to keep your new home betwen 15 and 26 degrees celcius all year round - in your buget - GUARANTEED! www.sunrisehomes.net.au Re: Is sarking necessary with Colorbond roof? 66Nov 27, 2008 8:24 pm I just stumbled across this topic and am slightly worried
We are having a colorbond roof and I can not see the word sarking anywhere in our contract. We are having insulation in the roof but after reading this it appears to be a different thing. I've sent an email to my builder asking for a please explain and telling them i don't want any damage to my timber beems due to not having sarking which I believe I should have been informed about. Will see what the outcome is My karma ran over your dogma Re: Is sarking necessary with Colorbond roof? 67Nov 27, 2008 8:42 pm Sarking is a completely differnet thing to insulation Bel, I've chosen to included sarking even though we are having tiles. I leave you to fend for yourself, figure things out yourself. Terrence Malick Re: Is sarking necessary with Colorbond roof? 68Nov 27, 2008 8:46 pm Yeah that's what I meant Jo - probably didn't word it well
I got the insulation to keep the heat out/in, and I believe the sarking is to reflect heat/prevent condensation. How much were you charged for sarking? My karma ran over your dogma Re: Is sarking necessary with Colorbond roof? 69Nov 27, 2008 8:52 pm With M it was 2.5k, we have a provisional sum with this builder until we get to pre contract in a couple of weeks. Then I'll have the correct price. I leave you to fend for yourself, figure things out yourself. Terrence Malick Re: Is sarking necessary with Colorbond roof? 71Nov 27, 2008 9:14 pm We have it for all of the normal reasons.... but also just as an extra bushfire protective measure. It was probably unecessary, but our block is near the Northern Hwy and I can see where a fire has gone through.
Being on top of a hill, I thought we may be in the path of flying embers.... I'm probably paranoid, but I think all of the benefits of sarking make it worth it. I leave you to fend for yourself, figure things out yourself. Terrence Malick Re: Is sarking necessary with Colorbond roof? 72Nov 27, 2008 9:30 pm That's what I am thinking....I only wanted it as I have read stories of condensation building up in people's roof spaces and rotting the timber beams so the ceiling collapses
Apparently this can be counteracted with sarking, but if the above was really a possibility you would assume that it has to be standard with colorbond roofs. Our roof will be a light colour and I have heard that helps My karma ran over your dogma Re: Is sarking necessary with Colorbond roof? 73Nov 27, 2008 9:36 pm The other thing is it helps stop dust and crap building up in your roof cavity.... remember Michelle's pics of roof cavities from a while back?
Honestly Bel, I think you should push for it. There's no reason they can't do it. And remember it's not really something you can do later. I don't think you'll regret it. I leave you to fend for yourself, figure things out yourself. Terrence Malick Re: Is sarking necessary with Colorbond roof? 74Nov 27, 2008 10:09 pm haywgl Apparently this can be counteracted with sarking, but if the above was really a possibility you would assume that it has to be standard with colorbond roofs. Our roof will be a light colour and I have heard that helps Technically sarking is any form of vapour or water barrier. It's purpose is to provide a drainage plane for leaks or condensation and to reduce water vapour penetrating into the building envelope. It can be a plastic sheet or even layers of waterproofed plywood or felt Water is usually directed towards the gutter. Sisalation is a brand name for a reflective foil laminate which acts as a radiant barrier and can be also used as sarking. Sarking in itself won't guarantee against condensation. The key to good moisture control is to prevent warm air infiltrating into a cold cavity and condensing on its surface. Therefore one should: 1) Ensure that the conditioned space is well sealed from the roof space, wall cavity and exterior atmosphere 2) Prevent cold surfaces forming on interior cladding and ceiling with bulk insulation 3) Allow trapped moisture in the wall cavity to move out by using a breathable, water permeable cladding Re: Is sarking necessary with Colorbond roof? 75Nov 28, 2008 10:08 am Thanks guys
Just heard back from my CSC and sarking is included in the price for the colorbond roof so we will be having it at no extra cost Great news! My karma ran over your dogma Re: Is sarking necessary with Colorbond roof? 76Feb 28, 2009 10:36 am Hi guys,
Everyone here seems so helpful so I just thought I would post this here not sure if it has been covered or not. I would like to find out if sarking or something similar is required to get a 5 star energy rating for a single storey house with a Colorbond roof, the ceiling insulation will be 4.0 any help would be appreciated. Thanks Daniel Re: Is sarking necessary with Colorbond roof? 77Mar 02, 2009 9:28 am You may not need it to reach 5 stars, depending on the rest of the house and glazing etc, but it will improve comfort of the house in summer I'll show you how to keep your new home betwen 15 and 26 degrees celcius all year round - in your buget - GUARANTEED! www.sunrisehomes.net.au Re: Is sarking necessary with Colorbond roof? 79Apr 24, 2009 12:16 am I also have color bond. Not sure If sarking is included as standard. If not, I may go with other forms of roof vents. Ive go 450mm eaves. Is there any form of vents that can be put in under the eaves to vent the roof ?. Would the roof insulation go out into the eveas, should it? Any ideas on roof venting via eaves? Thanks KW “It's just as unpleasant to get more than you bargain for as to get less” George Bernard Shaw. Re: Is sarking necessary with Colorbond roof? 80Apr 24, 2009 7:13 pm Anti-con is mandatory under metal roofs in NSW. 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 11714 Currently renovating, and our main lounge is 5m x 10m, with a cathedral roof peaking at 6.5m high. Currently have tiles on concrete slab. Room is very hard to heat. I am… 0 4820 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 10209 |