Browse Forums Heating, Cooling & Insulation 1 Apr 10, 2009 6:30 pm I've just completed an estimate for a perfect insulation for the house I'm owner-building. here's the break-out: Ceiling: 171m2, R5 Pink Batts - $2530 External Walls: 145m2, CSR Rockwool Batts - $2700 External Walls Wrap: 145m2, Air-Cell Glareshield - $1276 Internal Walls: 72m2, Tontine Accoustic Polyester Batts - $580 Colorbond Rood Blanket: 220m2, Bradford Anticon 100 - $2365 Total: $9451! Ouch!!!! It's not easy to be green For a less than perfect insulation I would have to climb down to R4 for ceiling, Glasswool instead of rockwool for the walls, Sisalation instead of Glareshield and Anticon 55 for the roof. That would bring the cost down to the mere $6500. I'm just wondering if the effect these higher ratings are really worth $3000. 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: Cost of perfect insulation??! 2Apr 10, 2009 10:55 pm There is a diminishing law of returns for insulation. http://www.members.optusnet.com.au/fric ... enefit.pdf There is no such thing as 'perfect insulation'. It would have to be infinitely thick for that to happen. Re: Cost of perfect insulation??! 3Apr 11, 2009 1:53 pm Quote: There is no such thing as 'perfect insulation'. True! I should've put it as "the best bang for buck for this project" 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: Cost of perfect insulation??! 4Apr 12, 2009 10:37 am dymonite69 There is a diminishing law of returns for insulation. http://www.members.optusnet.com.au/fric ... enefit.pdf There is no such thing as 'perfect insulation'. It would have to be infinitely thick for that to happen. How thick is a vacuum? "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Cost of perfect insulation??! 5Apr 12, 2009 10:52 am Hi Chris You left out windows... Single glazed windows of U value say 8 on a 10 degree ambient temperature difference, external to internal, would add 5 times the heat loss (4000 watts) of your well insulated ceilings and walls (around 800 watts). Where double glazed windows of U value say 3 would more than half that (1500 watts). (I assumed 50 m2 of windows.) Windows are holes in the walls... Ed "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Cost of perfect insulation??! 6Apr 12, 2009 1:00 pm Ed, I've left out the windows, 'cause I've got that sorted out. They're paid for, in a container, somewhere between Gibraltar and Suez, getting closer every day . I just hope they don't get hijacked by those pirates! 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: Cost of perfect insulation??! 7Apr 12, 2009 5:18 pm ed @ EcoClassic Hi Chris Windows are holes in the walls... What is the 'perfect' insulated window? Re: Cost of perfect insulation??! 8Apr 12, 2009 5:59 pm Quote: What is the 'perfect' insulated window? Easy!! Double or triple glazing, with 90-95% vacuum in between, smart, light in weight glass letting through infrared when it's needed and blocking it otherwise, in a R10 frame. All that cheap to produce, easy to install and control. The only problem is that they don't exist commercially 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: Cost of perfect insulation??! 9Apr 12, 2009 6:28 pm dymonite69 What is the 'perfect' insulated window? kristofw Double or triple glazing, with 90-95% vacuum in between, smart, light in weight glass letting through infrared when it's needed and blocking it otherwise, in a R10 frame. All that cheap to produce, easy to install and control. The only problem is that they don't exist commercially Cheap to make but not cheap to buy which does not fit into your statement below. kristofw I should've put it as "the best bang for buck for this project" BTW no window is perfectly infra-red opaque i.e. a radiant heat barrier. Re: Cost of perfect insulation??! 10Apr 12, 2009 8:20 pm dymonite69 ed @ EcoClassic Hi Chris Windows are holes in the walls... What is the 'perfect' insulated window? As Chris says, the perfect insulated anything is a vacuum. Not a Kirby of course. And Low-E is the ideal IR heat barrier. Ed "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Cost of perfect insulation??! 11Apr 12, 2009 9:28 pm kristofw Easy!! Double or triple glazing, with 90-95% vacuum in between, smart, light in weight glass letting through infrared when it's needed and blocking it otherwise, in a R10 frame. All that cheap to produce, easy to install and control. The only problem is that they don't exist commercially Chris They do... "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Cost of perfect insulation??! 12Apr 12, 2009 10:04 pm ed @ EcoClassic dymonite69 ed @ EcoClassic Hi Chris the perfect insulated anything is a vacuum. Then I wonder how I get so warm in summer when those sun rays pass through the 146000 km of vacuum in outer space. Re: Cost of perfect insulation??! 13Apr 12, 2009 10:07 pm ed @ EcoClassic And Low-E is the ideal IR heat barrier. Depends on what you mean by this but a reflective tint probably would have a far lower SHGC - but never 0%. Re: Cost of perfect insulation??! 14Apr 13, 2009 8:34 am dymonite69 Then I wonder how I get so warm in summer when those sun rays pass through the 146000 km of vacuum in outer space. Insulation or isolation? I think you left off the 000s "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Cost of perfect insulation??! 15Apr 13, 2009 8:35 am dymonite69 ed @ EcoClassic And Low-E is the ideal IR heat barrier. Depends on what you mean by this but a reflective tint probably would have a far lower SHGC - but never 0%. Depends why you have a window - light is one reason... hence Low-E "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Cost of perfect insulation??! 16Apr 13, 2009 9:57 am ed @ EcoClassic dymonite69 Then I wonder how I get so warm in summer when those sun rays pass through the 146000 km of vacuum in outer space. Insulation or isolation? I think the original question in the thread was about insulating the walls. dymonite69 There is no such thing as 'perfect insulation'. It would have to be infinitely thick for that to happen. ed @ EcoClassic How thick is a vacuum? A vacuum in the wall cavity still won't prevent heat getting in. Re: Cost of perfect insulation??! 17Apr 13, 2009 10:21 am ed @ EcoClassic Depends why you have a window - light is one reason... hence Low-E What about eaves, verandahs, pergolas and shade-cloths. They keep the direct sunlight and weather of the walls and are a nice place to sit outside. Re: Cost of perfect insulation??! 18Apr 13, 2009 4:36 pm dymonite69 ed @ EcoClassic dymonite69 Then I wonder how I get so warm in summer when those sun rays pass through the 146000 km of vacuum in outer space. Insulation or isolation? I think the original question in the thread was about insulating the walls. dymonite69 There is no such thing as 'perfect insulation'. It would have to be infinitely thick for that to happen. ed @ EcoClassic How thick is a vacuum? A vacuum in the wall cavity still won't prevent heat getting in. "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Cost of perfect insulation??! 19Apr 13, 2009 4:37 pm dymonite69 ed @ EcoClassic Depends why you have a window - light is one reason... hence Low-E What about eaves, verandahs, pergolas and shade-cloths. They keep the direct sunlight and weather of the walls and are a nice place to sit outside. And the light... Oh just use the light switch... "ECOECO" At 'EcoEco', we design windows, we design the best windows, we do it for you, so that when you’re happy we are happy. Tel. 1800 326 326 Re: Cost of perfect insulation??! 20Apr 13, 2009 6:08 pm dymonite69 What about eaves, verandahs, pergolas and shade-cloths. They keep the direct sunlight and weather of the walls and are a nice place to sit outside. ed @ EcoClassic And the light... Oh just use the light switch... Not really. Our house has huge north facing windows with 450mm eaves. In summer, the eaves are enough to prevent direct sunlight entering the house, yet it is wonderfully bright and cool inside. The air temperature at this time is 9 degrees lower than outside. No magic window coatings, no lights on, no air con required - just good design. We used a smaller qld builder who went bankrupt about 12 months after completion of ours. It was a shame as they were good and relatively cheap and I would have used… 3 5779 Hey guys building a new place through a volume builder and just wondering if i should complain to the site supervisor as we just had plasterboard installed. Looks like… 0 11874 1000000% definitely add insulation. I have in my home and it makes a big difference minimising sound transfer. Insulation is pretty cheap and definitely worth it 2 6810 |