Browse Forums Heating, Cooling & Insulation 1 Nov 12, 2009 3:30 pm I came across this recently, and seriously considering having it installed with my new build if possible. http://www.ais-group.com.au/homeinsulation/products/cavitywall/cavitywallinsulationbrochure.pdf Has anyone here (in WA) used this, and what are your thoughts on it? How much would it cost on average for a 200sqm single storey house? Is it better to have it installed during construction, or is it still ok to have it done after handover if my builder doesn't allow it to be installed during construction? 12 March 2010 - Land titles received 3 April 2010 - Signed building contract 14 April 2010 - Prestart 28 April 2010 - Loan approved 30 June 2010 - Slab completed 27 August 2010 - Brickwork completed 22 September 2010 - Roofing completed 30 September 2010 - Internal walls plastered 12 October 2010 - Lock Up 19 November 2010 - PCI 26 November 2010 - Handover 29 December 2010 - Moved In https://forum.homeone.com.au/viewtopic.php?f=31&t=32584 Re: Double brick cavity wall insulation - advise needed 2Nov 12, 2009 7:15 pm Don't use this for a new build. Use Air Cell Insulbrake 80. You don't want to totally fill your cavity. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Double brick cavity wall insulation - advise needed 3Nov 13, 2009 10:59 am How come Casa2? Whats the reason of not filling up the cavity entirely? 12 March 2010 - Land titles received 3 April 2010 - Signed building contract 14 April 2010 - Prestart 28 April 2010 - Loan approved 30 June 2010 - Slab completed 27 August 2010 - Brickwork completed 22 September 2010 - Roofing completed 30 September 2010 - Internal walls plastered 12 October 2010 - Lock Up 19 November 2010 - PCI 26 November 2010 - Handover 29 December 2010 - Moved In https://forum.homeone.com.au/viewtopic.php?f=31&t=32584 Re: Double brick cavity wall insulation - advise needed 4Dec 13, 2009 1:14 pm aLLaNNa1 I came across this recently, and seriously considering having it installed with my new build if possible. http://www.ais-group.com.au/homeinsulation/products/cavitywall/cavitywallinsulationbrochure.pdf Has anyone here (in WA) used this, and what are your thoughts on it? How much would it cost on average for a 200sqm single storey house? Is it better to have it installed during construction, or is it still ok to have it done after handover if my builder doesn't allow it to be installed during construction? Definitely easier during construction, my supervisor was willing to let me go ballistic with extra insulation but I'm not at all convinced I did the right thing. On reasonably hot days we don't need air-conditioning and our house is definitely cooler than most. But on very hot days a lot of heat is transmitted through the windows and whatever else and we get overpowered by heat, then all those glorious bricks and insulation ensure the heat is trapped. We absolutely fry and cannot function on 3 hours sleep. Now we're getting air-conditioning after all, it's post build which isn't idea but we really don't have a choice. I figure double brick is already a decent insulator so you'll need air-con for less days in the year BUT you'll still need it for times when you get overpowered. If you want to limit the air-con usage then consider the windows, not the double bricks. Heavy tinting, awnings, shutters ... Re: Double brick cavity wall insulation - advise needed 5Jan 28, 2012 5:20 pm I am in Sydney building a double brick home. My builder says that wall insulation is not required and double brick with the cavity built on the concrete slab should be comfortable. Does anyone agree or disagree with this and also knows if this even complies with the Building Codes? I am considering a product like AIR-CELL Permicav but am unsure if this added expense is really necessary. http://www.kingspaninsulation.com.au/Pr ... rview.aspx Re: Double brick cavity wall insulation - advise needed 6Jan 28, 2012 10:59 pm I've built a full brick house in Sydney and Basix required cavity insulation, so I had no choice. Basix may have changed over the past 2 years. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Double brick cavity wall insulation - advise needed 7Feb 01, 2012 8:24 am In my opinion it would not be necessary to insulate a cavity brick wall with bulk insulation, I maybe wrong but I think a 50mm trapped air cavity would give you approx. R1.0. You might be served well with the use of a foil membrane(sarking) this would act as a moisture barrier and perhaps give some radiated heat R value also. Johny rox Re: Double brick cavity wall insulation - advise needed 8Feb 01, 2012 9:22 am How are you meant to install sarking on a double brick wall. There is no way to get in in there? Or cut around all the brick ties. You could put sarking if you were going to veneer the inside wall with another air gap. Re: Double brick cavity wall insulation - advise needed 9Feb 01, 2012 11:44 am james_d How are you meant to install sarking on a double brick wall. There is no way to get in in there? Or cut around all the brick ties. You could put sarking if you were going to veneer the inside wall with another air gap. It's done during the build. Pushed over the brick ties with spacers placed first. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Double brick cavity wall insulation - advise needed 10Feb 01, 2012 2:21 pm Casa2 james_d How are you meant to install sarking on a double brick wall. There is no way to get in in there? Or cut around all the brick ties. You could put sarking if you were going to veneer the inside wall with another air gap. It's done during the build. Pushed over the brick ties with spacers placed first. Hmmm, never seen that! Must be very cooperative brickies. Re: Double brick cavity wall insulation - advise needed 11Feb 01, 2012 7:52 pm james_d Casa2 james_d How are you meant to install sarking on a double brick wall. There is no way to get in in there? Or cut around all the brick ties. You could put sarking if you were going to veneer the inside wall with another air gap. It's done during the build. Pushed over the brick ties with spacers placed first. Hmmm, never seen that! Must be very cooperative brickies. It's standard in Sydney. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Double brick cavity wall insulation - advise needed 12Feb 22, 2012 10:30 am Quote: Don't use this for a new build. Use Air Cell Insulbrake 80. You don't want to totally fill your cavity. That is for a brick veneer wall Casa2. Alan needs something like the Kingspan AIR-CELL Permicav http://www.kingspaninsulation.com.au/Pr ... rview.aspx Seems ideal but I'd like to know how much it's worth. You would also need to lay half of the height of one wall first , install the permicav, then lay the other wall. You would also need to "supervise" the brickies to make sure they didn't trash the insulation by ripping it excessively with the brick ties. Seems like it is about $22 per sq m which isn't cheap and would add probably $4-5,000 to most new homes. It would however increase the R-value of the wall by 2.0 ( summer ) to 2.1 ( winter ) which is a pretty good result. Stewie Re: Double brick cavity wall insulation - advise needed 13May 29, 2013 11:48 am Stewie D .......Kingspan AIR-CELL Permicav http://www.kingspaninsulation.com.au/Pr ... rview.aspx : Seems like it is about $22 per sq m which isn't cheap and would add probably $4-5,000 to most new homes...... Stewie Closer to $9.00 / square meter (supply). P_D . Block settled 07 June 2011 Our little piece of the Interwebs on HomeOne....... viewtopic.php?f=31&t=48577&start=0 Re: Double brick cavity wall insulation - advise needed 14May 30, 2013 9:51 am Quote: Seems like it is about $22 per sq m That's what I was quoted for supply and install by a Permicav distributor. If you do it yourself then sure $9 per sq m is what it should cost for supply only. Stewie Re: Double brick cavity wall insulation - advise needed 15May 30, 2013 10:19 am I am not convinced that double brick wall cavity insulation is ever really required or desirable. Firstly it will interfere with cavity drainage and ventilation and secondly the money is better spent on upgrading windows. Thermal performance of your home is a sum total of all the elements and to be efficient it must be balanced. Unbalanced design means it will be like Titanic with a big gash in the side, it will sink your heating and cooling budget. There is no point in extra insulation of walls if your windows and doors are a bottomless pit of heat loss or gain. I see this all the time on my inspections where we always scan walls and ceilings with thermal imaging camera. If your house requires double brick wall insulation in cavity that would alert me , Why? I would be questioning your design, more than likely it is not balanced. Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Double brick cavity wall insulation - advise needed 16May 30, 2013 10:28 am To be honest I wouldn't be building a double brick home to start with. It is quite poor thermally and you can achieve much higher R-values with a brick veneer house. Stewie Re: Double brick cavity wall insulation - advise needed 17May 30, 2013 10:49 am building-expert I am not convinced that double brick wall cavity insulation is ever really required or desirable..... We're about to start building a brick veneer home, and are making it as energy efficient as possible with (batt) insulation in the external walls. Would you also use some sort of reflective shield such as this or (wall) Sisalation ? Our windows are already double-glazed, with Low-e glass on the two front (west) windows. Thanks, P_D . Block settled 07 June 2011 Our little piece of the Interwebs on HomeOne....... viewtopic.php?f=31&t=48577&start=0 Re: Double brick cavity wall insulation - advise needed 18May 30, 2013 1:16 pm I'd use sisalation as a minimum depending on how well insulated you want your walls. Just do the maths regarding cost/benefit ratio with the total R-value of your walls as your guide. Here is what we have planned for our place or something close anyway. This is despite living in quite a temperate place on the Northern Beaches where winter temps rarely gets down below 8º C and summer rarely above 32ºC. We may go for ecobricks on the outside and not go for the cavity foam. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Now compare this to a double brick wall which struggles to achieve R2.0 Stewie Re: Double brick cavity wall insulation - advise needed 19May 30, 2013 3:13 pm Interesting detail Stewie but the wall is built up to 330mm from standard 250 for BV, you will loose 80mm of usable floor space ) all around (rough calc 4m2 for 15Mx10M house) and you will need extra wide reveals for windows. For a temperate climate R4.88 it's probably overkill but it's OK if that is what you want, it comes down to personal preference. If you were to use Hebel bricks you would not need that much insulation and may save floor space and may get nicer drapes instead. What is the R value of your double glazed windows? Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Double brick cavity wall insulation - advise needed 20May 30, 2013 9:16 pm We've got a few variations on this but are probably looking at a wall thickness of around 300mm with an R value of about 4.0 - more than adequate for our climate. All up we will lose 50mm off the outside edge of each room compared to 250mm BV which in my book isn't worth worrying about. We will probably also use an ecoblock - similar to Hebel. Haven't got to the windows yet but are looking at something around R 0.5 from memory. Stewie Building Standards; Getting It Right! Long story short, a toilet room is going to back onto our main bedroom and I want to make it close to soundproof. 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