Browse Forums Eco Living 1 Jun 01, 2008 10:08 pm We are building in Perth WA and are considering our options to install energy saving (and hopefully in the long term money saving) measures. Ceiling insulation is a definite but is it worth installing cavity wall insulation and the under roof tile insulation blankets too? How much of a difference does it really make to the internal environment? Has anyone installed either of these recently and has an opinion?
Re: Wall Insulation and Under Tile Insulation Blankets? 2Jun 02, 2008 7:49 pm It all helps housewa.
When you say walls - you mean external or internal walls? Having under roof as well as ceiling insulation is of course better, but the bang for buck is debatable - where in WA are you - how cold is the area is what is used to calcutlate the main gains of extra ceiling insulation and external wall insulation levels. Steve Re: Wall Insulation and Under Tile Insulation Blankets? 3Jun 02, 2008 8:19 pm hi depending on where you are building some councils are now requiring external walls to be insulated. Yes in double brick.. yes even teh wall between a living area and a garage. sigh darn original plan draft this was forgotten so we've got another walls worth of insulation to be added to building cost. grumble grumble. we are building in a zone 6 area and have to have it. But I'm not sure that you would get that much value from it in the "burbs. Re: Wall Insulation and Under Tile Insulation Blankets? 4Jun 02, 2008 11:02 pm Quote: hi depending on where you are building some councils are now requiring external walls to be insulated. Yes in double brick.. yes even teh wall between a living area and a garage. sigh darn original plan draft this was forgotten so we've got another walls worth of insulation to be added to building cost. grumble grumble. we are building in a zone 6 area and have to have it. But I'm not sure that you would get that much value from it in the "burbs. Sure does Kexkez. External walls - even to an internal garage looses lots of heat. I was told a figure that only 5% of non insulated area (ie a ceiling) will reduce the actual performance of your insulations benefits by as much as 50%. Yes 5% of a non insulated ceiling area, can make your R3.5 ceiling insulation perform like it is only R1.75 Why - well the warm air will constantly move across the area that is not insulated 'with its own high speed mini draft in that area, so it is constantly loosing or gaining heat where it is not insulated. And doing external walls really helps with this as well. The convection process of an externally exposed brick wall in winter constantly cools the plasterboard near it and in summer it's the opposite. Which is why reverse brick houses is actually better - as the thermal mass does not change as much day and night through winter and summer. Steve Wall Insulation & Under Tile Blankets 5Jun 03, 2008 11:46 am Thanks for the replies. We are in Zone 5 (slightly inland of Rockingham) I think and I visited the Home/Sustainability show at the Perth Convention Centre on the weekend - got some information from the SEDO display which has helped heaps. It seems in Zone 5 wall insulation is not required but your comments were valid so will get some pricing from suppliers anyway. I guess I meant external wall insulation - the cavity bit between the exterior wall and the internal wall on a double brick construction, rather a technical description I know!!!!!!
Re: Wall Insulation and Under Tile Insulation Blankets? 6Jun 04, 2008 7:19 pm Quote: the cavity bit between the exterior wall and the internal wall on a double brick construction, rather a technical description I know!!!!!! Cold outside versus warm inside = The most important bit. Re: Wall Insulation and Under Tile Insulation Blankets? 7Jun 25, 2008 8:52 pm Im guessing that the double brick wall is two brick walls inner and outer seperated by an air gap? If so having insulation in that gap won't really do anything and its enforcement is another local council incompetency. All insulation batts do is trap air pockets doing this in an air pocket dos'nt really make sense. See if they will let you get away with sissalation paper its about r1.5 but it will stop moisture which at least is helpful.
As for house3wa's questions It works out cheaper just to upgrade the roof insulation to r4 - r4.5 than to install the insulation blankets they really won't do that much unless you go for colorbond. The wall insulation will make a huge difference and it also cuts out external noise. Look at double glazing to complete the picture. Building NB Hampton 19e finishing at end july 08 Re: Wall Insulation and Under Tile Insulation Blankets? 8Jun 25, 2008 9:12 pm Quote: m guessing that the double brick wall is two brick walls inner and outer seperated by an air gap? If so having insulation in that gap won't really do anything and its enforcement is another local council incompetency. All insulation batts do is trap air pockets doing this in an air pocket dos'nt really make sense. See if they will let you get away with sissalation paper its about r1.5 but it will stop moisture which at least is helpful. What it wil do Newbie is stop the convection prcess between the outer brick and the inner brick. If you are warming up the inside bricks with a space heater and the cold outside air between the bricks is actively convecting the inside bricks that are being warmed up over many days during winter - it will make a difference if that inside layer of brick is properly insulated from any cold air movement against them. Sisilation unless sealed off to create an airtight section does not effectively do this. This artcle explains it in more detail. Steve Re: Wall Insulation and Under Tile Insulation Blankets? 9Jun 25, 2008 10:44 pm newbie74 All insulation batts do is trap air pockets doing this in an air pocket dos'nt really make sense. Currently living in a double brick place with no wall insulation, and believe me the double brick wall has very little insulation value (R=0.5 compared to R=0.4 for brick veneer). OK, I know we're in Tassie, but one of the issues I have with it is the retention of heat after several warm/hot days in a row which would surely be more of an issue in WA. Insulation would help prevent the internal brick walls heating up as well as keeping them warmer in winter. 'chelle We have a hand-over date...15/10...but I won't hold my breath! http://people-in-glass-houses.blogspot.com/ Re: Wall Insulation and Under Tile Insulation Blankets? 10Jun 26, 2008 1:29 pm I get constantly frustrated by posts from people that obviously know jack shyte about what they are posting.
Yak_Chat knows his stuff. Read his replies & take it in - it's good info. Peter Clarkson - AusDesign Australia www.ausdesign.com.au This information is intended to provide general information only. It does not purport to be a comprehensive advice. Re: Wall Insulation and Under Tile Insulation Blankets? 11Jun 29, 2008 11:04 pm Calm down idiot, I work as an engineer. Having double brick walls with an air gap is an incredibly effective insulator its used in several areas across Canada and elsewhere. The walls have to built on a slab and sealed at the top. The air has to be trapped, its exactly the same as double glazing. Here in Aus our construction methods are still far behind whats acceptable o/s. as you should know. Building NB Hampton 19e finishing at end july 08 Re: Wall Insulation and Under Tile Insulation Blankets? 12Jun 30, 2008 11:51 pm Is that still the practice Newbie?
My candian builder friend who has recently moved to OZ has just sealed and taped his underfloor area, as well as installed insulation into the space. Like he used to do in Canada. This article also suggest a different point of view. Agreed steel and brick, not double brick. Sometimes codes change. As they really do need to do yet in OZ. http://www.cmhc-schl.gc.ca/publications/en/rh-pr/tech/96211.htm Re: Wall Insulation and Under Tile Insulation Blankets? 13Jul 01, 2008 12:46 am All insulation material does is trap air and its the air that insulates, its written on the batts packaging as well. Having an air tight cavity is not nessecary, all you have to do is stop the air movement. There is a problem with steel stud walls rusting, having them airtight would stop moisture.
The people who have been claiming that the double brick is not working, do you have proper roof insulation and double glazing? If not this is what is letting out your heat. Another problem is the sealing around the window frames. Yes they are still constructed like this but i have seen some of the newer ones use inner walls made from the same material they use for cool rooms - the plastic coated polystyrene. Someone claiming to have 25 years experience in house design and energy rating accreditation should know how insulation works. Building NB Hampton 19e finishing at end july 08 Thanks for the insights, that makes perfect sense, and yeah, I will be leaning on the experience of the excavator operator entirely. 6 16147 Yeah my reasoning is just that those house posts are designed for vertical load not lateral. I just didnt want to risk interfering with the existing house… 4 11540 Hi all, Just wondering if anyone had suggestions on installing/replacing wall insulation on an external wall which doesn't have wrap, our miners cottage being constructed… 0 4942 |