Browse Forums Windows & Doors Re: Double glazing worth the $$ in Perth? 2Sep 29, 2019 8:55 pm Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: Double glazing worth the $$ in Perth? 4Sep 30, 2019 9:53 am Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Double glazing worth the $$ in Perth? 7Sep 30, 2019 6:04 pm Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: Double glazing worth the $$ in Perth? 9Sep 30, 2019 6:55 pm Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: Double glazing worth the $$ in Perth? 11Sep 30, 2019 7:23 pm Alpine environment, I'd be DG'ing all the way. It absolutely makes sense. In Perth. Good design, PV panels and RC AC are going to give you best ROI which I think is what the OP was trying to decide. Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: Double glazing worth the $$ in Perth? 12Oct 04, 2019 12:55 am arcadelt chippy Figures don't lie. You might be misinterpreting me - I'm not necessarily disagreeing, but it’s hard to determine comfort from numbers...and yes, I don’t live in Perth, but a more challenging alpine environment. I agree that generally, it is hard to determine comfort from numbers, but in this case, the numbers are a representation of how much is going to cost you to get your comfort, around 22℃ in my case. In your case, the temperature differences could be as high as 42 (-20℃ to +22℃) which when using my spreadsheet shows savings between $20-33K per year. Based on my numbers and some assumptions I think in the alpine environment, you will have around 10 years ROI, which makes a case for DG windows. I do understand that DG also better block unwanted noise, but in my case, that is not an issue and even if it was it'll be cheaper to use noise cancellation speakers than DG. Re: Double glazing worth the $$ in Perth? 13Oct 04, 2019 8:36 am perth97 In your case, the temperature differences could be as high as 42 (-20℃ to +22℃)... -20°C God I hope not, but yes -10°C to 38°C, so a 48 degree difference. Anyway, all the best with your decision. Re: Double glazing worth the $$ in Perth? 14Oct 04, 2019 3:29 pm It would be great if everybody could have double glazing, but everything comes at a cost, & the cost of double glazing is certainly significant. I'm not expert, but in Perth's climate I'd expect you'd get better value spending your money elsewhere. Upping the (bulk) insulation levels in the roof & walls, reflective insulation in the roof & western wall also. Investing in a good PV system, & look at your hot water options. Investing in energy efficient heating/cooling options (reverse cycle AC), but in Perth a well designed home won't need much. So, as had been mentioned, it's really about the design of the home, & the orientation. Getting that right is free, & will play a major role in comfort & energy efficiency. Glass is such a poor insulator (even double glazing), so the best thing you can do is not overglaze, & make sure all your glass faces the right direction. West facing glass is always going to be a problem, no matter if it's double glazed (which has no effect on radiant heat, sunshine) or low-E glass. If you were going to double glaze you could stick to the southern side of the home. But you shouldn't have overglazed that side, so there shouldn't be too much glazing. Same with low-E glass. You could use it on the west & eastern side, but again you shouldn't have to much glazing here. Especially to the west, hopefully you have no glazing there, or a very minimal amount. Re: Double glazing worth the $$ in Perth? 15Oct 08, 2019 7:48 am We are currently building in Perth as well, a 5x3 2 storey home with Plunkett and we are going double glazing. We have very large casement windows everywhere and our upgrade cost was $36k with Arco. To be honest one of the biggest misconceptions of Perth is that it doesn't get cold and it's a hot place (obviously it is) , but there are in fact more days in a year in which you need a heater on than the air con on and the costs can be huge much more than the aircon. Having lived overseas I was tired of spending my winters in front of the heater and taking a shower in a freezing cold bathroom. Double glazing makes sense to me as I have experienced it, and it's crazy that in almost 2020 they still build houses with single glazed so inefficient. We looked at the E glass option as well, but it wasn't what we were after as our biggest trouble were the cold winter nights and keeping heat in and the Eglass is really only effective for sun and keeping the heat out, whereas obviously double glazed does both. Re: Double glazing worth the $$ in Perth? 16Oct 08, 2019 10:33 pm It's not just the glass though, Australian houses leak like sieves, & are poorly insulated. Double brick seems about the most stupid way to build, & it's all over WA. Especially uninsulated double brick, which was common in the past. My sister has a place like that in Sydney. It's the coldest house I've ever been in, absolutely horrible. Although double glazing would be great, I think you get much better bang for your buck elsewhere first. Upping the insulation, taped wall wrap to cut down on air ingress. Re: Double glazing worth the $$ in Perth? 17Nov 07, 2019 1:37 pm Sorry Dis but I have to disagree with most of your statements. Dis To be honest one of the biggest misconceptions of Perth is that it doesn't get cold and it's a hot place (obviously it is) , but there are in fact more days in a year in which you need a heater on than the air con on and the costs can be huge much more than the aircon. I don't see how you'll need more heating than cooling in Perth, unless you are very sensitive to cold and your comfort temperature is close to 30°C. Perth does get "cold", but it is nothing compared to Europe. I did grow up in Europe and at rare occasions experienced temperatures of -20°C... Let's not compare apples with oranges. Here is data to support my claim: https://www.australia.com/en/facts-and-planning/weather-in-australia/perth-weather.html http://www.farmonlineweather.com.au/climate/station.jsp?lt=site&lc=9225 Heating and cooling costs are more-less the same if you use RC Air Con. KW of energy is KW of energy! Dis Double glazing makes sense to me as I have experienced it, and it's crazy that in almost 2020 they still build houses with single glazed so inefficient. It's not crazy, but it is practical and smart IMO not to spend $$$ on something that doesn't do much anyway. If you look at the calculations I did above you'll see that plain glass it is not so inefficient in Perth climate as a significant part of the year the desired temperature is not much different than the outside temperature. IMO it is crazy to spend $26K++ when doesn't add much of value to your comfort. Extra insulation, solar panels, automated window coverings etc. would be a much smarter way to spend that kind of money, especially if the cost of the house is in a range of $300K. Double (or even triple) glazing in Perth makes sense in few cases.
Dis We looked at the E glass option as well, but it wasn't what we were after as our biggest trouble were the cold winter nights and keeping heat in and the Eglass is really only effective for sun and keeping the heat out, whereas obviously double glazed does both. This is plain wrong. Low E glass affect both thermal and solar efficiency. Happy to be corrected on this by experts! DG doesn't do much for solar heat transfer if you don't use window coverings. See U and SHGS values under the performance section in here https://www.viridianglass.com/products/energy-efficiency/comfortplus Note that plain DG window U value is about 2.7. U-VALUE & SHGC EXPLAINED Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Double glazing worth the $$ in Perth? 18Nov 08, 2019 7:40 pm I'd agree that at the price we pay for double glazing (far higher than overseas I believe), it doesn't usually make financial sense. That money could be better utilised first by upgrading insulation, using wall wrap & draft sealing etc. I'm no expert either, but believe you're right that double glazing has little effect keeping solar radiation (direct sunlight out). However I do think double glazing is far more effective in cold climates than low-e glass. Not that this is Perth Re: Double glazing worth the $$ in Perth? 19Nov 09, 2019 1:18 am Thank you for taking the time to reply to my message. Again as mentioned before our biggest issue, and the reason why we have decided to invest in DG is the cold NOT the heat. Although I'm sure you have experienced temperatures of minus 20° outside, if you have lived in Europe you would know that thanks to central heating and with the help of DG temperatures inside the house rarely go under 19/20°. This is not the case in Perth during winter. Where night temperatures inside the home in winter can drop even lower that 15°. Which to me feels uncomfortably cold. I am from Europe and inside my house I'm used to be comfortable, especially going to the bathroom in the morning. Again if you have grown up in these conditions and are used to battling a cold house during winter months, that's fine, but if you know there is a better reality out there, it's quite hard to make the switch. Re: Double glazing worth the $$ in Perth? 20Nov 09, 2019 7:42 am ddarroch I'd agree that at the price we pay for double glazing (far higher than overseas I believe), it doesn't usually make financial sense. That money could be better utilised first by upgrading insulation, using wall wrap & draft sealing etc. Seems like a bit of a circular problem. Double-glazing would be cheaper if it was ubiquitous, but because it is perceived as too expensive, people aren’t willing to install it, so it will never be widespread. This is one of the reasons I decided to go overseas for my double glazed windows. As the builder indicated, he's worked on many upmarket builds, these were the most well… 13 15089 To validate the certificate, I need to confirm if it aligns with the requirements outlined in AS1288 - 2021 Section 5, clause 5.23.1 & 5.23.3, AS2047-2014 clause 8.1 &… 5 1741 In fairness nobody gave a crap about the ACCC and the gag clauses continued in the pro forma templates of a few other builders after the ACCC took on Wisdom, and more… 20 57365 |