Browse Forums Windows & Doors 1 Sep 02, 2015 12:14 pm Hi. I'm building a new house soon, and was looking at the option of double glazing. It's only a small house. North and East are road facing, and fairly close to the road, too. I am new to double glazing, and some quick researching suggest that there are many different forms of double glazing too. House hasn't been built get, and there may still be some little changes to the plan - considering changing the 4 1800x750 windows into 2 1800x1800approx windows instead. What would you reccomend in the way of double glazing and, as a guide, what would the cost be? Luke http://docdro.id/AKdMeDp Windows are as below Mark Height Width Description Frame Lintels Masonary Lintels 1 1800 750 Alum. awning window 120 x 45 MGP10 85 x 8 Flat Bar 2 1800 750 Alum. awning window 120 x 45 MGP10 85 x 8 Flat Bar 3 1800 750 Alum. awning window 120 x 45 MGP10 85 x 8 Flat Bar 4 1800 750 Alum. awning window 120 x 45 MGP10 85 x 8 Flat Bar 5 1800 910 Alum. awning window ** 120 x 45 MGP10 85 x 8 Flat Bar 6 1800 1810 Alum. awning window 200 x 36 LVL Hyspan 100 x 100 x 6 Galintel 7 600 610 Alum. sliding window ** 90 x 45 MGP10 85 x 8 Flat Bar 8 1200 2110 Alum. sliding window 200 x 36 LVL Hyspan 100 x 100 x 6 Galintel Re: Double Glazing cost and advice 2Sep 02, 2015 2:26 pm all depends on whether you are custom or volume building. custom, you can put in proper thremally broken, low emisvity double glazed windows. I would recomend these. Expensive though. Like very expensive. Volume wise, a lot of volume builders now include double glazed windows as standard. Although these arent thermaly broken and the glass is standard plain glass. So to the uninitiated, this looks like a great deal, and it is better than standard single glazing, but its a far cry from the premium most efficient type you can get. if you are using a volume builder, dont expect them to have any other oprtions, even for an upgrade. Theyre buying in bulk to utilise their buying power, and getting propper thermaly broken frames with low e glass is probably out of the question. Replacing these after the fact with the ones mentioned above would be even more costly. Long stroy short. If youre custome building, go for it, get the good stuff. you wont regret it. If youre going volume builder, just get their standard ther offering. if theyre not offering double glazing as standard, considder the nominal upgrade cost or point them to other builders who use it as standard and negotiate form there Creator of superduperonium, expert at expert things, nobel laureate, can hold my breath for 10 minutes. Re: Double Glazing cost and advice 3Sep 02, 2015 3:28 pm Hi. It is being custom built., and I still have time to make changes to the plan if needed. Also, what do you call very expensive? I've seen a very wide range of prices thrown about when looking, it is hard to get a strong gauge in what very expensive is. Re: Double Glazing cost and advice 4Sep 02, 2015 4:45 pm Luke B Hi. It is being custom built., and I still have time to make changes to the plan if needed. Also, what do you call very expensive? I've seen a very wide range of prices thrown about when looking, it is hard to get a strong gauge in what very expensive is. expensive is approx a 100-150% premium on the non thermaly broken, low e variants, depending on a number of factors such as origin, materials, inert gass filled or not etc. The actual figure is hard to determine, and probably why you cant find a specific price, is because window frames of this type need to be ordered and made (generally), the "standard" ones are all usually prefab to a range of sizes from my understanding. Youll get more accurate figures fto cost rom manufacturers if you specify the size, the features and materials you require. Creator of superduperonium, expert at expert things, nobel laureate, can hold my breath for 10 minutes. Re: Double Glazing cost and advice 5Sep 03, 2015 10:13 am Based on our house, very roughly it was about $140/m2 extra from the single glazed windows with U value 7 to a basic double glazed with a U value of about 4 You have about 13m2 of glass, so you'd expect somewhere around the $2000 mark to go double glazed instead of single. You can consider the economic case for doing the upgrades. When you are using air-conditioning, you can estimate the difference in the energy costs for different windows as the U value gives you the number of watts per square metre per degree of conducted energy transfer. So if a hot day averages about 12 hours at an average of 15 degrees difference between inside and outside, over 13m2 of windows of U value 7, with electricity costing $0.32/kWh driving an A/C of EER 3.5, then the cooling cost to cover the windows is 12*15*13*7*0.32/1000/3.5 = $1.50 a day To pull a number out of the air, say you need an average of this thermal load for 80 days a year, then that's $120 a year of standard single glazing. If you go up to double glazing with U value of 4, then it comes to $69, or $43 for better double glazing of U 2.5. So on these assumptions you get a saving of $51 a year in going double glazing, and a further $26 a year in going to a premium double glazing. Over, say, an 80 year lifetime of the windows, going to basic double glazing is clearly worthwhile economically, but there may be diminishing returns in spending a lot more than that in the moderate climates of Sydney/Adelaide/Perth if you have a fair tolerance of indoor temperature. The more heating and cooling you do though, the more worthwhile it gets to upgrade windows further. This doesn't take into account the radiated heat from direct sunlight on unshaded windows. This can add a lot to the heating load, and low-e glass can make a significant further difference again in this situation. Also, if you have effective curtains that are closed, that can also significantly reduced the conducted heat transfer, so the savings in upgrading glass are less when that is the case. Re: Double Glazing cost and advice 6Sep 12, 2015 1:14 am I was quoted an extra $17k to upgrade from G James Double Glazing to UPVC. This was through a shop and not a builder. With everything there's cost vs benefit. If you intend to live in the house for 10 years, would spending an extra $17k (using my example above) save you $1.7k p/a in costs... or will it improve the value of your house by this much (I'm guessing <10% of the populace knows what UPVC windows are). That's the decision making process you should consider. Re: Double Glazing cost and advice 7Sep 12, 2015 10:33 am Well to upgrade from the builder supplied windows that were commercial grade windows with 5mm glass to full double thermal broken tilt and turn windows with hidden hinges etc and 6.38 x 2 with a 16mm argon gap for my entire house was 10500 more after offsetting the credit from my builder. My supervisor said that they are the best looking windows he has ever seen. The house has some very large windows from floor to 2700 etc. I think that it is something to consider when building. I am in a quiet area but still wanted DG throughout for the thermal properties and the sound benefits is also a benefit. I dont think you can equate everything to cost benefit as this can be a case of the whole is better than the sum of the parts. 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 19080 For your reference Performance Labels: Window assemblies in housing, except timber windows, must be labelled so the label can be seen when it is in situ. For timber… 6 7678 Versaloc is a mortarless besser block system that still needs a properly engineered footing. If you just do a 400x200 footing it will fail in time. At 17m long you need it… 1 15623 |