Browse Forums Windows & Doors 1 Dec 19, 2010 8:38 pm Hello all I am considering double glazing for some West facing Windows in our soon to be renovated house for some summer heat protection . (Not a Fan of LowE as I have been told the inside coating scratches easily and looks terrible when that happens) As all the Window frames for our extension will be custom built in Timber I was thinking is it as simple as having the Joinery company build the Frames so they can be double glazed or is it more complicated than that? ie Do we need special seals and the like as part of the frame? I understand the concept of double glazing with the Air gap and all but I just am not sure on the specifics of how a double glazed window is put together and where the main Cost factor comes into play. Is it the extra cost invovled based on the simple fact you are using twice as much glass or is it more complicated than that? Finally will double glazing help with protection form Heat gain as well as it does for heat loss in Winter? Re: What is needed to build a double glazed window 2Dec 19, 2010 9:10 pm We've just replaced 6 single pane clerestory windows with double glazed units. We did get a LowE coating on the inside of one side, and as that's inside the unit, it won't get scratched. One thing to watch is the depth of the window reveal. As we were retrofitting, we could only get an 8mm air gap with two panes of 4mm glass in the awning windows, because the reveal couldn't take anything bigger. If you can get the frames custom built, you can specify the depth of the reveal to accomodate something with a 12mm air gap, which is more efficient. The units are sealed when manufactured. We used silicon and timber beading when installing ours - no other seals or special parts. Adding the LowE coating to one panel increased the cost (in our windows) to almost double the cost of using plain glass. There is lots of information in the Your Home Technical manual: http://www.yourhome.gov.au/technical/fs410.html We also found a set of tables online which specified the U value of different air gaps, with different glass thicknesses, and using argon versus air etc. I can't find the link right now but perhaps someone else can point you in the right direction. Our veggie bed thread: viewtopic.php?f=19&t=38476 Re: What is needed to build a double glazed window 3Dec 20, 2010 10:14 am docker_rob Hello all I am considering double glazing for some West facing Windows in our soon to be renovated house for some summer heat protection . (Not a Fan of LowE as I have been told the inside coating scratches easily and looks terrible when that happens) As all the Window frames for our extension will be custom built in Timber I was thinking is it as simple as having the Joinery company build the Frames so they can be double glazed or is it more complicated than that? ie Do we need special seals and the like as part of the frame? I understand the concept of double glazing with the Air gap and all but I just am not sure on the specifics of how a double glazed window is put together and where the main Cost factor comes into play. Is it the extra cost invovled based on the simple fact you are using twice as much glass or is it more complicated than that? Finally will double glazing help with protection form Heat gain as well as it does for heat loss in Winter? You can just order the timber windows double glazed. As has been mentioned previously ask for 12mm air gap. Double glazing has no effect on solar heat gain, you need to add Low-E to the double glazed unit. Low-E doesn't work on it's own anyway and as you say it's hard to clean, and in laminated form it can spontaneously crack in single glazed. No special seals required, the double glazed unit comes assembled as a sealed unit. 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: What is needed to build a double glazed window 4Dec 20, 2010 10:24 am ed @ EcoClassic You can just order the timber windows double glazed. As has been mentioned previously ask for 12mm air gap. Double glazing has no effect on solar heat gain, you need to add Low-E to the double glazed unit. Low-E doesn't work on it's own anyway and as you say it's hard to clean, and in laminated form it can spontaneously crack in single glazed. No special seals required, the double glazed unit comes assembled as a sealed unit. Ed Hi Ed, So are you saying steer away from a Low E Laminated style glass? This was my next thought as on the WERS website it seems to rates OK and I was thinking the Low E coating would be protected by a regular pane of glass on the inside sheet. Is the "Spontaneous crackng" you refer to more prone in Colder climates or is it due to heat? https://forum.homeone.com.au/viewtopic.php?f=38&t=44762 My Owner builder journey extending a 1930's Bungalow Re: What is needed to build a double glazed window 5Dec 20, 2010 5:15 pm docker_rob Hi Ed, So are you saying steer away from a Low E Laminated style glass? This was my next thought as on the WERS website it seems to rates OK and I was thinking the Low E coating would be protected by a regular pane of glass on the inside sheet. Is the "Spontaneous crackng" you refer to more prone in Colder climates or is it due to heat? Hi Rob Stay away from single glazed Low-E full stop. Especially don't use laminated single glazed Low-E. The U values on WERS are accurate, but the Low-E glass only suppresses radiant heat, so the U value refers only to that, it won't work very well at all stopping heat from escaping, it's only real benefit is stopping radiant sunshine from entering the home, and that is what the U value refers to. Double glazing stops conducted heat escaping or entering. Used together you have the best of both worlds. 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: What is needed to build a double glazed window 6Dec 20, 2010 11:22 pm In order of benefit obtaining radiant control: Reduce the size of the west window opening Use external vertical shades Have a reflective tint on the window. or do all three. Do you need to improve winter heat retention in that are? How cold does it get in winter? Will you be using that room frequently? Heavy curtains with pelmets or cellular blinds are also effective ways of reducing heat loss. Re: What is needed to build a double glazed window 8Dec 30, 2010 10:15 am foc1 I think a big part of the cost of DG is the gas they put in between the panes... I think... For the 6 we've just had done, it was $10 per window for argon. Our veggie bed thread: viewtopic.php?f=19&t=38476 Re: What is needed to build a double glazed window 9Dec 30, 2010 12:48 pm lonnie foc1 I think a big part of the cost of DG is the gas they put in between the panes... I think... For the 6 we've just had done, it was $10 per window for argon. That's about right. Argon adds (or rather, subtracts) about 0.15 in U value - so a window of say 2 sq.m. would have a payback in Melbourne for Argon alone of 3 watts 24/7 @ 10 degrees Celsius temperature difference. Taking 333 hours to make 1 kWhr @ 20 cents* and 16,650 hours to recoup the $10. That's 2 years to repay $10... not bad. Argon does deplete and will have halved in 20 years. *I use 20 cents as an easy number to represent the cost of 1 kWhr, check your own account or convert from gas at about half that cost (so payback would be 4 years with gas heating). 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 I’m in a similar position except I’m after sliding 3 stacking doors. I am on a second-story apartment of which the balcony would not adequately fit any bi-fold or… 5 16071 I don't know them all, the first 2 top of your list are best known. Rylock is a good company, Stegbar is for sale. 4 16146 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. Im going to build two frames (pretty much a room within a… 0 10181 |