Browse Forums Heating, Cooling & Insulation 1 Sep 03, 2008 8:56 am I have an old house with a lot of large windows containing 8mm thick plate glass. I'm about to renovate the windows to reduce draughts. But a specialist firm is offering to replace the old glass (within the same wooden frames) with modern double glazed sheets.
Does anyone have any idea whether this would be likely to make a significant difference to heat loss? Someone else told me the old glass is thick enough to be quite well insulating anyway. Is there any way of taking a more educated guess at the difference? Re: Double Glazing vs 8mm Plate Glass - insulation properties? 2Sep 03, 2008 1:13 pm Thick glass will only marginally help. To get the best cost-effective performance (with the same frames), you need double glazed with an air gap between. Next step up the performan eladder is to get low-e glass for one of the panes. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Double Glazing vs 8mm Plate Glass - insulation properties? 3Jan 14, 2009 8:35 am I Don't know if you have considered using Magnetite. It is a dicreet secondary system that fits on the inside of your existing window and converts it to an insulated double glazed unit. It may be a cost effective and less intrusive solution than replacing your existing windows
for more info check out ***Link removed by Site Admin*** Re: Double Glazing vs 8mm Plate Glass - insulation properties? 5Jan 14, 2009 12:06 pm Magnetite I Don't know if you have considered using Magnetite. It is a dicreet secondary system that fits on the inside of your existing window and converts it to an insulated double glazed unit. It may be a cost effective and less intrusive solution than replacing your existing windows for more info check out ***Link removed by Site Admin*** It isn't double glazing (glazing refers to glass)... But I am sure it will work. Cost effective? Pass me a quote and I will beat it... with real double glazing... fully installed. Ed Re: Double Glazing vs 8mm Plate Glass - insulation propertie 6Jan 14, 2009 12:10 pm caltonian I have an old house with a lot of large windows containing 8mm thick plate glass. I'm about to renovate the windows to reduce draughts. But a specialist firm is offering to replace the old glass (within the same wooden frames) with modern double glazed sheets. Does anyone have any idea whether this would be likely to make a significant difference to heat loss? Someone else told me the old glass is thick enough to be quite well insulating anyway. Is there any way of taking a more educated guess at the difference? Thick glass will make no difference - only real double glazing will work. You need to talk to a glazier to see if there is enough room in the glass rebate to take a double glazed unit. 8mm is not enough, you need ideally 20mm but you can get benefits with 14mm. That is the total width available to install one unit = glass, air, glass. Ed Re: Double Glazing vs 8mm Plate Glass - insulation propertie 7Jan 14, 2009 4:14 pm caltonian But a specialist firm is offering to replace the old glass (within the same wooden frames) with modern double glazed sheets. Someone else told me the old glass is thick enough to be quite well insulating anyway. Glass conducts heat 40 x faster than air. http://www.engineeringtoolbox.com/therm ... d_429.html i.e. you would need a glass section 40 x thicker than the air gap to achieve the same effect. Most insulating materials work on this principle i.e. batts, polystyrene foam, thermal underwear and woolen blankets. Contrary to what people think, it is isn't the 'stuff' that insulates but the air trapped between. Air is an excellent conductive insulator as long as its not moving. Things are a different story when that happens. There is a maximum air gap for double glazing before significant convective air movement occurs. Re: Double Glazing vs 8mm Plate Glass - insulation properties? 8Jan 14, 2009 4:16 pm EcoClassic Pass me a quote and I will beat it... with real double glazing... fully installed. Ed Can you retrofit double real glazing for less than the cost of film applications? Does that involve putting a new frame in? How do you do this if it is all bricked in? Re: Double Glazing vs 8mm Plate Glass - insulation properties? 9Jan 14, 2009 4:23 pm dymonite69 EcoClassic Pass me a quote and I will beat it... with real double glazing... fully installed. Ed Can you retrofit double real glazing for less than the cost of film applications? Does that involve putting a new frame in? How do you do this if it is all bricked in? Depends on the price of the film - I know this one is expensive... But you simply make windows about 5mm undersize on the brick opening, pull out the old and slide in the new. Fit new achitraves. Ed Hi, just need to ask if anyone build with Central Properties in Victoria. Thankd 0 4008 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 19020 I am saying that double brick has similar thermal performance due to thermal mass effect. It will be still very interesting to see the state of your framing after 10-15… 10 29655 |