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popcorn!
Discuss Condensation on a bathroom extractor fan in the UK Electrical Forum area at ElectriciansForums.net
Just how much indepth explanation would you think is plausible here?? Over simplification it maybe but is totally relevant to the situation. The expanding foam insulation in this case isn't going to make the internal wall as cold (or anywhere near) as the external wall....
So what are you saying, that insulation material doesn't insulate between hot and cold and visa versa??
There as been cases where cold spots have been found to appear on the inner leaf after the full injection of insulation in hard to fill cavities. So is that some sort of cold bridging ? who knows and who really cares.
God, we could nit pick to the enth degree on every single Thread/Post on that basis....
OK just for you,let's just say that insulation between two surfaces reduces the transfer between hot and cold to a point it is Extremely unlikely that one side of the insulation will have any great effect on the other side... Is that better for you??
if air was a better insulator than fibreglass/kingspan/etc., then they wouldn't stuff the crap in studded walls and ceiling voids.
if air was a better insulator than fibreglass/kingspan/etc., then they wouldn't stuff the crap in studded walls and ceiling voids.
if air was a better insulator than fibreglass/kingspan/etc., then they wouldn't stuff the crap in studded walls and ceiling voids.
Oh dear, oh dear, oh dear ... the thermal conductivity, insulation value, of:
- Dry air @ 275 deg K ~ 2 deg C is 0.024 W / m K, @ 300 deg K ~ 27 deg C is 0.026
Dry Air Properties
- Polyisocyanurate foam, 'Kingspan' is 0.023 W / m K or 0.022 W / m K or 0.019 to 0.023 W / m K
Polyisocyanurate - Wikipedia, the free encyclopedia or
Celotex GA4000 Insulation Board for Floors, Walls and Roofs or
Kingspan Insulation - Kooltherm Rigid Insulation for Roof Wall & Floor Applications | Thermal Insulation - Kingspan UK
- Glassfibre 1.2 to 1.35 W / m K
Properties: E-Glass Fibre
What the manufacturers' brochures do not tell you ... the thermal properties of polyisocyanurate foam are dependent upon the gas used to 'blow' the foam. This gas can 'leak' and reduce the thermal properties of your insulation, it becomes a ~ 17 % better conductor in the first 6 months; a less effective insulator than dry air. In some other manufacturers' foams, I do not know about all, less than environmentally friendly gasses have been used as the insulating medium. The products of combustion of the foam are amongst the primary killers in house fires.
Glass fibre relies on its air content to do its insulating job ...
Air ... its problem is if heated it changes density and being a gas will rise being replaced by cooler, denser air. Its problem is heat movement by convection not conduction ... though its insulating properties are negatively affected by its moisture content.
As with all things, a little knowledge is a dangerous thing ... and you can prove anything with statistics, badly designed experiments, poorly chosen comparators or blatant withholding of the truth!
Furthermore, don't believe anything a marketing specialist tells you about the product that they are selling until you have used it and proven its capability and your need for it before buying!
Hogwash!! So what about the cavity wall insulation balls, that gets pumped into cavities or the expanding foam type insulation sprayed into cavities??
Insulation material does not conduct either heat or cold, that's why it's called ''insulation''
F**k about,I read the first three lines and got bored haha
Don't mess about there Lee, just say what you feel.
I think we should make Lee an Honorary Geordie for that
I think we should make Lee an Honorary Geordie for that
As with all things, a little knowledge is a dangerous thing ... and you can prove anything with statistics, badly designed experiments, poorly chosen comparators or blatant withholding of the truth!
Oh dear, oh dear, oh dear ... the thermal conductivity, insulation value, of:
- Dry air @ 275 deg K ~ 2 deg C is 0.024 W / m K, @ 300 deg K ~ 27 deg C is 0.026
Dry Air Properties
- Polyisocyanurate foam, 'Kingspan' is 0.023 W / m K or 0.022 W / m K or 0.019 to 0.023 W / m K
Polyisocyanurate - Wikipedia, the free encyclopedia or
Celotex GA4000 Insulation Board for Floors, Walls and Roofs or
Kingspan Insulation - Kooltherm Rigid Insulation for Roof Wall & Floor Applications | Thermal Insulation - Kingspan UK
- Glassfibre 1.2 to 1.35 W / m K
Properties: E-Glass Fibre
What the manufacturers' brochures do not tell you ... the thermal properties of polyisocyanurate foam are dependent upon the gas used to 'blow' the foam. This gas can 'leak' and reduce the thermal properties of your insulation, it becomes a ~ 17 % better conductor in the first 6 months; a less effective insulator than dry air. In some other manufacturers' foams, I do not know about all, less than environmentally friendly gasses have been used as the insulating medium. The products of combustion of the foam are amongst the primary killers in house fires.
Glass fibre relies on its air content to do its insulating job ...
Air ... its problem is if heated it changes density and being a gas will rise being replaced by cooler, denser air. Its problem is heat movement by convection not conduction ... though its insulating properties are negatively affected by its moisture content.
As with all things, a little knowledge is a dangerous thing ... and you can prove anything with statistics, badly designed experiments, poorly chosen comparators or blatant withholding of the truth!
Furthermore, don't believe anything a marketing specialist tells you about the product that they are selling until you have used it and proven its capability and your need for it before buying!
So basically in all that you are agreeing that in a domestic situation, where air won't be dry and where it won't be still you are better off with an expanded foam insulation or glass fibre because it is those parts that prevent the air from moving around, hence providing the insulation factor and is why we wear clothes because they prevent direct enviromental air from cooling down our body because the clothes slow down the air movement changes. Our do you walk around in winter in just your budgie smugglers in the hope that theroetical properties of air at ideal conditions will stop you getting pneumonia....
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