piddy
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| posted on 14/1/09 at 07:53 PM |
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insulation experts
Hi. Are there any insulation experts on here?
I putting down extra glass wool insulation in my loft to take it up to 10”
I’ve found several sheets of polystyrene board 2’x 4’about 2” thick, I presume the previous owner put them up there for extra insulation.
Are they any good for this purpose? Or will they cause a problem?
I thought about just leaving them on top of the glass wool when I’ve finished.
Any advise gladly received.
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JoelP
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| posted on 14/1/09 at 08:02 PM |
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it can only help, but bear in mind that the glassfibre is fireproof (well, it wont burn or melt) but polystyrene isnt. That said, if you have a fire
up there the house is probably already runined!
[Edited on 14/1/09 by JoelP]
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Guinness
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| posted on 14/1/09 at 08:03 PM |
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Polystyrene board has a higher u value than quilt, so it's more insulating than quilt (per mm of thickness).
If I was you, I'd cut it into strips to fit tightly between the ceiling joists. Then lay a layer of quilt over that, then a final layer of
quilt at 90 degrees to the first lot.
The only slight problem with polystyrene is that it can react with the insulation on your wiring. Best not to let it touch the lighting circuits.
All to the best of my knowledge BTW.
Cheers
Mike
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coozer
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| posted on 14/1/09 at 08:24 PM |
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Kingspan all the way!
1972 V8 Jago
1980 Z750
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MikeR
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| posted on 14/1/09 at 08:26 PM |
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NB i'm sure Mike means the ceiling of your upstairs rooms, not the joists that hold up the tiles - i'm just making it clear otherwise you
risk condensation problems as you're meant to have 4" (i think) gap between the tile and the insulation to allow air to circulate.
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piddy
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| posted on 14/1/09 at 08:50 PM |
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Thanks chaps thats a great help.
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nick205
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| posted on 14/1/09 at 09:36 PM |
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I've recently (Nov) added a 170mm layer of Space blanket glass wool insulation at 90deg over the existing 100mm stuff between the ceiling
joists. Dead easy and quick to do and Homebase had a 2 for 1 deal on it at the time.
It's made a very noticeable difference to the house, not just on warm up time and heat retention, but on sound too. You can barely hear the
rain on the tiles anymore and where we live close to a rail line that noise is reduced too.
My next move is to sort out the up n over door of our integral garage.
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tomblyth
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| posted on 14/1/09 at 09:50 PM |
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polystyrene is only a fire hazard if its painted also it suffers from thermal degradation so its insulation value over time decreases, but 10 inches
of quilt will be fine ,leaving the poly wont do any harm. Don't rub your arms after putting the quilt down , wash the bits of in the shower, or
it will itch for ages.
see this link
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