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Author Topic: Under floor insulation  (Read 1804 times)
thepaperboy
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« on: Wed 23 April, 2008 - 06:24 pm »

 for an older house I have heared that the batt foil can be hard to lay if space is limited . But those white pannels need to to surported if you need to cut them because your joists are to close together. What have other piople found .
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Stu
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« Reply #1 on: Wed 23 April, 2008 - 06:52 pm »

I did our house, laid plastic over the ground to stop moisture rising, and stapled foil paper stuff under the floorboards ... house is still blardy cold

That Expol(I think it's called) looks pretty good, but yeah, you'd need to cut them to fit, they're designed to just slot in ... they may even cut them to the size you need when you order them, might be worth checking out
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thepaperboy
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« Reply #2 on: Wed 23 April, 2008 - 07:02 pm »

 Expol was the other one that I was thinkihg of. The foil that you layed did it have the pink batt stuff on one side? The person that layed his foil stuff did & he said that it made abig different.
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Stu
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« Reply #3 on: Wed 23 April, 2008 - 07:08 pm »

Nah it didn't, was just black paper on the back,was just sitting under our house when we bought it, the previous owner had done half of it, I finished it off ... we also have no carpet which probably adds to the coldness too ... We've only had one cold night this year, and it was Saturday night when poor westy had to sleep on the floor
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thepaperboy
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« Reply #4 on: Wed 23 April, 2008 - 07:10 pm »

Nah it didn't, was just black paper on the back,was just sitting under our house when we bought it, the previous owner had done half of it, I finished it off ... we also have no carpet which probably adds to the coldness too ... We've only had one cold night this year, and it was Saturday night when poor westy had to sleep on the floor
The person that I am talking about told me that they took up alot of the carpets & it made the house cold, & that what made him put in the underfloor insulation.
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dab
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« Reply #5 on: Wed 23 April, 2008 - 07:14 pm »

you can get 2400mmx1200mm x 30-40mm sheets of polystyrene at mitre 10.

if you can manage to get those under your house you could use either no more nails and some nails with washers on to hold it to the joists while the glue dries(poly doesn't need to go between, it'll do the same thing). i think this would be easier & less cost than the stuff your talking about.
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Stu
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« Reply #6 on: Wed 23 April, 2008 - 07:18 pm »

Do you know the approximate cost of the polystyrene sheets???
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thepaperboy
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« Reply #7 on: Wed 23 April, 2008 - 07:19 pm »

 Thanks dab The white stuff is what I was thinking of until I was told to think carefuly, Thats why I have asked here to see what other piople have done, & how they have found it.
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thepaperboy
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« Reply #8 on: Wed 23 April, 2008 - 07:21 pm »

 By the way Stu have you, sealed the joints on your sheeting thats on the ground been sealed?
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Stu
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« Reply #9 on: Wed 23 April, 2008 - 07:29 pm »

By the way Stu have you, sealed the joints on your sheeting thats on the ground been sealed?




All but the master bedroom are OK tho, before we bought it we got a building inspection done, and we have a deck that was only built a few years ago, the builder commented that the deck is covering the ventilation holes under that room and it could be cold and damp, turns out he was right.  Even when I was doing the insulation, it was quite breezy under the house until I got under the master bedroom, was really calm under there ... and that turns out to be the coldest and dampest room in the house, and also gets the most sun, so the ventilation did make a huge difference.  We're just going to move to another room this winter, fark putting up with soaking wet blankets every morning for 4 months again ... I'll eventually get it sorted, insulated and warm
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thepaperboy
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« Reply #10 on: Wed 23 April, 2008 - 07:35 pm »

 Yes ventulation is very important.
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Brain
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« Reply #11 on: Wed 23 April, 2008 - 08:10 pm »

they used to advertise an aerated concrete that you could have pumped under the house instead of putting plastic down, not sure what was invloved...anyone?
and if doing the foil under the floor you have to look out for power cables, not good to staple into them  eek
been thinking about doing the expol thing but i like dabs idea of using the full sheets.
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bytey
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« Reply #12 on: Wed 23 April, 2008 - 08:37 pm »

usng whole sheets nailed or glued to the joists would be qite good too becaus ethe gap of air inbetween is really good for insulation
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pebbles
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« Reply #13 on: Wed 23 April, 2008 - 10:17 pm »

Do you know if that expol stuff sucks up much moisture ?.
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Brain
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« Reply #14 on: Wed 23 April, 2008 - 10:57 pm »

shouldn't do at all should it?

might be something here  http://www.expol.co.nz/technical_information.htm
but i'm too tired to digest it tonight
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pebbles
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« Reply #15 on: Wed 23 April, 2008 - 11:04 pm »

shouldn't do at all should it?

might be something here  http://www.expol.co.nz/technical_information.htm
but i'm too tired to digest it tonight

thanks, I will have a look. Don't think our old house has any insulation at all. We thought we would start at the bottom and work our way up.
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dab
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« Reply #16 on: Wed 23 April, 2008 - 11:10 pm »

Do you know the approximate cost of the polystyrene sheets???

f**k all...maybe $10 per.

or better still, there is a place in Aucks that makes the stuff....i'm trying to remember the name of it....it's in onehunga i think.
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dab
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« Reply #17 on: Wed 23 April, 2008 - 11:18 pm »

i can't remember.

most peeps will say you need hi-density stuff..but i reckon it would be sweet with normal stuff.....afterall it's under a house and not exposed to the elements. as long as its fairly thick it should be fine...
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dab
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« Reply #18 on: Wed 23 April, 2008 - 11:19 pm »

i think it might be expol itself!

i'm sure they make all sorts of poly.
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Brain
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« Reply #19 on: Wed 23 April, 2008 - 11:29 pm »

http://www.styrobeck.co.nz/

http://www.polycut.co.nz/index.cfm?page=F52E1D2F-FB00-D1CD-AD21EB7379997DD8
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Coach
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« Reply #20 on: Sat 26 April, 2008 - 02:17 am »

Someone post a new thread!
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This is pitiful. A thousand people freezing their butts off waiting to worship a rat. What a hype.
Weevilgenius
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« Reply #21 on: Sat 26 April, 2008 - 09:55 am »

Someone post a new thread!

here you go:

http://www.thelastpost.co.nz/topic/12850.0.htm  eek
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The Schizzle
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