Screw this cold!

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DarthKermit

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#119560 5-Jun-2013 18:53

I've started ripping the gib off the external facing walls in our two bedrooms so that I can install insulation in the walls.

What do you guys recommend for a good wall insulation?

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meow
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#831205 5-Jun-2013 19:03

Putting on a Jersey, seems to work well.

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langers1972

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#831206 5-Jun-2013 19:04

Celotex http://www.celotex.co.uk/country/please-choose/new-zealand

Bung

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#831208 5-Jun-2013 19:07

If you haven't got a building permit don't attract too much attention.

There's an NZ Standard on Insulation NZS4246 that you can download that gives advice. Look up the bit on vapour barriers.

mattwnz

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#831209 5-Jun-2013 19:11

Google Design Navigator, and it has a tool for calculating insulation. Has most of the top brands and all the R-Values. Perhaps something like wool?

mattwnz

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#831210 5-Jun-2013 19:17

Bung: If you haven't got a building permit don't attract too much attention.

There's an NZ Standard on Insulation NZS4246 that you can download that gives advice. Look up the bit on vapour barriers.

Apparently they would need one if installing in external walls, as apparently it can interfere with weather proofing. I don't think the NZ standards are free to download, and they are expensive to buy. But if the OP knows someone who is a student, they maybe able to get free library access to it.

B1GGLZ

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#831215 5-Jun-2013 19:28

We used Airfoam to insulate our home. Quick and easy. Doesn't require the gib being stripped. They just punch some 25mm holes and pump it in. We were redecorating the whole house anyway so the holes were just filled, sanded and new wallpaper hung. No building permit was required. If you've got the gib off already though the best to use would be sprayfoam like in Holmes on Homes (although I've no idea who does it in NZ) which provides a complete thermal break. Next best would be solid foam with gaps sealed.

Bung

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#831232 5-Jun-2013 19:58

mattwnz: I don't think the NZ standards are free to download, and they are expensive to buy. But if the OP knows someone who is a student, they maybe able to get free library access to it.

Link to PDF http://www.energywise.govt.nz/resource/new-zealand-standard-installing-insulation-nzs-42462006-0

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timmmay

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#831235 5-Jun-2013 20:01

Airform can shrink - it did a little inside my walls after a few years. I'd put in the thickest pink batts that fit, personally.

Bung

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#831239 5-Jun-2013 20:06

B1GGLZ: We used Airfoam to insulate our home. Quick and easy. Doesn't require the gib being stripped. They just punch some 25mm holes and pump it in. We were redecorating the whole house anyway so the holes were just filled, sanded and new wallpaper hung. No building permit was required.

MBIE say otherwise but maybe your council doesn't care. http://www.dbh.govt.nz/retrofitting-insulation-guidance#fid3

Aredwood

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#831332 5-Jun-2013 21:54

Consider Pink batts. They do a R2.8 That fits in a 90mm (4 by 2) framed wall. Don't know of any others that give that R value yet are still only 90mm thick.

B1GGLZ

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#831362 5-Jun-2013 22:39

Bung:
MBIE say otherwise but maybe your council doesn't care. http://www.dbh.govt.nz/retrofitting-insulation-guidance#fid3

Schedule 1 of the Building Act now exempts underfloor and roof insulation retrofits from building consent2. However, retrofitting insulation into a wall cavity is not exempt; it either requires a building consent or specific approval from a BCA that a building consent is not required3.

I'm pretty sure the installation company has a specific exemtion as allowed for in the Act. They definitely didn't need a consent from North Shore City Council.

Bung

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#831371 5-Jun-2013 23:12

The current Auckland Council accept Producer Statements from approved installers.

"On completion of the work, the following documentation is required to accompany the application
for code compliance certificate (CCC)
•producer statement construction (where agreement is reached in lieu of an inspection); and
•compliance management report
Compliance management reportmeans a report provided by the installer that confirms-
•invasive moisture testing has been carried out andmoisture has returned to equilibrium
(only required for wet installed insulation)
•holes have been properly repaired (plugged, sealedand painted)
•installation has not affected the ongoing compliance of the building "

langers1972

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#831390 5-Jun-2013 23:50

Aredwood: Consider Pink batts. They do a R2.8 That fits in a 90mm (4 by 2) framed wall. Don't know of any others that give that R value yet are still only 90mm thick.

Celotex GA4000 gives R4.05 with the 90mm thickness, Batts are OK but are rubbish compared to modern materials, as usual Kiwis are ripped off and miss out on what's out there due to dominant players in the market choking competition.

mattwnz

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#831391 5-Jun-2013 23:52

timmmay: Airform can shrink - it did a little inside my walls after a few years. I'd put in the thickest pink batts that fit, personally.

Yes I read about that. I had a quote for it to be done on two walls in my house and it was too high for me. Although I have seen a house done with it, and the results looked quite good. Not sure of the R value, but I can't see it being as high as fibreglass or wool. I think if you can, you get better results removing the gib and installing it. You can get R Values of 2.8 with 90mm fibreglass batts. ALthough you can get an R-value of 3.15 if you use Polystyrene XPS 90mm . http://www.designnavigator.co.nz/CRC.php

mattwnz

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#831394 5-Jun-2013 23:57

langers1972:
Aredwood: Consider Pink batts. They do a R2.8 That fits in a 90mm (4 by 2) framed wall. Don't know of any others that give that R value yet are still only 90mm thick.

Celotex GA4000 gives R4.05 with the 90mm thickness, Batts are OK but are rubbish compared to modern materials, as usual Kiwis are ripped off and miss out on what's out there due to dominant players in the market choking competition.

Haven't heard of that before, how does it compare on price and durability/life of fibreglass or wool? The other way to get that r-value is to have 140 framing, if doing a new build.

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