Thread: Home Insulation

What's currently in the ceiling space...and what are they offering to lay over the top?

rockwool over rockwool should be ok ,so long as it is laid in-between the joist, dont use foil, ever

I understand that the grant only applies to houses without insulation - therefore you would have to get the old stuff removed first before the new stuff goes in - and if the authorities hear about it - no rebate.

Garry

Originally Posted by garrycol

I understand that the grant only applies to houses without insulation - therefore you would have to get the old stuff removed first before the new stuff goes in - and if the authorities hear about it - no rebate.

Garry

Not quite...

Householder eligibility

To be eligible to obtain the assistance the Householder must:
...
* be arranging the installation of new Ceiling Insulation, not replacing existing Ceiling Insulation above what is deemed as having Negligible Effectiveness (see ‘Definitions’); and


Negligible Effectiveness - Ceiling Insulation is deemed as having negligible effectiveness if it is at or below 0.5 R-Value. The Installer makes a declaration in the Work Order Form that the R-value of existing insulation is 0.5 or less.

If it is <0.5 R then it is basically doing nothing. I suspect they are just trying to save time/money, and possibly 0.5R on the stuff they install???

What type do you have and what type are they installing?

just wooly stuff in there now, probably 15yo at least.

garry - reading the requirements it allows for "be arranging the installation of new Ceiling Insulation, not replacing existing ceiling insulation above what is deemed as having Negligible Effectiveness;"

would suggest current stuff is having negligible effect at the moment.

just trying to avoid having to remove old stuff first if it is not going to effect the insulation properties of the new stuff on top.

cheers
liam

Originally Posted by Yorkie

just wooly stuff in there now, probably 15yo at least.

garry - reading the requirements it allows for "be arranging the installation of new Ceiling Insulation, not replacing existing ceiling insulation above what is deemed as having Negligible Effectiveness;"

would suggest current stuff is having negligible effect at the moment.

just trying to avoid having to remove old stuff first if it is not going to effect the insulation properties of the new stuff on top.

cheers
liam

Insulation R values are additive, definitely leave the old stuff in if there's room for the new, can only end up with better insulation value.

As a builder, I agree, the thicker up to a point the better.
watch out for un-licensed installers, 12v halogen fittings and their associated transformers especially the older ones need room as the heat up, a lot.
Insulation has to be placed carefully and consistantly so there are very little gaps.

Do not just squash it in as that will reduce its effectiveness greatly.

Originally Posted by richard4u2

rockwool over rockwool should be ok ,so long as it is laid in-between the joist, dont use foil, ever

Why? (Apart from the dodgy installs in the news)

Ralph