New Laws for Trademan ?

12 years 1 month ago #414870 by billmckinstry

foufee;411489 wrote: not sure about a straight renovation but our extension which should start in a week or so requires double glazing to make the required R level or some such. We have exceeded the required insulation I think but not by enough to take out the double glazing. The rest of our house is a '70s build that had no insulation, we have done the walls but the ceiling is a nightmare and the floor is concrete slab.

Concrete Slab should be insulated enough ?? Very sad 70's houses were not properly insulated as this was when the Govt were giving subsidies to retrofit insulation yet your house was built with none ??

Are you sure there is no ceiling insulation ? It can be pumped in ??
Very sad if not possible insulate your ceiling.

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12 years 1 month ago #414897 by Hawkspur
Replied by Hawkspur on topic New Laws for Trademan ?
If you are renovating, as long as you do not make the building thermal performance worse, you do not need to improve it.
Extensions and new or larger windows may need to be double glazed, because you are creating a new space or in the case of larger windows, reducing the existing thermal performance.

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12 years 1 month ago #414901 by foufee
Replied by foufee on topic New Laws for Trademan ?
billmckinstry Our roof has a 5 degree pitch and the ceiling is on the same slope large boards straight to the rafters so no where to pump the insulation in. We would have to either bring down the ceiling boards and put the insulation up or remove the roof metal, roofing paper, wire and lay the insulation then put it all back again. Nobody has wanted to look at it :( That pitch made the extension tricky and we ended up having to have a straight extension of the shoebox rather than the shape that we wanted as the engineered roof was going to add about 30k to the build [:0]

I think the slab is ok insulation wise, as long as the carpet has a decent underlay, we have not noticed any cold from it but when we had the carpet up it was certainly cold to walk on.

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12 years 1 month ago #414908 by billmckinstry
Sounds like a hard nut to crack. If you have Exposed Rafters you may be able to put a layer of insulation under the ceiling and then a new ceiling panel under that. If the rafters are say 200mm you could use all of that space and just line under the rafters/joists or insert a panel say halfway so you have 100mm of insulation.

The concrete floor is a thermal mass and would feel cold if eg you lifted the carpet on a cool day and stood on a pce of floor where no sunlight warmed the concrete.

The slab should have a vapour barrier. If not your carpet may rot where a cabinet eg was sitting on the carpet. If no rot/moisture then the barrier is present.

The floor should have polystyrene slabs under it to help insulate but if not then you should still have a better floor then an uninsulated wooden floor - I think..

Concrete will hold the heat of a suuny day. ave as much sun shining on the floor in the winter, close the curtains at sun set and the floor should radiate the stored heat.

We had a concrete bock house with a conrete floor in Port Moresby. If we left the curtains open during the day we could not sleep well at night as the heat radiating from the thermal mass was very uncomfortable - not such in a NZ winter.
We could feel the heat as we walked down the hall to the bedrooms. The bedroom side of the house faced north west. We didn't notice the same on the north south side as the heat had mostly gone by late at night ie you don't notice the radiant heat when it is 30 deg in the shade :D

Good luck with your extension. :)

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