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Ceiling and Home Insulation

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We moved in to our new house and realised during the start of the summer months that our Family Room A/C struggled. After some curious investigations, I happen to touch the ceiling which felt unusually hot/warm. The specifications indicated installation of R2-4 Batts insulation in the walls and ceiling. I noted the outside temperature the other day was 34deg and it was like 30deg inside our Family room despite the A/C dial on 18deg with one electric fan circulating the air.

I was wondering how much heat should be transmitted through the ceiling if the insulation have been installed - should I measure the ceiling temperature? Where and from whom should I get help to assess if this job is done properly by the builder or not? What reference should I provide to make claims to the builder or QBCC? As much as possible, I am avoiding filing a dispute to QBCC with my builder.

Your insights would be greatly appreciated. Many thanks.
Ceiling insulation can be easily checked - just get into your under roof space through the manhole.

Other usual suspects - windows and leakages around window and door frames.
There's no manhole in that part of the house but there are downlights which perhaps we could use with a phone. Cheers
Thermal camera would help
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