The roofing material is aluminium kliplok type stuff. Looking at the roof from above, the battens appear to be 600mm apart, since that is where the screws are. I have been tapping on the underside of the ceiling for any difference in the sound that's made, but it hasn't really helped me. The width of the room is 4200mm, and I guess the rafters could be at 450mm or 600mm centres. Now to work out how close the rafters are together. I assume I can choose batts up to 150mm in depth, so the new battens can be nailed on without the batts getting in the way. I was able to push the chopstick a further 50mm approx., which would be the additional height of the battens. At that point I felt a spongy layer, which I believe is the old insulation blanket. Heightwise, I have poked a chopstick through the hole in my ceiling and believe the rafters are 150mm deep. I now have to work out sight unseen the space available for the batts - working off both the height and spacing of the rafters. The roofer is the father of a friend of my daughter's he didn't really see the need for the extra batts, so I said I would supply them just to make things easier. The roofer will install the usual foil-backed blanket under the metal roof, and I will supply some batts to put between the rafters. It seems every roofer in Sydney has a huge backlog of work because of the persistent rain. Well, I finally got a roofer to come and quote for a flat roof replacement at the back of my house.
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