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Yes its also good to use safety mesh. You can buy it from a roofing supply store. Wrap a "runner" around the start of the roof and run it sideways and tie it off, wrap it around a beam and then itself 4 times.
It helps support the sarking. Run sarking sideways, it cuts with a Stanley knife, and start from the bottoms of the roof sheets. Overlap by a decent amount say 150mm.
An alternative, which is what I used, is simply to put foam cored insulation aircell type insulation. Bunnings sells it.Its about $110 a roll and a roll is 12m2 from memory. The Bunnings version is from Kingspan. A nice product.
No need for wire then as its more rigid and about 10mm thick. That will also keep your observatory less hot in summer. Its got an aluminium finish on both sides so I sprayed mine flat black to avoid light reflections.
Easy to handle and cuts with a knife, a very good product.
The problem with sarking is it will deteriorate eventually. Its not really a long lasting product but I suppose it will last 20 years so long as its not getting regularly wet.
Greg.
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