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Welcome to the Bunnings Workshop community @bluesue. It's terrific to have you join us, and many thanks for your question about installing Ametalin thermal liner.
Typically, this product is installed onto timberwork with Ametalin 25mm x 22mm Cap Nails. Attaching it to the roof of a shed or roller door would prove difficult. Perhaps for the shed roof, you might consider a sheeted product similar to Foilboard that can be adhered to the roof with silicone. For the roller door, a specifically designed product, like GI Building Sciences 10mm 0.5 x 24m 12m² Reflecta Garage Door Insulation, would be the most appropriate option. Both of these products would not only be easier to install but also provide a far greater insulating value.
Please let me know if you have any questions.
Mitchell
A note for our New Zealand members: The use of foil insulation products is prohibited.
I'm so sorry @bluesue. I missed the fact that it was a roller, not a panel door. Their Garage door insulation is 10mm thick, and they have concerns that it could get damaged with a roller door, so I am unaware of any insulation designed for roller doors. There is a chance that you could use GI Building Sciences 10mm 1.5 x 20m 30m² Reflecta Guard Plus as that is a thinner product. You'd still need to check the space between the rolled layers to ensure any product within them doesn't get damaged.
Mitchell
That's great to hear @bluesue. In that case, I'd recommend going with the thicker and better-insulated option of the GI Building Sciences 10mm 0.5 x 24m 12m² Reflecta Garage Door Insulation. I'll point out that the kit is 12m2, so you'd likely need two kits for a double-width roller door.
Here's the installation guide. The product is attached with silicone caulking.
Mitchell
