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Welcome to the Bunnings Workshop community @havad. It's brilliant to have you join us, and many thanks for your question about installing polycarbonate sheeting.
Requesting the installer to return and use the appropriate and specified sheet fittings in the approved fashion would be best. I can't imagine using standard screws and silicone is a method that is adequate or compiles with the warranty stipulations for the product.
Regarding specific information on this product and ways to resolve the situation, it would be best to contact the manufacturer and speak to them directly. They would be the best source of information about their product. I am unaware of the best method as it is not a product we stock. Our polycarbonate sheets require the use of specific screws designed for polycarbonate. They come pre-installed with a rubber dome washer that seals against the sheeting and prevents water from leaking through their holes.
If you want to go down the weatherproof tape path, we have Weatherproof Byute Flashing that could potentially be used. However, I recommend you check with the manufacturer of your roof sheeting to ensure compatibility.
Please let me know if you have any questions.
Mitchell
Butyl tape is just a bitumen tar-backed aluminium tape @havad. It's typically used for various types of weather-proofing on roofs and gutters; I'm sure you'd find something similar locally. You could also try just adding more silicone over the screws or, as you mentioned, removing them and adding more to the hole.
Mitchell
