There is a comprehensive guide at the Bluescope website at http://www.steel.com.au/products/coated-steel/colorbond-steel/basix-and-bca-classification

FINALLY after too long, have completed one of the upper cedar wall replacements (& the most needed)... still debating colours. Altho I was set on the cedarshield natural cedar oil product, everyone is pushing paint due to longevity... because we missmatched old with new boards on verandah section, don’t think cedarshield would bring out same colour evenly unless a lot of time trying to ‘clean’ the old boards top layer. SO, back to colours. Thoughts? Light and beachy/modern is attractive but don’t think it’d suit the simple timber cottage look it has had for so long. Thinking dark trim with lighter weatherboards?

Hi there Mary, that's something I hadn't thought of re painting the ridge tiles, I had thought to replace them with the grey, it would depend on the condition of the ridge do they need re setting, this would be a good time to replace rather than fiddle with painting, Woodland Grey is a classic Colour Bond, Gully a bit lighter. Your Roof is a strong red colour, I would get a sample of both grey colours, if you have a spare red tile take it with you to look at samples good luck

Dulux wallaby, you could add a stainless steel edging to the garden, this could look fabulous with grey foliage and structural plants for your flower bed, you could pressure wash driveway and paint with driveway paint if needed.