Gal will go grey (mid to dark grey) over 12 - 18 months. Initially VERY bright. The energy absorbed changes accordingly, from sub 5% absorbed to ~35%. Zinc maintains brightness for longer, though still suffers some dulling. Say 5% to 15% over time. This can be avoided by coating with a product called 'Sharkhide' metal protectant, used to stop aluminium boats oxidising. For there reasons many councils will not allow zinc or gal roofing (visual amenity, reflection issues), while making the houses more prone to requiring summer aircon at the same time. Surfmist Colorbond starts around 9% absorbed. If purely for energy reasons, a light colour might be the only option. If going dark, I would suggest at least doing the 'less aesthetically important' sides and rear in a light colour. Your call. If you go all dark, ensure you have good roof space ventilation for the summer that can be closed in the winter, and lots of well installed ceiling level insulation. Spray foam is more reliable over time than batts, see Spray It Solutions or similar (they have the Formaldahyde free Canadian Icenene foam).

All good colours I have Dune and medium brown bricks (boral mocha) and love it Boral colour consultant (free) suggested dune or basalt for my bricks but love the dune fades into sky. Plumber accidentally put windspray downpipes instead of ironstone and windspray clashed horribly with bricks as has blue base so go dune or basalt with your warm toned bricks - dune :)

Thanks for your response Luke We have decided on the surfmist for window and door frames. Should give that dramatic effect with woodland grey and dune. Will send you a pic once finished. Kind Regards Bernita

Yep, when we painted our house I went round in circles. Then the paint shops suggested we go look at a house that he new the colours of. We did and went with that. Internally several years earlier I had a colour consultant in and we adopted her colour schemes for the lounge and master bedroom,. I wasn’t happy with the suggestion for the master but went with it, and hated it from the start till I eventually repainted, she hadn’t listed to me. I was happy with the other room though. Get your sample pots and make sure you do 2 or 3 coats to get tru colour. It’s still a lottery sadly.