I just googled & found this site, which quotes cost of R2.5 75mm. there are other suppliers as well. What was quoted to you for cost of roof installation, and was it itemised so you can see exactly what thickness the foil-backed insulation builder will use? I'm guessing the thinner (lower R factor). So, the new quote should reflect a credit for the cost of previous insulation, since it won't be used, then cost of thicker insulation added. Does that make sense? If you are unsure, best to speak with the builder. https://www.pricewiseinsulation.com.au/product/heavy-duty-fletcher-permastop/

The roof is in good nick and being green probably fits in with the surrounding trees. It just needs a bit of modernising, which I don't think you will get with the Paper Bark. The following image shows a 'soft' colourscheme which you can imagine with your green roof, having very pale grey-green walls, off-white architraves, darker green shutters and charcoal door. Now check out the following colour mixes that also keep in mind your roof colour. I hope this helps.

Good morning Jill, I'm kind of an expert at helping people choose exterior paint colours to match green roofs in Australia. I can help you choose exterior colours to tie in with with current roof colour, windows and balcony. Head over to my website and send me an email and we can chat and exchange info. Click here for link to Website

With a North facing house the sun makes the front of house quite hot but only on those few days a year when it is over 40 with no sea breeze and I love the heat so ceiling fans work for me. The back of the house is much cooler and the winds generally come from the ocean side but can be from all directions at times as we know. On the west side of the house it is only app 1m to the fence line and so the option of having the garage on that side isn't viable. Sorry I am not up on terminology so when I said the set back was 7 odd metres that is the current set back from the front of my house to the road. The council requires 3m for house and 4.5 for garages. I have been looking more at mid century modern design and I don't really like it so I am looking at ways of changing up the bland facade to disguise the fairly flat roof line. With those in the know could I add a front porch and somehow blend the roof line into my current one to look more like this style? I realise it means saving more to afford it so on top of my current budget. I am just not sure how the roof line of the porch would look at the back end (how it would attach to my roof and look from the side and back) I wouldn't want it to look like it was just stuck on at the front. Would I carry that through to back of house so end up with a witches hat roof or is there a better way you can see this working. Once again thank you for all of your input I can't tell you how much I appreciate you taking the time to help me :)