Sarah
Hey John,
Resene Integra is a very good product, its probably up the top of the aerated concrete products. There isn’t a problem with a plaster finish – although you will have to get it re-painted probably every 10-15 years or so to keep it looking good. The whole leaky building thing was mainly to do with direct fixing of claddings – with Integra we usually use a 20mm cavity and it is very strict now with using the correct flashings etc under E2 of the Building Code. Councils are very hot on it. I would happily use Rockcote on my own house (I’m an Architectural Technician). If you do like weatherboards then I would suggest linea over timber (as long as its fitted properly and sealed properly) there is a good guarantee period on it. Hope your build goes well 🙂