Hi folks, I wanted to provide a little project update.
After inspection of the existing structure with the builder and an engineer, it was determined that were enough structural inadequacies to warrant pulling it down from scratch. So thats the way we are proceeding.
After Stuarts suggestion of using a layer of OSB to improve sheer strength and add a nailing surface, the builder suggested using Yellow Tongue flooring. This product which works out at 13kg/sqm at a cost of $1.4/kg of mass, which is almost exactly the same cost/kg as Fyrecheck, and significantly cheaper than 6mm OSB which is $4.75/kg. As it is a particle baord I was concerned about moisture damage in the external walls, however it's advertised as being water resistant.
Has any one used Yellow Tongue? Can you see any concerns?
https://www.bunnings.com.au/3600-x-800mm-19mm-flooring-particleboard-yellow-tongue_p0148884
For insulation, I'm looking at getting Earthwool R1.8 batts. They have a density of 11kg/m3 and cost $6.50/m3.
Has anyone used Earthwool R1.8? Do they look appropriate or is there a more cost efficient product available in Australia?https://www.bunnings.com.au/earthwool-1 ... lsrc=aw.dsDue to the astronomical costs of construction currently, my initial budget of 150k is not going to be achievable, so I'm saving a little money by removing a few internal windows and one wall, and using two mini splt aircon units instead of fully ducted. We'll build the wall frames to accommodate adding these windows and walls easily in later years if they prove to be neccesary.
And finally, demolition of the existing garage has begun!
I cant believe its finally happening - and even after planning it for so long I'm still so unprepared!