Hi there,
Does anyone know if you can use normal plasterboard (not fire proof or water proof) for external ceiling under alfresco and porch? Our builder says they only use normal plaster and if we want them to use anything else it will cost extra. Apparently the area is too big to use fibre cement sheeting, at least that's what they told me. We are also in BAL 12.5 bush fire area and have already added BAL 12.5 bushfire requirement in our quote which include a heap of extras such as sarking to roof etc... but it doesn't mention anything about the plaster board ceiling.
Doesn't it have to be at least water proof for outside use? Wouldn't you get mould otherwise? Sounds strange to me...