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I have a stilt fibro house which has a concrete slab underneath. I believe the house was build in the 50s/60s. I want to make the house bigger and would like to close in the underneath section. I am unsure if the slab is to code or has a water proof barrier, also i am wondering how to attach a timber stud wall to the slab, (what protection is required if any, or can the timber sit directly on the slab) as i am thinking about giving owner building a go

If anyone can help me with any information that would be great.

Thanks,
Marty

what size of aggregate to use for residential house slab? 14 mm or 20 mm