Re: Timber floor by-law came ‘too late’

Mitsy – I agree with Jimmy T. It may be worth considering that perhaps the magnesite needed to be removed. Sometimes it can cause problems with the slab: 

https://remedialtechnology.com.au/33/News/19/Dealing-with-Magnesite-Problems-in-Sydney%E2%80%99s-Residential-Units/