Mr Inspector is a qualified building inspector with a diploma of Building Surveying and carries out pre-purchase building inspections Melbourne.
The above photograph was taken during a recent building and pest inspection in Gardenvale, Melbourne and depicts a common rafter that has been cut to accommodate a sky light installation.
This is commonly seen and although should not cause any problems it would not be advisable to walk on the roof above. Additional support for the tile load above should have been installed to comply with Timber framing standards.
Worst case scenario here is that the tile weight may cause some sagging and potential leaking.
It is a relatively easy and inexpensive fix.