This may have been caused by any number of factors.
Roof tiles have settled on roof trusses are ok.
Each time you drill into your roof.
The trusses will be securely vertically propped prior to being lifted to the roof area.
I e the original roof was a light wood shingle roof and the new replacement roof is a concrete tile roof weighing 5 or 10 times more than the original roof.
If the original roof was wood shingles a light weight material and it was replaced with concrete tile a heavy material then the roof may sag or be wavy because it was not structurally designed to carry the heavier load weight.
A roof s primary purpose is to protect the interior of a building by keeping out the elements and a roof can t stave off the weather if it s riddled with holes.
A new roof that is of a heavier material.
Roof lines should be arrow straight.
Materials handling storage safety information.
In the past it has been stick construction 2x8 s 2x10 s or 2x12 s.
It might be something.
Cracked or damaged rafters or trusses.
Hammers nails and other hand tools will be.
The weight of these roof tiles brings up another question.
Roof trusses will be delivered to site.
This is an upscale builder 300k range.
Then the beam or roof may sag.
If you can see a dip curve or swag on the peak when standing in the street your roof has a problem.
This is the first time i have seen the tiles installed on a 2x4 truss roof system 24 oc with osb decking.