Once you have safely gotten to the broken tile.
Replace roof tile from inside.
Get onto the roof.
Walk carefully on the ceiling joists in the attic or use a sheet of plywood to walk on so you will not accidentally put a hole in the ceiling panel.
2 break the faulty tile and remove the pieces.
You can use a ladder from the scaffolding platform to be able to access the part of the roof you require or as you now have a platform if the pitch is not steep walk up it.
Both of tiles are easily accessible from inside the roof space.
Cracked or broken roof tile 1 carefully pry up the tile or tiles just above the cracked or broken one.
The tiles have broken where the overlap the tile below so it would be a relatively short length to slide into the roof space.
3 spread a small amount of roofing cement along the underside of the replacement and slide it into place.
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Repairing a roof leak from the inside is a temporary fix only.
I could then slide a replacement into position.
Holes in roofing felt are quite common here we repair a hole in some roofing felt that is underneath the tiled roof.
Is it realistic to replace the broken tiles from the inside.
But just like any other material they are.
Also pry or force out any nails.
Make the final repair as soon as weather permits.
Fixing a roof tile crack.
Ensure you have the correct replacement tile as there are many different roof tiles on the market.
The replacement tile or tiles were easier to get in than out.
If the tile is directly above a rafter then you can ease out the tile next to it and slide it across.
No you cannot fit roof tiles from the inside to access the roof you use a scaffold and if they are in that bad a condition it might be time to replace the roof 70 years is a good life span.