Had some work done on verges and roof. Questioned "roofers" as found packet of "internal mortar" which I would assume should be used for internal cracks etc. Concerned they used this on roof as don't think would be as waterproof/ good as proper roof cement. They said they added this to cement to...
Thanks folks. Yes they said the tiles had lifted a bit and could lift further/ come off with a gust of wind. It's hard to find roofers that people I know would recommend. Asked around but half our neighbours have had cowboys.