Hi. I've been adjusting the TV aerial on the roof. The roof ridge has a row of half round tiles; the tiles are separated by about1 inch with mortar in between.
I've noticed there are small gaps, around a millimetre, at the edges of some tiles - the mortar has separated from the tile edges. They may have been like this for some time or it might be because I disturbed the tiles (walking/sitting on them).
The morter between the tles is in good condition and very hard to break. I tried chipping away as I was thinking about cutting it back enouigh to try pointing, but it is really tough.
Should I do anything about 1mm gaps? If so, is there a good way to fill them without cutting back the existing mortar?
Thanks.