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We have exposed a fair amount of other wall which is far thicker and in reasonable condition, so the rot does appear limited to the back of the hearth. That said, we also been advised to remove the concrete harling from the outside to prevent further damage to the sandstone - this is something...

Thank you for your replies. Yes, probably unnecessary but better safe than sorry - as we cleaned the wall down it wasn't clear whether large spaces between stones where mortar had disappeared were new or not. I will post some better pics as soon as possible. The sheeting is visible in a...

Photo by Makingtime posted 27 Mar 2017 at 11:19 AMPhoto (1) by Makingtime posted 27 Mar 2017 at 11:19 AM

Back of hearth showing sandstone deterioration to point that backing of external concrete harling visible.

Hello It is a solid sandstone wall. The walls are around 2 foot thick but the back of the fireplace seems to reduce to about 6". I have attached a photo of the fireplace and a close up of the back of the hearth - the green plastic appears to be sheeting applied to the wall on the outside under...

I have uncovered a large red sandstone fireplace (about 2 meters wide and a meter deep). It had been infilled with a large amount of bricks and cement. The stones at the back of the hearth are in very poor condition and in places have brushed away completely, exposing the concrete harl on the...