Hello all. We are nearing the end of our renovation on a Charentaise longere. On the rear North(ish) facing elevation the stone walls have been pointed but a long time ago. Most of it is sound so I have no intention of redoing the lot as the area is huge...23 metres wide by about 6 metres tall!
At the top of the wall where it meets the overhanging roof the stonework doesn't go right up to the underside of the roof boards. I want to build it up as we have plenty of limestone rocks. I figure if it is sealed up it will reduce drafts/noise. Also it will be harder for various furry beasties to get into the structure of the roof. We built the walls up fully on the inside of the house before the grenier was dry lined, insulated and turned into bedrooms/bathrooms. However it is still a bit drafty behind the dry lining?
The roof is a newer mechanical tiled roof and it was done several years before we bought the house. There is no membrane (French roofers?) but the roof is sound and watertight. Next to that is 200mm of Knauf glass fibre insulation and then plasterboard.
So to my question!! We have used Tradifarge lime and cement mix and the local sand which when mixed 1 part Tradifarge to 3 parts sand gives a very light grey, almost white finish to pointed stonework on the interior. This works very well with the cream coloured local limestone. However if I use this on the rear exterior wall of the house it will stick out like a sore thumb. What can I add to the mix to tone it down. I want something that can go in the mix?