Repairing a crack in sandstone house

[denisegordon]

Our house is made of sandstone blocks, and there is a crack which we need to repair. It's in a block which forms the bottom edge of a window frame so you can look down into the crack. Other cracks have been fixed before we bought the house, with some sort of filler product. What product do we need? Is it available in B&Q?

We've had the crack inspected by an Engineer who said it wasn't a problem crack, but we do need to fix it.

[ianmunt]

prime with PVA bonding agent and make up a mortar mix using sand selected to closely match the stone.You may have to make up experimental small mixes away from the repair site and let them harden,in order to find a suitable match before actually filling the crack with the best match