Adding to this, when making concrete, ‘sharp sand’ is preferable to ‘building sand’ as it’s chunkier. Building sand is more commonly used for mortar and gives a

Adding to this, when making concrete, ‘sharp sand’ is preferable to ‘building sand’ as it’s chunkier. Building sand is more commonly used for mortar and gives a better finish. However this is a distant memory of what a brick layer was instructed me on when I was getting supplies for him a long time ago. The below link seems to agree. https://buildingadvice.co.uk/sharp-sand/ https://buildingadvice.co.uk/sharp-sand/