Everything I read, when I was doing my Patio, suggested that Sharp Sand was preferred, due to being stronger and less porous (thus less vulnerable to freeze/thaw over the winter). Ants really like burrowing into builder sand mixes as well apparently.
Having said that, my friend who has done MANY more DIY projects than me, has laid his slabs using Building Sand because he said Sharp Sand is much more difficult to work with. As far as I know, none of his bedding has fallen apart so I guess Building Sand does work overall.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!