Silica sand is very easy to move and transport, you can carry it around with ease. You will need an adhesive or mortar for your outdoor fire pit installation because of its lightweight properties which make silica sands great for use as infill materials under gravel paving stones and deck flooring too. Once they’re glued down; you don’t have to worry about them moving anywhere so long as the surface they sit on maintains their original height. Just be sure not to place any sharp objects near where silica sand is installed such as rocks, pebbles etc… This could cause damage that may lead into future problems.