Sand Calculator

Choosing the Right Sand

Sharp vs Building Sand

Sharp (grit) sand has coarse, angular grains — used for concreting, laying paving slabs, and screeds. Building (soft) sand is finer and rounded — used for bricklaying mortar, plastering, and pointing. Using the wrong type affects strength and workability.

Kiln-Dried Jointing Sand

Kiln-dried sand is used for brushing into the joints of block paving and natural stone. Unlike damp sand, it flows freely into fine joints without washing out. Polymeric jointing sand binds after wetting and resists ant and weed intrusion better.

Mixing Ratios for Mortar

Standard bricklaying mortar: 1 part cement to 4–5 parts building sand. Floor screed: 1 part cement to 4 parts sharp sand. Paving bedding: 1 part cement to 5 parts sharp sand. Always add water gradually until workable but not sloppy.