Sand Calculator
Whether you're laying a patio, jointing paving, plastering walls, or mixing mortar, this calculator tells you exactly how much sand to order.
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.
Safety and Regulations
Most structural and electrical DIY work in England and Wales must comply with Building Regulations and is notifiable to local Building Control. Work that is not notifiable (like-for-like replacements, cosmetic changes) can be done without notification. Notifiable work done without approval is technically illegal and can cause problems when selling the property. Electrical work in most rooms requires a Part P competent person or Building Control inspection. Gas work must always be performed by a
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