What are flags (paving slabs)?
Flags (or paving slabs) are large, flat rectangular or square units made from concrete, natural stone, or porcelain, laid individually to form patio and outdoor surfaces.
Paving flags, also called slabs, are large-format paving units typically supplied as individual rectangular or square pieces. Common materials include concrete, natural stone (such as sandstone, limestone, and slate), and porcelain. These units are laid flat edge-to-edge across patios, garden areas, and outdoor terraces to create a finished walking surface.
Flags differ from block paving in both size and appearance. While blocks are small interlocking units (typically 100mm to 200mm), flags are considerably larger, often ranging from 400mm to 900mm across, meaning fewer pieces cover the same area. This size difference affects installation methods, drainage characteristics, and the final visual effect. Flags create a cleaner, more uniform appearance with fewer visible joints, whereas blocks create a textured, modular look.
The choice between flags and blocks depends on the desired aesthetic and practical requirements. Flags suit contemporary and formal garden designs, while their larger size can make patios feel more spacious. Because they have fewer joints, flags can be easier to clean but may require careful base preparation and proper laying to prevent rocking or settlement. Patio paving contractors in Cheltenham work with both materials and can advise on suitability for specific locations, soil conditions, and design preferences.