What is falls and gradient in paving?

Falls and gradient is the deliberate slope incorporated into a paved surface, such as a driveway, patio, or forecourt, to direct rainwater away from buildings and structures. Without adequate fall, water sits on the surface and infiltrates joints, sub-bases, and foundations, leading to damage, frost heave, and long-term deterioration.

Paving contractors in Cheltenham typically work to minimum fall ratios that balance drainage efficiency with practical construction and aesthetics. A common standard is a fall of 1 in 40 to 1 in 60, meaning the surface drops 1 unit of height for every 40 to 60 units of horizontal length. On steeper sites or in areas prone to heavy rainfall, contractors may increase the gradient to 1 in 30 or steeper. Conversely, tight spaces or level ground may require careful micro-falls to ensure water still moves away from the property.

Achieving correct falls requires accurate setting out, proper use of levels and laser levels, and careful attention during the laying and compaction of materials. The final surface must slope consistently toward designated drainage points, such as gullies, soakaways, or surface channels. Poor or absent falls are a leading cause of premature paving failure and water ingress complaints. When instructing a driveway paving contractor, specifying falls and understanding site drainage is essential to a long-lasting installation.