What is tarmac and asphalt?
Tarmac and asphalt are bitumen-bound paving materials used interchangeably in the UK, though they differ slightly in composition and manufacturing process.
In the UK, tarmac and asphalt are often used as interchangeable terms for the same material, but they have distinct technical meanings. Both are pavement surfaces made by binding aggregate (stone, gravel, or chippings) with a sticky binder, but the binder differs between them.
Tarmac is short for tarmacadam, a process developed in the early 1900s where tar (derived from coal distillation) is mixed with crushed stone and laid hot. Asphalt uses bitumen (a petroleum product) as the binder instead of tar. Bitumen is now the standard in most modern paving work because it provides better durability, lower temperature requirements during laying, and better weather resistance than coal tar.
UK contractors and suppliers often refer to both materials as tarmac out of habit, even though they are technically laying asphalt. This can cause confusion for property owners and businesses who may not realise they are discussing the same material. The key difference that matters in practice is that bitumen-bound asphalt is more consistent in quality, performs better in British weather cycles, and has a longer design life than traditional tar-based tarmac.
When planning a driveway, car park, or road resurfacing project, contractors will typically recommend asphalt (bitumen-bound) because modern specifications and building standards favour it. If you need a tarmac surface laid in Cheltenham, local tarmac surfacing providers can advise whether traditional tarmac or modern asphalt best suits your site conditions.