Bedding sand for concrete should be spread and screeded to a nominal?

The recommended nominal thickness for bedding sand beneath concrete is typically around 1 inch. This thickness is vital because it allows for proper leveling and support of the concrete slab. A 1-inch layer provides sufficient flexibility to accommodate minor adjustments and settling while also ensuring that the surface is stable enough to prevent cracking once the concrete is poured.

Using a thicker layer, such as 2 inches or more, might lead to unnecessary material use and can create issues with the strength and durability of the concrete as it sets. Conversely, a thinner layer of 1/2 inch may not provide adequate support, leading to potential instability or uneven settling over time. Therefore, a nominal thickness of 1 inch strikes the right balance between support and practicality for laying concrete.