Where Cold water pipework may be concealed in a sleeve under a solid floor provided that the pipe is?

Cold water pipework may be concealed in a sleeve under a solid floor provided that the pipe is insulated to prevent condensation and potential water damage. The sleeve should allow for movement and expansion of the pipe, and it must be made of a material that is compatible with both the pipe and the surrounding concrete. Additionally, proper drainage should be considered to avoid any water accumulation.