ISO/TS 7024:2005 gives the recommended practice for installation of thermoplastic piping systems in the field of soil and waste discharge (low and high temperature) inside buildings (marked with "B").

ISO/TS 7024:2005 is applicable to thermoplastic pipes and fittings as specified in the associated standards ISO 3633 (PVC-U), ISO 7671 (PP), ISO 7682 (ABS), ISO 8770 (PE-HD), ISO 19220 (SAN+PVC) and ISO 7675 (PVC-C), their joints and to joints with components of other plastic and non-plastic materials intended to be used for the following purposes:
1.soil and waste discharge pipework for the conveyance of domestic waste waters (low and high temperature);
2.ventilating pipework associated with 1);
3.rainwater pipework within the building structure.

If specified in the relevant associated standard, ISO/TS 7024:2004 also covers soil and waste discharge pipework fixed externally on to the building. It is not applicable to pipework that passes under the building without any connection from the discharge system.