Hi meanttobeworking If the soil pipes are below ground they should be surrounded by pea shingle to prevent sinkage. If they are above a surface, like on the oversite they should be supported at the manufacturers specified intervals. The bowing of the pipes is not going to improve with time, let the developer investigate and if they try and BS you, start kicking. NHBC will not be interested if the development is under 3 years old so you may have to approach whoever did the building control approval. Regards S
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