Thank you to all who responded. As I am not the engineer on this, I couldn't answer as to why have thrust blocks at all. Howevr, it's spec'd out. Interestingly, the 4" SDR 135 pipe sat in the open trench over the weekend. Temps in the low 100's. Today the 45's and 90's had pulled away from the...
The contractor wants to wrap the PVC (4" sch 40 pipe w/sch 40 fittings) at the point of concrete thrust block contact. His reasoning is to prevent abraision at the point of contact. As an inspector, I see that since the wrap that is composed of 10 mil visqueen, with several wraps it becomes...