---
title: Trust but Verify
description: Not all pipe types are the same. Flexible pipe requires a strong side-fill to develop strength. Rigid pipe provides the strength within the pipe wall composition.
---

[ACPA Resources ](https://resources.concretepipe.org)

# [Trust but Verify](https://resources.concretepipe.org/trust-but-verify)

 Written by [Installation](https://resources.concretepipe.org/author/installation) | 10/18/22 6:48 PM

## Trust but Verify: For Users and Specifiers

Not all pipe types are the same; neither are their design assumptions. Flexible pipe requires a strong side-fill to develop strength as it shortens vertically, deflecting outward to engage the side fill as a column to carry some of the vertical load; and as a bearing to resist horizontal deflection. Rigid pipe relies very little on the horizontal support given by the side-fill soils, and provides the strength within the pipe wall composition. Based on this difference, installation assumptions should not be the same.

 

[View full post](https://resources.concretepipe.org/trust-but-verify)

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