Q: What is the recommended backfill material and gradation (particle size) for fiberglass pipes?

A: Similar to conventional piping, fiberglass requires a stable backfill which is neither soft and silty or sharp and large, such as rocks. ASTM D2487 and AWWA M45 have very good guidelines on this and ideal backfill is reiterated in FPI installation catalogues.

We use cookies to collect information to ensure your experience of the site, and our ability to improve it is enhanced. For more information please visit our Cookies statement. Your continued use of this website indicates your acceptance of and consent to our use of cookies as described in our Cookies statement.