What type of backfill material is recommended for piping?

The recommendation for using a variety of backfill materials, such as clean sand, pea gravel up to 3/4" maximum, and crushed rock up to 1/2" maximum, is based on the specific properties and advantages each material offers in ensuring safe and effective installation of piping.

Clean sand is often recommended due to its ability to provide excellent drainage, reducing the risk of water accumulation around piping, which can lead to corrosion or damage over time. The grain structure of clean sand allows for easy compaction, ensuring that the backfill settles properly and provides adequate support for the piping.

Pea gravel, which typically is a smaller-sized aggregate, offers good drainage properties as well. Its smooth texture and round shape reduce the potential for sharp edges that could damage pipes. The 3/4" maximum size ensures that the gravel can effectively fill void spaces around the piping without compromising the structural integrity of the backfill.

Crushed rock, particularly at a maximum size of 1/2", provides a sturdy and stable base for piping. The angular nature of crushed rock promotes interlocking, which contributes to stability and reduces the likelihood of shifting or settling over time. Its drainage characteristics also help to prevent moisture accumulation.

Choosing a combination of these materials