Which type of piping can be buried underneath a building to eliminate transition fittings being outside?

Choosing polyethylene (PE) piping for installation underneath a building is rooted in its durability and flexibility, which allow it to be used effectively in various underground applications. PE piping is known for its resistance to corrosion and chemicals, making it well-suited for buried installations where it may be exposed to soil and moisture. Additionally, PE is flexible enough to accommodate ground shifts, reducing the risk of cracks or breaks—something particularly important in underground settings.

Using PE can help in streamlining the piping design by minimizing the use of transition fittings, which are often required for different types of materials. By using a single type of piping material throughout the underground section, you can avoid potential leaks and complications that can arise from having multiple materials and fittings exposed to moisture and ground conditions.

Other options, while useful for different applications, may not offer the same benefits for underground installation. PVC, for instance, is rigid and can be more susceptible to cracking under pressure or ground movement. CPVC, while also good for hot water applications, shares similar rigidity concerns. ABS is not commonly recommended for underground use because of its tendency to weaken when exposed to certain solvents and chemicals found in the soil.

Thus, polyethylene's ability to withstand underground conditions while reducing the necessity for additional fittings makes it