11/6/2023 0 Comments Pex connectors![]() Bury the tubing below the frost line to prevent water from freezing in the pipes. Embedding the tubing in the sand once it is buried can help prevent damage from rocks and soil. Luckily, because the PEX tubing is being buried in this scenario, it won’t degrade from UV light as long as you limit its exposure to the sun prior to installation. Since PEX tubing isn’t the cheapest pipe option, costing anywhere between $1.75 and $7.50, a severely shortened lifespan is not ideal. This means that if the tubing is exposed to the sun, it will break down much faster. Some individuals are wary of using any type of PEX tubing outdoors because it degrades under UV light. PEX-B is the first choice for burying due to its higher bursting pressure and reduced issues with leached chemicals. What Type of PEX Can be Buried?Īlthough you can generally bury PEX tubing, some tubing types will have a longer lifespan than others underground, especially when used to transport water in freezing conditions ( source). There’s a few key things you need to understand so let’s dig into PEX tubing and fittings in terms of what type works best underground. My brother-in-law and I have used PEX tubing in our last three homes including buried line to the underground water main. Additionally, PEX tubing materials allow for expansion, making them resistant to freezing/cracking underground. ![]() Burial also reduces sun exposure, which would otherwise degrade the piping. ![]() PEX has a life expectancy of 40-50 years, made possible by its durable and non-corrosive materials. PEX tubing is approved for direct burial outdoors. Nowadays, PEX tubing is quickly replacing traditional copper and galvanized steel pipes and is an exceptional option for underground piping. This tubing is typically used for domestic or building service pipes, hydronic systems, and insulation for electrical cables. Cross-linked polyethylene, also known as PEX, is a lightweight and durable polyethylene thermoplastic with cross-links.
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