06/06/2026
Ever wondered what type of drainage pipes are buried beneath your property?
At PipeX, we regularly investigate drainage systems across Wellington and often find pipework from several different eras. Understanding the age and construction of your drains can help explain recurring drainage problems.
🔹 Before the 1970s
Most residential drainage systems were installed using earthenware (clay) pipes joined with cement mortar. While these pipes were durable and served generations of homeowners well, the rigid joints could crack over time due to ground movement, allowing tree roots and groundwater to enter the system.
🔹 The 1970s
Earthenware pipes remained widely used, but the industry began moving away from cement mortar joints in favour of rubber ring joints. This improvement allowed for greater flexibility, better sealing, and reduced the likelihood of joint failure caused by settlement or movement, initially. Unfortunately, now days this rubber is very brittle and prone to leaking. As these fittings leak, water undermines the drain by eroding away the soil which reduces the support of the drain. This results in moved pipework which can cause you all sorts of problems!
🔹 The Introduction of PVC
PVC drainage pipes eventually became the preferred solution for residential drainage. Their lightweight construction, smooth internal surface, extra length between joins, corrosion resistance, and flexible jointing systems helped improve reliability and installation efficiency. Today, PVC remains the most common drainage material used in New Zealand homes.
⚠️ If your Wellington property was built before the 1990s and you’re experiencing:
• Frequent drain blockages
• Slow-draining fixtures
• Gurgling sounds from plumbing fixtures
• Wet areas appearing in the lawn
• Tree root intrusion
It may be time for a CCTV drainage inspection.
At PipeX, we help Wellington homeowners identify drainage issues, locate ageing pipework, and provide practical solutions before minor defects become costly repairs.
Need advice about your drainage system? Get in touch with the PipeX team.
www.pipex.co.nz
Reliable plumber in Wellington for plumbing, gasfitting & drainlaying. Clear advice, quality workmanship & fast service. Get a quote today.