Why does my bathtub drain so slowly?

A slow-draining bathtub is typically caused by hair and soap buildup in the drain or P-trap, though the issue could also stem from deeper blockages in your home's plumbing system. In Ottawa homes, this problem becomes more noticeable during winter months when we're taking longer, hotter showers and using more hair products.

The most common culprit is accumulated hair combined with soap scum and body oils that create a thick, sticky mass in your drain. Over time, this buildup restricts water flow, causing that frustrating slow drain. Hair is the primary offender - it catches on the drain stopper mechanism and creates a net that traps everything else flowing down the drain.

Start with simple solutions first. Remove the drain stopper (most lift out or unscrew) and clear any visible hair and debris. You can use needle-nose pliers or a drain snake tool to pull out the accumulated mess. For minor buildup, try pouring hot water down the drain followed by a mixture of baking soda and vinegar - let it sit for 30 minutes, then flush with hot water again.

If the simple cleaning doesn't resolve the issue, the blockage may be deeper in the P-trap or branch line. In older Ottawa homes (pre-1980s), cast iron drain lines can develop buildup or even partial collapses that restrict flow. Newer homes with PVC drains typically have blockages in the P-trap under the tub, which requires accessing the space below your bathroom.

When to call a professional: If you've cleared the visible drain and the problem persists, or if multiple drains in your home are slow, you likely have a deeper plumbing issue. Also, if you're uncomfortable removing the drain assembly or accessing plumbing under the tub, it's better to get professional help. In Ottawa's older neighborhoods like the Glebe or Westboro, we often find that slow drains are symptoms of larger plumbing issues that need proper diagnosis.

Prevention is key - use a hair catcher in your drain, rinse with hot water after each use, and avoid letting excessive hair products go down the drain. For persistent issues or if you're planning a bathroom renovation that could address underlying plumbing problems, contact Justyn Rook Contracting for a free consultation to assess your specific situation.