Can I put a tub and shower on the same drain?

Yes, you can connect a tub and shower to the same drain line, but this requires careful planning and proper sizing to handle the combined water flow and meet Ontario Building Code requirements.

Drain sizing is critical for a tub-shower combination. The drain line must be sized appropriately to handle the maximum flow from both fixtures simultaneously. In Ontario, this typically means a minimum 2-inch drain line, though 3-inch is often preferred for better flow capacity. The trap configuration also needs proper design - you'll need individual traps for each fixture that connect to the main drain line downstream.

Plumbing rough-in considerations include ensuring adequate slope (minimum 1% grade) on the drain line and proper venting. The Ontario Building Code requires each fixture to be properly vented, which may mean additional vent lines depending on your bathroom layout. Waterproofing becomes even more important with multiple water sources - the entire area needs proper membrane installation and careful attention to transitions between the tub and shower areas.

In Ottawa's older homes, existing drain lines may not be sized for dual fixtures, requiring upgrades during renovation. The floor structure may also need reinforcement to support both a filled tub and the additional plumbing. Permit requirements apply since this involves significant plumbing modifications - your licensed contractor will handle the permit application and ensure code compliance.

Design-wise, consider the practical layout for cleaning and maintenance access. Many homeowners find that separate shower areas with glass enclosures help contain water better than combination setups. Heated floors work particularly well in these larger bathroom spaces.

For a project like this involving significant plumbing modifications, you'll want to work with experienced bathroom renovation contractors who understand both the technical requirements and permit process. Want to discuss your specific layout? We offer free consultations to review your space and requirements.