Fitting a Freestanding Bath onto a Concrete or Solid Floor

When installing a freestanding bath on a concrete or solid floor, there are a few key considerations to ensure a smooth and practical installation. By solid floor, we mean one with no cavity beneath it for waste pipes—this includes concrete floors and floors where the boards also serve as the ceiling of the room below (often found in older buildings).

1. Creating Space for the Trap

Since there’s no space within the floor for the waste kit, you’ll need to ensure there’s enough clearance between the bath’s base and the floor to accommodate a bath trap and waste pipe.

2. Planning the Waste Pipe Route

Once you’ve selected a suitable shallow trap, the next step is figuring out how to lead the waste pipe out from under the bath. The method depends on whether your bath has feet or sits flush to the floor.

3. Installing Different Bath Types on a Solid Floor

A. Baths with Feet

Most freestanding baths with feet provide 12-16cm of clearance between the bath’s base and the floor—plenty of room for a shallow bath trap and outlet waste pipe.

🔹 Key considerations:

Use an ultra-shallow bath trap for best results.
The waste pipe can exit in any direction—except back toward the overflow pipe. This prevents interference, as the trap rises to the same level as the overflow connection.

B. Baths Without Feet (Floor-Standing Baths)

Floor-standing freestanding baths, particularly stone cast resin baths, often have no cavity between the inner and outer layers, meaning there may be no space for a waste kit underneath.

🔹 Check before purchasing:

Many contemporary freestanding baths come with a pre-fitted waste kit.
Some may have minimal clearance between the bath’s base and the floor, making it impossible to fit a trap underneath.

📞 Contact us before purchasing to confirm whether your chosen bath can be installed on a solid floor.

4. How to Lead the Waste Pipe Out from a Floor-Standing Bath

If your bath has enough clearance for a waste trap but sits flush to the floor, you’ll need to cut a hole in the bath’s base to allow the 40mm waste pipe to exit.

🔹 For acrylic or fibreglass baths, this can be easily done with a hacksaw or similar tool.

If cutting a hole isn’t possible due to the bath’s construction, you’ll need to consider alternative installation methods, such as raising the bath on a plinth.

5. Raising the Bath on a Plinth

If your bath doesn’t provide enough space for a waste kit, an effective solution is to build a plinth or platform for it to stand on.

🔹 How to create a plinth:

Construct a timber frame with a backing board.
Tile or finish it to create a stylish and seamless feature.
Ensure the plinth is high enough to accommodate the waste trap and pipe.

This option allows you to install a floor-standing bath while maintaining a clean, elegant aesthetic.

Need Help? Contact Us!

If you're unsure whether your chosen bath can be installed on a solid floor, or if you need guidance on waste kit options, we're happy to help.

📞 Call us on 07535 167 912
📧 Email sales@classicalbaths.co.uk