Overview: Fitting Dado Rail on Stairs

Fitting a dado rail on stairs involves a series of interconnected steps. Each step builds on the previous one, so it's important to follow them in order. Here's a quick rundown of the process:

1. Measure your stairs (rise and run)
2. Calculate the stair angle
3. Determine the mitre angle for joints
4. Choose the right height for your dado rail
5. Mark guidelines on the wall
6. Cut and fit your dado rail

Let's dive into each step, seeing how they connect to create a perfectly fitted dado rail.

1. Measuring Your Stairs

The first step in our journey is to measure your stairs. These measurements will be crucial for all subsequent calculations.

How to measure:

1. For the rise: Use a tape measure from the top surface of one step straight up to the top surface of the step above.
2. For the run: Measure from the front edge of one step (where it meets the riser) to the same point on the next step. Don't include any overhang in this measurement.

Note: The tread overhang or thickness doesn't factor into these measurements. Focus on the main structure of the stairs.

2. Calculating the Stair Angle

Now that we have our measurements, we can calculate the stair angle. This angle is crucial for determining how your dado rail will sit against the wall.

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Manual Calculation:

1. Divide the rise by the run (e.g., if rise = 20 cm and run = 25 cm, then 20 ÷ 25 = 0.8)
2. Use the arctangent (tan⁻¹) function on a scientific calculator: tan⁻¹(0.8) ≈ 38.7 degrees

This stair angle will be used in the next step to calculate your mitre angle.

3. Finding the Mitre Angle

The mitre angle is what you'll use to cut your dado rail pieces so they fit perfectly at the joints. This step involves two parts:

1. Joint angle: You can find this in the calculator above. Mnaually this is simply 180° minus your stair angle. For example, if your stair angle is 38.7°, your joint angle would be 180° - 38.7° = 141.3°.
2. Board widths: This is the width of your dado rail (Not the thickness or length). The calculator below will require Board A and Board B widths, measure the width of your dado rail and use this measurement for both board angles.

Now, use our Mitre Angle Calculator to find the correct mitre angle:

Enter the joint angle you calculated and use the same measurement for both board angles. The calculator will give you the correct mitre angle for cutting your dado rail at the point where they angle upwards.

4. Choosing the Right Dado Rail Height

The height of your dado rail should be consistent from your hallway or landing onto the stairs. To find the ideal height, use our Dado Rail Height Calculator, for wall height, enter the height of the wall preceding your staircase, this might be the hallway or landing area, alternatively enter the height of your standard walls for consistency around the house:

You don't have to use this calculator. If you have already chosen the height of your dado rail, simply use this measurement.

5. Marking Guidelines on the Wall

With your measurements and calculations complete, it's time to mark your guidelines. You'll need:

• A tape measure
• A spirit level
• A pencil
• A long straight edge or chalk line

Follow these steps to mark your guidelines:

1. Start at the bottom of the stairs, where your dado rail will begin to angle upwards. This is typically at the point where the bottom step meets the floor.
2. Measure up from the floor to your chosen dado rail height (e.g., 96 cm) and make a mark on the wall.
3. Move to each step, measuring the same height from the tread (not the riser) and marking the wall.
4. Use your spirit level to ensure each mark is level with the corresponding tread.
5. Connect these marks with a straight line using your straight edge or chalk line to create your guideline.

6. Cutting and Fitting Your Dado Rail

Now you're ready to cut and fit your dado rail:

1. Cut your dado rail pieces to length, ensuring they fit between any obstacles (like newel posts).
2. Use the mitre angle you calculated earlier to cut the ends of each piece where they'll join, you can use the mitre angle calculator for all the joints, to ensure precise angles.
3. The joints between dado rail pieces should ideally be positioned at the point where a step meets the riser. In other words, your dado rail should be consistent in height at all points and should not dip below the specified height at any joint.
4. Test fit your pieces along the guideline you marked.
5. Once you're happy with the fit, secure the dado rail to the wall using appropriate fixings.

For detailed instructions on attaching your dado rail to the wall, check out our comprehensive dado rail fitting guide.

Don't overthink it!

Fitting a dado rail on stairs might seem challenging at first, but by following these steps, you can achieve a professional-looking result.

• Your stair measurements inform your angle calculations
• Your angle calculations determine your cutting angles
• Your chosen height guides your wall markings
• Your wall markings direct your fitting process

Take your time with each step, double-check your calculations, and soon you'll have a beautifully installed dado rail enhancing your staircase!

If you need any dado rails or accessories for your project, don't forget to check out our range: