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Clean sanding of staircases and stair stringers

To enable smooth and thorough sanding of staircases and stair stringers, the right tool and the ideal abrasive are indispensable. This application example shows how easily you can sand wooden staircases – with instructions for precise renovation work and a perfect result.


    To sand a wooden staircase, you need a sander that provides a good coverage capacity and high material removal rate but can also reach into the corners and angles of the staircase and ensure clean sanding there.

    Festool's RO 90 is ideal for use when renovating a staircase. It has a powerful motor, which guarantees a high material removal rate, and the FastFix sanding pad replacement system, with which the sanding pad can be replaced without the need for tools. The sanding pads are available in six different designs. In addition, with the RO 90 sander, you can set the desired sanding level (coarse sanding, fine sanding, detailed sanding or polishing) of the staircase without having to change the tool.

    Weighing less than 1.5 kg, the RO 90 is also very light and therefore minimises fatigue when working on the staircase.


    • Changing the sanding pad

      To change the sanding pad, proceed as follows:

      • Turn the rotary switch on the top of the tool clockwise as far as it will go
      • Rotate the pad until it clicks into place
      • Rotate the pad by 45° anti-clockwise to release it from the catch
      • Insert the desired pad and secure it by rotating it anti-clockwise by 45°

      With the triangular sanding pads, press the green locking mechanism on the underside to release the pad. To sand off wooden surfaces, Festool recommends using RUBIN 2 abrasive. It is perfectly suited to wood and wooden materials and ensures a good surface quality. When sanding off coated surfaces, the Granat and Granat Net abrasives can be used.

      With triangular sanding pads, press the green locking mechanism to release the pad


    • At the start of the renovation work, use coarse sanding to remove old paint residue or coatings. To do this, turn the rotary switch on the top of the sander anti-clockwise. During coarse sanding, a lot of material is removed and you must ensure that the sander is guided evenly over the material surface.

      In the beginning, use coarse sanding to remove old paint residue or coatings.
    • When the surface has been neatly sanded off, the corners and edges of the staircase must still be sanded. To do this, turn the rotary switch to the right-hand position and switch to the Delta sanding pad. With its triangular shape, you can even sand the hard to reach places.

      After sanding the surface, sand the corners and edges of the staircase
    • When the edges and corners have also been sanded, you can begin the fine sanding process. To do this, turn the rotary switch to the centre position. During fine sanding, do not apply too much pressure to the tool, as otherwise the sanding pad is unable to rotate and the smearing motion of the ROTEX sander is no longer guaranteed. The tool's own weight is usually sufficient as application pressure.

      After sanding the edges and corners, fine sanding can be carried out.
    1. Our illustrated guides and work results are documented working steps that we have performed in practice. They are individual examples and do not guarantee or promise that users will obtain the same results. The results will depend on the user's experience and skill, as well as the material being used. Illustrated guides do not replace any Festool operating manuals and/or safety instructions. Liability for ensuring that the information, instructions and applications are free from content defects and defects of title, in particular with regard to the absence of defects, correctness, freedom from third party intellectual property rights and copyrights, completeness and fitness for purpose, is excluded. Claims for damages made by the user, regardless of their legal basis, are excluded. These liability exclusions are not applicable if the damage was intentional or caused by gross negligence, or in cases of statutory liability.

      We cannot accept liability for damage resulting from defects.