Domestic Robots
Two fears stop people buying a robot vacuum for nice floors. One is scratches on sealed hardwood. The other is a machine that treats a black rug like a hole in the earth and refuses to go, or worse, sulks at the threshold. They are different problems. Spec sheets that only shout suction ignore both.
This is not the carpet-versus-tile pickup guide. That is carpet vs hard floors. This is damage and dark-floor behaviour on Roomba-class and Deebot-class discs.
ⓘ Quick Answer
A clean robot on clean sealed wood is unlikely to claw the finish. Grit in the wheels, a damaged caster, or a dripping mop on the wrong finish is what marks floors. Dark carpets can confuse cliff sensors; always test the darkest rug. Soft, unfinished, or waxed wood is a different risk — check the manufacturer and your floor, not a forum.
Scratches are usually dirt, not the robot
The shell is plastic. The crime is sand in the roller and stones in the caster. Run a robot over grit and you have a tiny mill. Sweep obvious debris after a garden day. Check wheels for embedded gravel. A rubber brush is kinder to finish than a chewed bristle roller full of grit.
- Sealed hardwood and laminate: usually fine if you maintain the robot.
- Soft pine, wax, or unfinished: pause and ask the floor brand.
- Mopping: light damp dusting is not flooding. Combos can leave water where you did not want it.
Dark floors are a sensor problem
Cliff sensors look down for a drop. Very dark rugs and some black thresholds look like a drop. The robot may refuse the rug, spin, or (rarely, on badly designed units) think a stair is safe. This is why people say “it will not vacuum my black runner.”
💡 What to Check
Place the robot on the darkest rug in daylight and in evening lamps. If it panics, that rug is a no-go zone, or you need a model with a documented dark-floor mode. Do not assume LiDAR fixes downward cliff logic. See lidar vs camera for navigation, not for cliffs.
A practical test before the return window ends
One supervised run on the nicest wood and the darkest textile. Inspect caster and side wheels. If you mop, watch the pale oak. If anything looks wrong, stop and use no-go zones. Compare Roomba and Deebot on Robot.help as floor machines, then believe your floor more than the advert.
Floor-fear checklist
Run this before you trust a schedule
- Are the wheels clean, and is the caster spinning freely?
- Did it cross the darkest rug without treating it as a cliff?
- Is the finish sealed, or is this wax I should not wet?
- Can I set a no-go if the runner wins?
Final Thoughts
Fear the grit and the black runner, not the disc. Then pick a vacuum whose mop and sensors match the house you have.
Frequently Asked Questions
Will it scratch engineered hardwood?
Usually not if sealed and the robot is clean. Grit and a damaged wheel are the usual villains.
Can I cover cliff sensors with tape?
Do not. You would be disabling the feature that stops it falling down stairs.
Is mopping safe on wood?
Only as the manufacturer and your finish allow. Light damp is not a bucket.