Drill holes in the concrete surface - that's how it works

For fastenings in the concrete ceiling, the holes are usually difficult to drill. With which devices and in what way the drilling works, and where there can be problems, can be read in this article comprehensively.

Possible problems

  • unsuitable drills
  • Reinforced concrete, reinforcement and steel beams
  • safety deficiencies

Unsuitable drills

The hardness of concrete does not allow drilling with ordinary drills. The material removal by the drill rotation is too low to achieve a greater penetration depth. For this purpose, the drill can quickly overheat and be damaged.

Percussion drills are usually also not suitable for drilling in concrete. The vibrations caused by the impact mechanism are usually too low to drive the drill into the concrete.

Only pneumatic impact drills - ie rotary hammers - with correspondingly high performance and suitable drills for concrete make drilling possible.

Reinforced concrete, reinforcement and steel beams

At certain depths, when drilling in reinforced concrete, one usually encounters the reinforcement. Rebars are between 6 and 12 mm thick and can be penetrated by two strategies.

  • Use special high-quality steel drills without hammer mechanism to pierce the metal
  • Slightly tilt the hammer drill. Powerful rotary hammers usually finish with reinforcements in this way.

For steel beams, it is only necessary to search for another drilling site.

safety deficiencies

One of the biggest accident hazards is insufficient stability. Ensure good position on the ladder, small indoor scaffolding is usually safer. Always guide the hammer with two hands.

Lack of protective equipment: Dust masks and goggles should be worn to prevent the inhalation of drilling dust or the ingress of splinters into the eyes. Gloves protect against burns on the hot drill, on the motor of the hammer drill or on hot concrete.

Holes in the concrete ceiling - that's how it works

  • concrete ceiling
  • ev. Water for cooling the drill
  • Hammer drill and matching drill
  • Ladder or scaffolding
  • protective gear

1. Mark the starting point for the drill

Mark the starting point for the drill with a pencil cross. Prepare the hammer drill, lay the cable without tripping and put on protective equipment.

2. Define drilling direction

Using light pressure and both hands, guide the hammer exactly vertically until the drill holds its own direction. Drill at a slow speed.

3. Piercing

If the drill holds the direction without drilling pressure to the desired depth. Pierce reinforcements as indicated above.

Tips & Tricks

The hammer must always be held with two hands. For this, an additional handle must be available. If the drill is tilted, the hammer can otherwise hit the face.