Occupational Safety During Honing: Dust, Noise, Electricity and Slipping

Seen from the outside, stone honing looks like a calm job: a machine turns slowly across the floor and leaves a shining surface behind it. On site, however, many hazards exist at the same time. The floor is covered with water and slurry, electrical cables run across the same floor, the machine is loud, dust and chemicals are used at certain stages, and heavy equipment is carried up the stairs. These risks concern not only the crew, but also the family living in the home, the people working in the office and the neighbor downstairs. In this article we cover the main hazards on a honing site, the precautions needed against them, and the points a homeowner or building manager can check for themselves when having the work done.

In short: The most serious risk in honing is electricity on a wet floor; this is why residual current protection, sound cables and sound joints are indispensable. In addition, you need suitable protective equipment, control of noise and dust, use of chemicals in accordance with their safety data sheets, and separation of the work area from people nearby. These topics should be discussed before the work starts.

The Risks on a Honing Site Occur Together

On a construction site, hazards are usually spread across different places. In honing, they are all concentrated in the same area of a few square meters. In wet honing, the floor is constantly wet and stone slurry is as slippery as soap. The machine and the vacuum run on electricity, and their cables also run across this wet floor. Noise rises at the coarse grit stages, dust is generated in dry work, and chemicals come into play at the polishing and impregnating stages. On top of that, the work is often carried out in a home that is in use, an open office or a hotel that operates at night.

This picture shows that safety cannot be ensured by a single measure, but by a system. In Turkey, Occupational Health and Safety Law No. 6331 requires the employer to assess risks, take precautions and inform employees to ensure their safety. The honing company must fulfill these obligations for its own crew; if the work is done at an institution, coordination with the institution's own safety system is also part of the job. For details, consult an occupational safety specialist and the current legislation.

Water and Electricity: The Most Serious Hazard

The most serious risk of wet honing is electric shock. In a wet environment, the human body's resistance to electricity drops, and even a leakage current that would normally go unnoticed can become dangerous. A crack in the cable insulation, a joint that has fallen into water, or a socket without grounding can transmit current through the water on the floor to the person operating the machine.

The most important precaution against this risk is that the machine and the vacuum are supplied from a line with a life-protection residual current device. In electrical installations, a 30 milliamp residual current device is used for life protection. If it is not known whether the building's installation has such protection, the crew should bring its own portable distribution box with residual current protection. In addition, the main points to watch are as follows:

• Sound cables: The insulation of extension cables must be free of cracks, cuts and crushing; a cable repaired with tape must not be used on a wet floor.
• Joints above the floor: Cable joints and the distribution box should be kept at a height that water cannot reach, for example on a stand or a hanger.
• Protecting sockets: Wall sockets in the work area and electrical outlets at baseboard level should be covered with tape and plastic sheeting against water and slurry.
• Cable route: Behind the machine, the cable should be run, if possible, along the wall and away from the walkway, not through the wet slurry.

If there is any sign of a problem, for example if the fuse trips often, or if heating in the cable or sparks at a joint are seen, the work must be stopped immediately and must not be restarted until the cause is found. A tripped fuse is not a malfunction; it is often a warning.

Personal Protective Equipment

The crew's equipment is chosen according to the hazards on site. In wet honing, waterproof boots with non-slip soles protect the feet from wetness and keep the person from slipping in the slurry. Eye protection is necessary against slurry splashed by the machine and droplets splashed during chemical applications. Gloves vary by task: a work glove that provides grip for machine use, and for chemical work a chemical-resistant glove of the type specified in the product's safety data sheet.

Hearing protection and respiratory protection come into play depending on the stage and method of the work. If dry cutting, dry honing or dry sanding is performed, a suitable respirator must be used, especially on surfaces containing granite and quartz. We covered the details of this topic in our article on silica dust in dry honing Protective equipment is not enough just by being available; it must be the right size, kept clean and actually used.

Another piece of equipment that is rarely discussed is the kneepad. Wall edges, corners, steps and door thresholds are worked with hand machines, often while kneeling. Working on your knees for hours on a wet, hard stone floor both tires the knee joints and can cause injury because of small stone fragments in the slurry. Waterproof kneepads and regular breaks protect the crew's health, especially on days when step and baseboard work is heavy.

Noise and Vibration

Honing machines, especially at coarse grit stages and when working with metal-bond diamonds, can produce noise at levels that may damage hearing after long exposure. In Turkey, the Regulation on the Protection of Employees from Noise-Related Risks defines three thresholds for an eight-hour daily exposure: 80 dB(A) is the lower exposure action value, 85 dB(A) is the upper exposure action value, and 87 dB(A) is the exposure limit value. At the action values, the employer's obligations to take precautions and provide hearing protection begin. Since which machine produces which noise level varies by model, grit stage and environment, actual exposure is determined by measurement.

Noise affects not only the crew but also the surroundings. In apartment buildings, machine noise and vibration can be clearly heard on the floors above and below. Therefore, working hours should be discussed in advance with the management and the neighbors, and the coarse grit stages should be scheduled at suitable times of the day. For crew members who operate machines for long periods, rest and job rotation between grit stages also reduce the vibration load on the hands and arms.

Dust, Slurry and Waste

Wet grinding binds most of the dust, but it produces stone slurry in its place. This slurry is slippery, turns to dust as it dries, and spreads easily under doors, through joints and behind skirting boards. Collecting the slurry with a vacuum at frequent intervals keeps the floor visible and reduces the risk of slipping. The collected slurry must not be poured into the sink, the toilet or a storm drain; the sediment can clog pipes. How the slurry will be disposed of should be discussed before the work begins.

With the dry method, the main risk is dust. If dry grinding is done without a dust-extraction machine and an industrial vacuum with a suitable filter, fine dust spreads throughout the whole house and gets inhaled. We covered the differences between the methods in terms of dust, water and noise in detail in the comparison of wet and dry grinding in detail.

Chemicals: Crystallizer, Acid and Solvent

Different chemicals are used in the final stages of grinding and during maintenance. Crystallization products may contain acidic components; they can cause irritation on contact with skin and eyes. Stain removers and some cleaning products can be strongly alkaline or acidic. Solvent-based impregnators and some adhesives produce dense vapors in enclosed spaces. A safety data sheet must be available with every product, and the crew must know the protective equipment and ventilation conditions stated on it. We explained the chemistry of crystallization in our article on crystallization as well.

The most dangerous mistake with chemicals is mixing products. For example, combining bleach with an acidic cleaner can release toxic gas. For this reason, products should be kept in their original, labeled containers, never be decanted into empty water bottles, and different products should not be used one after another in the same bucket. In an area where a solvent-based product is applied, there must be no open flames, cigarettes or devices that can produce sparks, and the area must be well ventilated during and after application. In homes, make sure that children and pets cannot reach the chemical containers.

Slipping, Transport and Ergonomics

While trying to make other people's floors safe, the grinding crew is constantly at risk of slipping on the floor it works on. Stone slurry is even more slippery than a polished floor. Non-slip boots, frequent collection of slurry and keeping cables on an orderly route are important for the crew's own safety as well. Pulling the machine while walking backwards on a wet floor is one of the most common slipping and falling situations.

Transporting the equipment is a separate risk. Grinding machines are heavy and are often carried up stairs and through narrow doors and elevators. Disassembling the machine for transport, lifting it with at least two people, and using a ramp or hand truck on stairs prevent back injuries and falls. We explained that machine choice also affects ease of transport in our article on choosing a grinding machine as well.

People Nearby and the Premises

Grinding is often carried out in a place where people live or work. At home, children and pets should be kept away from the work area, and if possible the door of the room where the work is being done should be closed. In offices and hotels, the work area should be separated with tape and warning signs, and cables should not cross walking routes. When the wet floor will be safe to walk on should be stated clearly before the crew leaves the area.

The premises themselves must also be protected. In wet grinding, water and slurry can leak to the floor below through joints and utility openings. This risk is higher in old buildings, on stone floors laid over wooden flooring, and in bathrooms with many pipe penetrations. Checking the ceiling of the floor below for traces of moisture before starting work, and repeating the same check after the work, allows a possible leak to be noticed early.

Points the Customer Can Check

You don't have to know the technical details of the work, but by checking a few simple points you can get a good idea of the safety setup on site. In corporate projects, adding these points to the technical specification puts expectations in writing from the start; we explained how to prepare the specification in our article on the floor grinding technical specification as well.

The table below summarizes the main points you can check before and during the work:

Asking these questions does not mean distrusting the team doing the work; on the contrary, a team that works in an orderly way already has the answers ready. When planning your project, if you send us the size of the area, its usage, and any special conditions through the service request form we can also discuss the safety arrangements together during the site survey.