Hydration and Heat

Construction worker in an orange safety vest wiping sweat from his forehead beside an excavator at a hot worksite

Can a Heat Safety Card Save a Life?

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Heat exhaustion is potentially fatal at the worksite, as it can progress to heat stroke if it is not recognized and treated right away. The goal for safety personnel is to make sure workers are protected from heat dangers, and a heat safety card is a practical tool for keeping that protection in the worker’s hand.

There are several heat safety measures employers can take to reduce the risk of dehydration and, by extension, heat illnesses like heat exhaustion. One of those measures is equipping workers with TWIC-sized heat cards, printed in the same credential size many industrial sites already issue, and capable of tracking ambient temperature.

In This Article

How Do Heat Safety Cards Keep Workers Safe from Heat Stress?

If heat is a potential hazard at your worksite, you are required to protect workers under OSHA’s General Duty Clause. Standard heat safety measures include developing a heat safety and emergency plan, setting up water break stations, monitoring worker health, and adjusting work rotations when conditions are dangerously hot.

In addition to those measures, employers can equip workers directly by supplying them with heat safety cards. Here is what these cards offer:

  • Heat Aware's Heat Cards - HATS40 | Avoid heat-related illnesses for workersLiquid crystal thermometer (LCT) technology – Liquid crystal thermometers provide a rapid, accurate temperature reading. They can be built into a TWIC-sized card, so workers always have a temperature-taking tool on hand. The best defense against dehydration and heat exhaustion is information, and an LCT card gives your field personnel direct insight into heat levels where they are standing.
  • Critical heat safety information – Your heat safety cards can be printed with other reference details, like hydration guidelines, the warning signs of heat illness, or onsite emergency contact information.
  • Additional branding opportunities – Cards can also carry your company’s brand marks, which reinforces your organization’s commitment to safety every time a worker looks at one.
  • A lightweight, usable safety tool – Heat safety cards are extremely light and compact, and they fit an existing badge holder or lanyard. They are also simple to use, so they deliver consistent value to safety initiatives.
  • A cost-effective safety tool – Heat safety cards are inexpensive to produce at volume and can be laminated for added durability. That makes it easy to outfit an entire crew rather than a handful of supervisors.

Heat illness is preventable when it is recognized early and acted on. A card does not do that work by itself. What it does is put the temperature and the warning signs in a worker’s hand at the moment those things matter, which is what makes early recognition and a fast response possible. For a modest investment, many employers find it is worth outfitting their workers with that awareness. Our breakdown of how these cards add value goes deeper on the cost side.

How Do Heat Safety Cards Help Workers Recognize Dehydration and Heat Exhaustion?

Heat Aware's Heat Cards - HATS-20A | The signs, symptoms and treatment of heat illnessesHeat safety cards are meant to be worn on a lanyard or carried in a pocket for easy reference when temperatures climb. They act as a reminder of the signs to look for and what to do when heat illness emerges, and nothing matters more than recognizing what is happening and taking immediate steps. That means knowing the signs of dehydration and heat exhaustion.

Signs of Dehydration

  • Persistent thirst
  • Fatigue
  • Dizziness and loss of coordination
  • Confusion
  • Loss of skin turgor, where skin does not return to its original position after being pulled

Dehydration is a primary risk factor for heat illnesses like heat exhaustion and heat stroke. Conversely, regular hydration is one of the strongest protective measures available. If your personnel are not adequately hydrated, it can lead to heat exhaustion, which presents with the following symptoms.

Signs of Heat Exhaustion

  • Fatigue
  • Dizziness
  • Fainting
  • Nausea and vomiting
  • Headache
  • Elevated body temperature

Dehydration and heat exhaustion present with similar signs, so it is not always clear which one is causing symptoms. Both are treated in similar fashion: move the worker to a cool, shaded area, give them water, and use any available resources to lower body temperature, including cool packs and wet cloths. It is also important to seek medical treatment during or following a bout of heat illness, because it can escalate quickly and cause long term complications or even death. Training your crew to recognize heat stress on the jobsite is what turns a card into a response.

Prioritize Heat Safety with Better Tools and Better Safety Procedures

Heat is invisible, odorless, and can intensify gradually without notice, so it can produce an emergency quickly. That is why it is important for employers to establish a heat safety plan ahead of time. A plan should include:

  • Identifying any potential heat hazards at the worksite
  • Acquiring and inventorying heat safety resources, including heat safety cards, cold packs, and electrolyte tablets
  • Monitoring worksite conditions for changes in temperature
  • Altering work schedules or switching to light duty
  • Recording contact information for a nearby medical facility

Heat Aware's Heat Cards | HATSC-30: The Custom Twic Sized Card | Keep workers safe from a heat-related illnessEmployers who combine these measures give their workers the best available protection against heat risks. If you are responsible for safeguarding worker health onsite, heat safety cards and the procedures around them are a straightforward place to start. Our guidance on building a heat safety plan covers the emergency action plan side in more detail.

Heat Aware Cards are available in standard, labeled, and fully custom versions in our online shop. For pricing, availability, volume orders, or a card branded for your company, contact Bryan Slaven at bryan@heataware.com.

Frequently Asked Questions

What is a heat safety card?

A heat safety card is a durable reference card printed in the same TWIC credential size that many industrial sites already issue, so it fits an existing badge holder or lanyard. It carries heat safety information such as warning signs and hydration guidance, and some versions include an integrated liquid crystal thermometer for reading ambient temperature. It is not a TWIC credential and does not serve any identification or access purpose.

What is a liquid crystal thermometer?

A liquid crystal thermometer, or LCT, is a simple temperature-taking tool that provides a rapid, accurate reading. LCTs use thermochromic liquid crystals that change color as temperature changes, and they can be encapsulated and scaled down to fit inside a TWIC-sized card, which gives workers temperature monitoring wherever they are working.

Who can benefit from carrying a heat safety card?

Anyone who works where heat hazards are present. Construction and maintenance crews are the most common examples, and workers in manufacturing, refineries, bakeries, industrial settings, and commercial kitchens face the same exposure. Athletic programs use them as well, since heat illness risk on a practice field follows the same pattern as it does on a jobsite.

Can a heat safety card be branded for our company?

Yes. Cards can be printed with your company’s brand marks along with the reference information your crews need, such as onsite emergency contacts or your own heat response thresholds. Contact Bryan Slaven at bryan@heataware.com to discuss a custom or branded card for your operation.

Five Ways to Improve Hydration in Heat and Keep Workers Safe

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Keep Your Workers Safe with Proper Hydration

In 2013, there were more than 16,000 reports of heat illness that were serious enough to result in at least one day of missed work, according to the U.S. Office of Compliance. Among those reports, there were 38 fatalities due to heat illness. It is up to employers and supervisors to prevent these potentially-fatal outcomes, and the Occupational Safety and Health Administration, or OSHA. OSHA’s General Duty Clause requires employers to provide a place of employment that is free from recognizable hazards.

Heat is a recognized danger, but employers can counter it by keeping their workers cool and hydrated.

Five Ways to Improve Hydration in Heat

As workers exert themselves, they rapidly lose water in the form of sweat. This is a critical means of controlling body temperature, and without constant rehydration, it’s a mechanism that eventually fails. Once the body can no longer control its temperature, heat illness is imminent, so it’s critical that it never gets to this point. Here’s how employers can ensure their workers are safe from the heat at all times:

  1. Verify that workers are rehydrating – It’s common for workers to neglect rehydration while focused on completing a task. Dehydration is something that usually emerges slowly, so workers may not realize how dehydrated they are until it starts causing problems. This is why workers shouldn’t be the only line of accountability when it comes to hydration.
    Employers can learn a lot just by observing their employees and determining which ones are neglecting rehydration. Many of these workers would be happy to take a break and rehydrate, but they may not realize how often they need to replenish their fluids. Employers can use reference materials, which may be as simple as a laminated card, to remind workers when it’s time to take a break.
  2. Keep track of changing weather conditions – Even a difference of a few degrees may make the difference where heat illness is concerned, so keep an eye on the thermometer. Even better, give each worker a way to keep track of the temperature so they know when they need to rehydrate more frequently. For example, when the heat index climbs above 90 degrees Fahrenheit, workers will need between 12 and 24 ounces of fluid every hour to remain hydrated. When the heat index rises above 100 degrees Fahrenheit, though, workers will need to double or triple their water intake to stay hydrated.
    If workers have their own temperature-keeping device on hand, they can react to climbing temperatures right away, and hydrate accordingly.
  3. Make use of shade – Drinking water and replenishing electrolytes are essential elements of staying hydrated, as is reducing temperatures when possible. It’s highly recommended that there is a shaded rest area on every worksite, even if that shade is provided by a tent. In fact, tents typically make the perfect shade solutions because they can be moved around when it’s convenient to do so. Tents are also a valuable source of shade when there are no other sources of shade to be had. Consider setting up a hydration station inside the tent, along with air movers to circulate air and improve cooling.
  4. Use cooling equipment – Keeping workers cool is one way to keep them hydrated, so any tools that improve cooling efforts are tools worth investing in. They don’t have to be expensive or complicated devices, either. For instance, a simple neck wrap can be soaked in cool water and applied to wick heat away from the worker. These neck wraps are inexpensive and can be used over and over. They also help workers remain comfortable as well, which enables better, more reliable performance while on the job.
  5. Know the signs of dehydration – Dehydration isn’t just a danger to the worker. Once dehydration sets in, job performance suffers greatly, to the point where the worker may become a safety risk to themselves and those around them. According to a 2015 study published by Loughborough University, being dehydrated is the equivalent of being legally drunk when evaluating job performance. Even a modest amount of fluid loss (2 to 3 percent of the body’s total) is enough to induce considerable fatigue.
    Dehydration can produce a range of symptoms, including headaches, tiredness, dizziness and an inability to concentrate. Perhaps the most obvious sign of dehydration is dark urine color. When urine takes on a darker hue, as in darker than apple juice, it’s frequently due to dehydration and reduced fluid in the urine.
    There should always be someone on the worksite to spot any signs of severe dehydration or heat illness. Oversight in this area will hopefully stop instances of dangerous dehydration before they progress into medical emergencies.

Hydration is vitally important in protecting workers from harm while on the job. It’s up to employers, then, to implement these hydration safety methods and ensure their workers are prepared to meet the summer heat.

Hydration and Avoiding Heat-related Illnesses

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Hydration is the best defense against heat-related illnesses

Heat-related illnesses, most often in the form of heat exhaustion and heat stroke, are serious threats to worker safety. Every year, excessive heat kills dozens of U.S. workers, and incapacitates many more. Although it doesn’t have to be this way because with proper education, monitoring and worker safety procedures, heat illness can be avoided. It’s critical that serious heat illness be avoided on job sites because even if a worker is revived, they can face long-term complications that can affect their quality of life.

Ideally, worksites should be equipped with plenty of educational and reference materials so workers are constantly reminded of necessary precautions regarding heat. It is essential that site managers have this knowledge down pat so they can make sure their crew takes proper precautions when outside temperatures and heat indexes climb to dangerous levels.

A frontline approach to avoiding heat exhaustion or heat stroke is frequent hydration. Hydration will not guarantee workers are safe from heat-related illness, but it will provide a strong measure of protection. This is what proper hydration looks like:

  1. Less than 90 degrees Fahrenheit – No work restrictions or fluid intake measures are required. Intake fluids as needed and rest as needed.
  2. Between 90 and 94 degrees Fahrenheit – Workers should rest 10 minutes out of every hour and take in between 12 and 24 ounces of fluid.
  3. Between 95 and 99 degrees Fahrenheit – Workers should rest between 10 and 20 minutes out of every hour, depending on how strenuous their job is. Fluid intake should measure between 24 and 36 ounces every hour.
  4. Between 100 and 104 degrees Fahrenheit – Rest at least 20 minutes every hour, and more if needed. Take in 36 to 48 ounces of water every hour.
  5. Between 105 and 109 degrees Fahrenheit – Workers should get at least 40 minutes of rest hourly and take in between 36 and 48 ounces of water per hour.

When temperatures rise above 109 degrees Fahrenheit work should only proceed under the watchful eye of Health and Safety professionals.

As outlined above, extensive hydration is needed to maintain safety, and it should be reinforced with clear reference heat cards, heat index posters and the like.

The importance of avoiding heat-related illness

Athletes and workers in demanding, labor-intensive fields, such as construction and landscaping, are most often affected by heat exhaustion and heat stroke. Among athletes and laborers, there is often a sense of powering through the job, even when symptoms of heat exhaustion begin to emerge. This can prove to be fatal and should be strongly discouraged. Instead, the symptoms of heat exhaustion and heat stroke should be constantly checked for, along with making sure there is time for rest in the shade and adequate hydration. Symptoms of heat-related illness include:

  1. Heat exhaustion – Symptoms include excessive thirst, nausea, dizziness, weakness, excessive sweating, decreased urine output, headache, irritability and high body temperature. Heat exhaustion can be triggered by physical exertion in hot and humid weather and is the result of loss of electrolytes through sweating. Sweating pulls both fluids and electrolytes from the body, and they must be replenished to ensure continued cellular function.Most consider heat exhaustion to be a transition step to heat stroke, so aggressive treatment measures should be undertaken if it manifests. Fortunately, with prompt treatment, recovery is promising and rapid. Get the worker to a cool place, have them shed any extra clothing and cool them off with fanning or wet towels. Make sure to give them fluids, but only if they are awake and not confused. Intravenous fluids are an option if the worker is unresponsive.
  2. Heat stroke – Heat stroke produces most of the same symptoms as heat exhaustion, though disorientation and lack of sweating are also present. Heat stroke emerges when the body’s core temperature rises in excess of 105 degrees Fahrenheit, and at this temperature, cellular damage and, by extension, organ failure, is expected in 30 minutes. When the body is stressed with this much heat, proteins inside the cells denature (or lose their physical properties). As a result, the cells lose their structure and leak their contents into surrounding tissue. This can occur throughout the body, so mass organ failure is expected if treatment is not prompt and extensive.Reducing body temperature is the primary goal when heat stroke is present. In fact, it should be attempted before transporting the worker to a medical facility. Move the worker to a cool place and engage in aggressive mechanical cooling. Ideally, the worker would be placed in an ice bath, taking care to monitor the worker at all times, especially if they are unconscious. If an ice bath isn’t available, apply wet, cold towels to the body and head. Intravenous fluid delivery will likely be essential to rehydrate the worker.

Heat stroke should be avoided at all costs. Even if the worker is rapidly resuscitated, serious, long-term complications can emerge. Mortality rates following heat stroke rise dramatically for recovered patients, suggesting that even after recovery, permanent cellular damage is still present and capable of interfering with the body’s normal functions. Research into heat stroke patients has found that functional impairment and loss of independent function are potential outcomes following recovery.

Fortunately, heat exhaustion and heat stroke can be avoided outright if employers take them seriously. Stay educated on heat-related illness awareness and provide plenty of information and hydration options for workers on the job site.