Cement Burns and Dermatitis: The Hazard Masons and Concrete Crews Feel Too Late (2026)

Wet cement burns skin without hurting at the time. It reaches a pH of 12 or higher, against skin that sits between 4 and 7, and the reaction produces little or no heat. A worker can have wet mortar against their skin for hours feeling nothing worse than damp, while the damage progresses underneath.

That delay is the whole problem. By the time it hurts, the burn is established, and second or third degree burns can follow relatively short exposures. Portland cement is estimated to account for a quarter or more of all work-related skin problems worldwide.

Why it does not hurt until it is too late

The chemistry is straightforward. Cement contains calcium oxide. Add water and it becomes calcium hydroxide, which drives the pH sharply upward. High alkalinity destroys tissue in the same way a strong acid does, and cement burns are as severe as acid burns.

What makes it different from an acid splash is the absence of a signal. The worker is often unaware of the process because it produces little or no heat, and there is no immediate pain to trigger a reaction. The reaction continues for as long as the material stays in contact.

Two additional properties make it worse. Industry guidance on cement burns notes that wet concrete is hygroscopic, so it actively draws moisture out of skin, and abrasive, physically damaging the skin surface and making it a less effective barrier against everything else.

Cement burns look like other burns once they appear: blisters, dead or hardened skin, and discolouration that can run to black or green. Research-based guidance on skin protection in construction notes that second or third degree burns may occur after relatively short exposures to fresh mortar, concrete and grout. Because the onset is slow, they are routinely misread as ordinary irritation until the damage is significant.

Clothing is not protection here

This is the mechanism that catches experienced tradespeople, and it is worth being blunt about.

Liquid from wet cement penetrates clothing. A worker kneeling in mortar, or wearing trousers that soaked through an hour ago, has cement held against skin under pressure for the rest of the shift. Damp or wet clothing makes the exposure worse rather than better, because it holds the material in contact instead of letting it fall away.

The classic injuries follow that pattern. Knees from kneeling in fresh concrete. Ankles and lower legs from slurry running into boots. Wrists and forearms from material entering glove cuffs. Every one of those is a place where fabric traps the material against skin.

Boots need to keep slurry out rather than simply be waterproof. A tall PVC or rubber boot such as the Acton Function 15-inch waterproof PVC boot covers the wading depth that matters, and the STC Keep 8-inch chemical resistant boot or shorter STC Trump 6-inch version handle general wet work. Trousers worn outside the boot rather than tucked in keep material from running down the shaft.

Gloves, and why cuff length decides the outcome

Ordinary work gloves are the wrong tool. Leather absorbs the material and holds it against the hand, which turns a glove into a poultice.

Treat wet cement as the chemical it is and select accordingly. Cuff length matters as much as material, because material entering at the wrist is one of the most common exposures and the forearm has no other protection. The Forcefield 18-inch chemical resistant gloves exist for exactly that, and PVC chemical resistant gloves suit shorter handling tasks. For crews going through gloves quickly, bulk PVC gloves by the case make replacement routine rather than a decision.

Change gloves when they are contaminated inside rather than when they wear out. A glove with cement slurry inside is worse than no glove, because it holds the material against skin and the worker cannot see it happening.

The wider discipline of matching glove material to a specific substance is covered in our guide to choosing chemical resistant gloves, including why breakthrough time matters and why a glove chart cannot answer for a mixture.

From irritation to a career-ending allergy

The acute burn is the visible injury. The slower problem is dermatitis, and it follows a progression worth understanding before it starts.

Irritant contact dermatitis comes from repeated contact with alkaline materials. It appears within hours in its acute form, and the chronic form develops gradually with indistinct borders and can persist for years after exposure ends. It starts as dryness and itchiness, then redness, cracking and pain.

Allergic contact dermatitis is the more serious outcome. It occurs in response to small exposures once a worker has become sensitised, and in cement it is linked to hexavalent chromium, which forms during manufacture and is released when cement is mixed with water. Chromate sensitivity also makes cement burns more severe.

The consequence is what makes this worth taking seriously early. Sensitisation is difficult to reverse, and a worker who develops an allergy to cement can be unable to continue in the trade at all. It is difficult, if not impossible, to predict who will develop skin problems based on experience or medical tests, so seniority is not protection.

What to do when contact happens

Speed matters more than technique, because the reaction continues while you decide.

Remove contaminated clothing, taking care not to spread material onto unexposed skin. Wash the area thoroughly with plenty of clean water. Continue flushing rather than a quick rinse, since the aim is to remove and dilute the material completely. Seek medical attention promptly for anything beyond superficial contact, and immediately where a large area is involved or where the material reached the eyes.

One caution about advice circulating online. Some sources suggest applying vinegar to neutralize the alkalinity. Flushing thoroughly with clean water and getting medical attention is the safer course, and anyone with a suspected cement burn should be assessed rather than treated on a job site.

Do not wait for pain as the trigger to act. The absence of pain is a feature of this injury, not evidence that nothing happened. Rinsing after every contact, throughout the shift, is a habit worth building into how the crew works.

Skin left dry, cracked and irritated is also a barrier that has already failed, which makes further exposure worse. Washing with a pH-neutral cleanser at the end of a shift, rather than aggressive site soap, matters more than most crews assume.

Silica: the other masonry hazard

Cutting block, brick and stone is a separate exposure with a separate control, and it needs to be addressed alongside the skin question rather than instead of it.

Respirable crystalline silica is released when masonry materials are cut, ground or drilled, and cement itself contains it. Wet cutting and vacuum-assisted tools reduce the dust at source, which is where the control belongs.

Where respiratory protection is required, dust calls for a particulate filter rather than a cartridge, and a disposable is generally not the right answer for sustained cutting. Our guide to respirator fit testing under CSA Z94.4 covers why fit testing is required, and cutting is loud enough to warrant the protection covered in our hearing protection guide.

Eye protection matters in both directions here: fragments while cutting, and splashes while mixing and pouring. Wet cement in the eye is a medical emergency. Our safety glasses guide covers selection, and the Sellstrom anti-fog clear lens safety glasses suit general site work.

Knees, and the exposure that combines both

Kneeling in fresh concrete is the single worst combination available: sustained pressure holding an alkaline material against skin, through fabric that soaks it up.

It is also mechanically damaging in its own right. Occupational kneeling is associated with a two- to three-fold increased risk of knee osteoarthritis, and the damage accumulates slowly enough to be mistaken for ordinary soreness. Our guide to knee protection for kneeling work covers what the research shows.

Hard-shell pads keep the knee off the material as well as off the aggregate, which is the part that matters here. The Forcefield hard-shell and soft-shell knee pads cover both configurations, and the KneePro Ultra Flex III hinged pads suit work with constant transitions.

Coveralls give a layer that can be changed when it soaks through, which loose site clothing does not. See our comparison of coveralls and bib overalls, and the NomadPro poly-cotton work coveralls as an option. Whatever the layer, change it when it is wet rather than at the end of the day.

For the wider kit see our guides to work boots for concrete workers, slip resistance at work, the complete guide to CSA work boots in Canada, PPE requirements for Canadian construction sites, the complete PPE checklist and our guide to CSA certified versus CSA compliant.

Frequently Asked Questions

Why do cement burns not hurt at first?

Because the reaction produces little or no heat. Wet cement reaches a pH of 12 or higher against skin at 4 to 7, and the alkaline damage progresses without an immediate pain signal. A worker can have wet cement on skin for hours feeling only dampness while tissue damage continues underneath.

Can wet cement soak through clothing?

Yes. Liquid from wet cement penetrates clothing, and damp or wet clothing makes exposure worse by holding material against skin. Kneeling in fresh concrete in soaked trousers is a common mechanism for serious burns. Change wet layers rather than working on in them.

What should I do if wet cement gets on my skin?

Remove contaminated clothing carefully without spreading material to clean skin, then wash thoroughly with plenty of clean water and keep flushing rather than rinsing briefly. Seek medical attention promptly, and immediately for large areas or any eye contact. Do not wait for pain before acting.

Should I neutralize a cement burn with vinegar?

Some online guidance suggests it. Flushing thoroughly with clean water and seeking medical attention is the safer course, and a suspected cement burn should be assessed by a professional rather than treated on site.

What is the difference between cement dermatitis and a cement burn?

A burn is acute chemical tissue damage from contact with wet cement, producing blisters, hardened skin and discolouration. Dermatitis is inflammation from repeated exposure, starting as dryness and itchiness and progressing to redness, cracking and pain. Repeated irritant dermatitis can lead to allergic sensitisation.

Can cement allergy end a construction career?

It can. Allergic contact dermatitis develops after sensitisation and is triggered by small exposures thereafter, and in cement it is linked to hexavalent chromium. It is difficult to reverse, and it is not possible to predict who will develop it, so prevention matters more than experience.

This guide is general workplace safety information, not medical advice. Suspected cement burns, eye contact or persistent skin problems require prompt medical assessment. Consult the safety data sheet for the products you handle, and confirm obligations with the occupational health and safety authority in your province or territory.