⏱️ Estimated reading time: 11 min
Key Takeaways
Wearing earplugs and ear defenders together, with the plug in the canal and the defender sealed over it, for work too loud for one protector.
From about 100 dB(A) of daily exposure, where HSE’s selection table asks for SNR 30 or more, and almost always above 110 dB(A) or where peaks are extreme.
Roughly 4–6 dB over the better protector alone. HSE puts the gain at no more than about 6 dB over the higher SNR, so the two ratings are never added together.
Yes, if the plug sits flush and the defender cushion still seals against the skin. Long stems or cords can lift the cushion.
No. One well-fitted protector usually brings 90 dB(A) down to around 70 dB(A) at the ear, the bottom of HSE’s target. A second layer pushes it below 70, which HSE counts as over-protection.
The Control of Noise at Work Regulations 2005 set no specific level for doubling. You double up when one protector cannot keep the ear below 87 dB(A) and a 140 dB(C) peak.
Double hearing protection means wearing earplugs under ear defenders at the same time. You need it from about 100 dB(A) of daily noise exposure, almost always above 110 dB(A), or where peaks are extreme, as in drop forging, on an airport ramp near running engines or at a shooting range. Together, the two layers add roughly 4–6 dB over the better protector alone.
On workshop and range forums you often see the sum 30 + 30 = 60 dB for a plug under a muff. It is wrong by a wide margin. HSE estimates that around 15,000 workers in Great Britain have hearing problems caused or made worse by work (Labour Force Survey, 2022/23 to 2024/25), so the loudest jobs are worth getting right.
At Bollsen, we are a hearing protection brand trusted by 1,000,000+ people, making reusable silicone earplugs for work, sleep, music and travel. Our hub on earplugs for work covers construction sites, factories and warehouses, with noise levels and UK rules job by job.
What is double hearing protection?
Double hearing protection is the combination of an earplug tested to EN 352-2, worn in the ear canal, and an ear defender (earmuff) tested to EN 352-1, sealed over the outer ear, so that noise has to pass two barriers before it reaches the eardrum.
Most UK jobs that need protection sit between 85 and 95 dB(A), where one well-fitted protector is enough.
When do you need double hearing protection?
You need double hearing protection when your daily noise exposure reaches about 100 dB(A), the point where HSE’s protector selection table moves to SNR 30 or more, and almost certainly once it passes 110 dB(A) or peaks exceed 150 dB(C), especially with strong noise below about 500 Hz.
The 110 dB(A) and 150 dB(C) figures come from HSE’s L108 Controlling noise at work, which says wearing both is likely to be needed at those levels. The 100 dB(A) point is the last row of the selection bands in HSE’s hearing protection guidance, where 100–105 dB(A) asks for SNR 30 or more.
Working out how much hearing protection you need starts with your noise level and its band. Our guide to how much hearing protection do I need walks through the full SNR band table and the 4 dB real-world correction, including the 100–105 dB(A) row where doubling starts.
How much extra protection does doubling add?
Wearing earplugs and ear defenders together adds roughly 4–6 dB over the better protector alone, and HSE caps the gain at about 6 dB above the higher SNR, so the two ratings are never added together.
Sound also reaches the inner ear through the bones of the skull, and no protector blocks that path, which caps what any combination can achieve. A defender cup can also shift a plug and weaken its seal.
So a plug rated 30 under a muff rated 30 gives around 36 at best, not 60. A UK woodworking forum regular named the weak link: a half-seated plug works loose, and the pair then does little more than the muff alone.
Which jobs need earplugs and ear defenders together?
The jobs that call for ear muffs and ear plugs together are those with sustained noise above about 100 dB(A), such as power tools like angle grinders, concrete breakers and chainsaws, plus impulse noise settings like drop forging and shooting ranges, while ordinary 90 dB(A) workshop noise needs only one protector.
| Setting | Typical level | Plugs alone | Defenders alone | Both | Why |
|---|---|---|---|---|---|
| Factory floor or workshop | About 90 dB(A) | Usually enough | Usually enough | No | Two layers over-protect, below 70 dB(A) |
| Angle grinder or circular saw | About 100–110 dB(A) | Only if rated SNR 30+ | Short tasks only | Yes, for long use | HSE’s 100–105 row asks for SNR 30+ |
| Concrete breaker | About 100–115 dB(A) | Not enough | Borderline | Yes | Long spells, heavy low-frequency noise |
| Chainsaw | About 105–115 dB(A) | Not enough | Borderline above 110 | Yes, above 110 dB(A) | HSE: both likely needed above 110 dB(A) |
| Foundry fettling or drop forge | 100+ dB(A) with heavy impacts | Not enough | Not enough | Yes | Peaks judged against 135/137/140 dB(C) |
| Airport ramp near running engines | Around 130–140 dB, short spells | No | Standard kit | Often, plugs underneath | Highest levels here, at close range |
| Shooting range | Impulse, peaks 140 dB+ | No | Not enough indoors | Yes, standard practice | Ratings describe continuous noise, not peaks |
For more machines, our chart of how loud are power tools (decibel chart) shows which tools sit above the 100 dB(A) line.
Construction workers meet this most often. Our guide to earplugs for construction workers goes through those site jobs one by one, including when plugs belong under ear defenders.
For bench work, our guide to earplugs for power tools and woodworking covers grinders and planers. Chainsaw users will find their side in our guide to hearing protection for mowing and landscaping.
Why should you not double up at 90 dB(A)?
At 90 dB(A), doubling is the wrong answer, because one well-fitted protector already brings the ear close to 70 dB(A), the bottom of HSE’s 70–80 dB(A) target, and a second layer pushes it into over-protection.
Take our WorkPRO earplugs, rated SNR 24. HSE’s estimate is the noise level minus the SNR plus 4 dB for real-world fit, so 90 − 24 + 4 gives 70 dB(A) at the ear with the plugs alone. Put ear defenders on top and you drop below 70.
HSE warns against that: people who feel cut off lift a cup or pull a plug to talk. A protector out of the ear protects nothing.
What happens on an airport ramp?
On an airport ramp, close to a running jet engine, levels can reach around 130–140 dB, which is why ramp crews wear ear defenders as standard and often add earplugs underneath for the minutes spent beside running engines.
Short spells beside a running engine drive the daily dose, so the risk assessment should cover them. For crews who double up, the plug has to sit flush so the defender cushion still seals. WorkPRO is low-profile and goes under ear defenders.
What about shooting ranges, forges and other impulse noise?
Impulse noise, such as gunfire or the hammer blows of a drop forge, is judged by its peak sound pressure against the 135, 137 and 140 dB(C) values in the 2005 Regulations, and HSE’s SNR band table does not describe it.
Shooters double up by habit. In one Reddit thread about indoor ranges, a regular said they always wear earmuffs over foam earplugs, which is standard range practice where peaks reach 140 dB and above. WorkPRO is low-profile and goes under ear defenders.
Forges combine sustained noise above 100 dB(A) with heavy impacts. In a NIOSH health hazard evaluation at a forging company, investigators recommended earplugs and earmuffs together wherever exposures were above 100 dBA.
Which earplugs and ear defenders work best together?
The most useful pairing, according to HSE’s L108 guidance, is a high-performance earplug under a moderate-performance ear defender, because the well-fitted plug does most of the work. HSE also advises getting test data for the exact combination, including any helmet.
Put the plugs in first, check the seal, then fit the defenders so the cushions sit flat on skin, with no stems, hair or glasses arms underneath. If you also wear a hard hat or respirator, our guide to earplugs with a hard hat, glasses and respirator covers the order.
Replace defender cushions once they crack or harden, because a worn cushion leaks. Our comparison of earplugs vs ear defenders at work sets out where each wins on comfort, heat and fit.
Our WorkPRO earplugs are low-profile, 2-lamella hypoallergenic silicone plugs tested to EN 352-2 by an independent German lab, so they sit inside the ear without pushing against a defender cushion. They are reusable up to 100 times.
For steady noise in HSE’s 90–95 dB(A) band, our WorkPRO earplugs (SNR 24 dB, £29.95) work on their own, and for louder work WorkPRO is low-profile and goes under ear defenders.
Still comparing plugs for jobs where one plug is not enough on its own? Our roundup of the best earplugs for work compares options by rating, fit and comfort.
Does UK law require double hearing protection?
No UK law sets a specific level for double hearing protection. The Control of Noise at Work Regulations 2005 require protection to be offered from 80 dB(A) or a 135 dB(C) peak, worn from 85 dB(A) or 137 dB(C), and exposure at the ear kept below 87 dB(A) and 140 dB(C), so you double up whenever one protector cannot meet those limits.
Your employer’s noise risk assessment should show which tasks need it, after noise has been cut at source. US hearing protection standards use different numbers. If you work to US rules, the term you will see is dual hearing protection, and our guide to OSHA hearing protection standards explains how US limits and protector ratings work.
So should you double up?
Double up from about 100 dB(A), near jet engines, at a forge or on a range, and expect roughly 4–6 dB over your better protector. At 90 dB(A), one protector is enough and two is too many. For the loudest jobs, WorkPRO is low-profile and goes under ear defenders, and the protection that counts is the one still in place when the noise starts.
His connection to hearing protection stems from personal experience with sound sensitivity during live events and work in noisy environments, an issue that made him more aware of the long-term risks of unmanaged noise exposure. Today, as both a communicator and a user of BOLLSEN products, he is passionate about raising awareness around the importance of proactive hearing care.
At BOLLSEN, he develops data-driven marketing campaigns, writes SEO-focused articles, and manages communication channels that connect customers with practical knowledge about hearing protection. His work ensures that BOLLSEN’s message—prioritizing health, performance, and sustainability reaches a global audience in an engaging and trustworthy way.
Passionate about writing since childhood, Timotej combines creativity with a strong analytical approach, continuously testing new ideas in digital marketing, performance advertising, and social media. He believes in learning through innovation and collaboration, balancing leadership with openness to new perspectives.
Beyond his professional role, Timotej is committed to a healthy lifestyle and finds inspiration in fitness, sports, and quality time with friends. His personal passion for well-being aligns with BOLLSEN’s core values, making his work not only a career but also a cause he deeply believes in.