Needing a special safety sign? Why not create your own?
You’ve identified asbestos on your site, you’ve got the right warning signs ready, but now you’re facing the critical question: where exactly do these signs need to go? Placing asbestos warning signs in the wrong location is almost as ineffective as not having them at all. Someone could still disturb dangerous materials simply because they didn’t see the warning in time.
The Control of Asbestos Regulations 2012 requires asbestos warning signs to be positioned where they provide effective warning to anyone who might be at risk. But what does “effective warning” actually mean in practice? Let’s break down exactly where asbestos signs should go, how high they should be mounted, and how to ensure they’re visible when it matters most.
Before we get into specific locations, it’s worth understanding why placement matters so much. Asbestos warning signs serve one primary function: to prevent people from unknowingly disturbing asbestos containing materials or entering contaminated areas. This means signs must be positioned at decision points, the moment before someone takes an action that could expose them to asbestos fibres.
A sign placed inside a room containing asbestos is far less useful than one on the door before you enter. A warning on the back of a panel is ineffective compared to one on the access side. The HSE is clear on this: signs must be seen before the risk is encountered, giving people the chance to stop, assess, and follow safe procedures.
This principle applies whether you’re managing a large construction site, maintaining a commercial building, or overseeing refurbishment work in a single property. The goal is always the same: ensure anyone approaching asbestos sees a clear warning before they’re exposed.
Certain locations on every site require asbestos warning signs when asbestos containing materials are present. These aren’t suggestions; they’re the baseline for compliance.
Every main entrance to a site containing asbestos should display appropriate warning signage. This includes vehicle gates, pedestrian access points, and any regular entry routes used by workers, deliveries, or visitors. The sign here serves as a primary alert that asbestos is present somewhere on site, prompting everyone to check site documents and follow established protocols before starting work.
For construction sites, this often means placing signs on perimeter fencing or gates at eye level (typically 1.5 to 2 metres high) where they’re immediately visible when approaching. The wording should indicate that asbestos is present on site and direct people to report to the site office or consult the asbestos register before beginning work.
Any door, hatch, access panel, or barrier providing direct access to areas containing asbestos must carry warning signage. This is perhaps the most critical placement because these signs provide the last line of defence before someone physically encounters asbestos materials.
Examples include doors to plant rooms containing asbestos pipe lagging, hatches accessing roof voids with asbestos insulating board, cupboards housing asbestos containing boilers or equipment, and access panels to service ducts lined with asbestos materials. The sign should be placed on the external face of the door or panel, clearly visible before it’s opened, at a height where it’s naturally within the line of sight when someone reaches for the handle (typically 1.4 to 1.7 metres).
When licensed asbestos removal is underway or areas are cordoned off due to asbestos disturbance, exclusion zone signs must mark the perimeter clearly. These signs typically use more emphatic wording such as “DANGER: ASBESTOS REMOVAL IN PROGRESS Do not enter” and should be placed at regular intervals around the entire exclusion boundary.
On construction sites, this means placing signs every 5 to 10 metres along barrier fencing or tape, ensuring there’s no obvious gap where someone could enter without seeing a warning. The signs should face outward toward potential approach routes, and be visible from at least 3 to 5 metres away in typical site conditions.
Where practical and safe to do so, place warning signs directly on or immediately beside asbestos containing materials. This might include signs affixed to asbestos cement roofing sheets, attached to pipework with asbestos lagging, or mounted on walls adjacent to asbestos insulating board panels.
The challenge here is ensuring the sign placement doesn’t itself disturb the asbestos. Use non invasive fixing methods such as cable ties, magnetic fixings for metal surfaces, or carefully positioned adhesive signs that don’t require drilling or mechanical fixing into asbestos materials. The sign should be positioned where anyone working near or maintaining the area will see it before they touch, drill, cut, or otherwise disturb the material.
Beyond the essential placements, several secondary locations support comprehensive asbestos communication across your site.
Display asbestos location information in site welfare facilities, induction areas, and notice boards where workers gather. Whilst these aren’t warning signs in the traditional sense, site maps showing asbestos locations or general awareness posters reinforce the message and remind workers to check before they dig, drill, or demolish.
These displays work particularly well in canteens or changing facilities where workers have time to read and absorb information during breaks. Include clear instructions on who to contact if suspected asbestos is discovered and what procedures to follow.
In buildings with extensive asbestos containing materials along service routes (common in older hospitals, schools, and office blocks), placing signs at corridor intersections or along service routes provides regular reminders as workers move through the building. This is especially important in buildings where maintenance staff routinely access ceiling voids, under floor spaces, or service ducts.
The signs don’t need to be large or prominent here, but they should be positioned consistently (for example, at every major junction or every 20 metres along a corridor) so workers develop an expectation of seeing them in these locations.
If work involves removing asbestos materials, designated storage areas for bagged asbestos waste and skips licensed for asbestos disposal must carry appropriate warning signage. These signs alert everyone on site that the area contains contaminated materials and should not be accessed without authorisation.
Place these signs on all sides of the designated area and on the skip itself, ensuring they remain visible even as bags accumulate or site layouts change during the project.
The best placed sign is useless if nobody can see it. Height, size, and visibility all matter when positioning asbestos warning signs.
Mounting height: The standard recommendation is to mount signs between 1.4 and 2 metres above ground level, placing them in the natural line of sight for people of average height. This range works for most applications, though you might adjust slightly for specific situations (lower for signs on low access hatches, higher for signs on tall doors or gates).
Size and legibility: Signs must be large enough to read from the distance at which someone would typically approach them. For indoor applications, A4 signs are usually adequate for viewing distances up to 3 metres. For outdoor use, site perimeters, or longer viewing distances, A3 or larger formats ensure legibility. Letter height should follow the general rule of at least 10mm per metre of viewing distance.
Contrast and lighting: Choose sign colours with high contrast (yellow background with black text, or blue background with white text) to ensure visibility in varying light conditions. In poorly lit areas such as basements, service voids, or night time construction sites, consider photoluminescent signs that remain visible even in darkness, or ensure supplementary lighting illuminates warning signs adequately.
The environment affects both where you place signs and what materials you choose.
Internal signs can be smaller and lighter, as they’re protected from weather and typically viewed from shorter distances. Focus placement on actual access points such as doors, hatches, and panels rather than general wall space. In cluttered environments (plant rooms, storage areas), ensure signs aren’t obscured by equipment, stored materials, or other signage. Regular checks help confirm signs remain visible as site conditions change.
Self adhesive vinyl signs work well for smooth internal surfaces and are easy to position precisely. For rougher surfaces or temporary installations, rigid signs with appropriate fixings provide better durability.
External signs face tougher conditions and need positioning that accounts for weather, viewing distance, and site traffic patterns. Signs on perimeter fencing should be positioned on the side facing approaching workers or public, at regular intervals, and secured with fixings that resist wind, rain, and accidental damage.
Choose weather resistant materials (high impact polystyrene, aluminium composite, or marine grade vinyl) that maintain legibility despite exposure to sun, rain, and site dirt. Regular replacement schedules ensure faded or damaged outdoor signs don’t compromise safety communication.
Some situations require more thoughtful sign placement strategies.
In buildings with asbestos on multiple floors, use floor specific signage that clearly indicates which level contains asbestos. Stairwell signs warning of asbestos on specific floors, signs at lift doors on affected levels, and floor plans in circulation areas showing asbestos locations all contribute to clear communication.
Each floor containing asbestos should have signs at all access points (stairs, lifts, fire doors) to ensure anyone arriving on that level via any route receives warning.
When sites adjoin public footpaths, residential areas, or active commercial premises, your signage strategy must protect members of the public who might inadvertently approach asbestos work areas. Signs facing public areas should be clear but not alarmist, explaining that authorised work is underway and access is restricted.
Position these signs where members of the public would naturally see them if approaching the boundary, and ensure your exclusion zone extends far enough that casual proximity doesn’t create exposure risk.
Refurbishment and demolition sites have dynamic layouts where walls come down, access routes change, and asbestos locations become exposed during work progression. Your signage strategy needs regular review and updating.
Designate someone (typically the site supervisor or health and safety officer) to check sign placement daily, particularly after any changes to site layout, and reposition or add signs as needed. Temporary signs using cable ties or magnetic mounts make quick repositioning practical as conditions evolve.
Asbestos warning signs must communicate effectively to everyone on site, regardless of language, literacy, or visual ability.
Pictograms and symbols: Always include the standard asbestos hazard symbol (white ‘a’ on black background within yellow warning triangle) alongside text. This provides instant recognition for workers who may not read English fluently or at all. The symbol communicates danger universally.
Multilingual text: On sites with diverse workforces, consider bilingual or multilingual signs showing key warnings in languages commonly spoken by your workers. Polish, Romanian, Portuguese, and Bulgarian are frequently relevant on UK construction sites. Alternatively, ensure site inductions cover asbestos locations in workers’ first languages and that pictogram based signs provide backup communication.
Clear typography: Use large, clear sans serif fonts (Arial, Helvetica) with high contrast between text and background. Avoid decorative fonts, all capital text blocks (which are harder to read), and colour combinations that people with colour vision deficiencies struggle to distinguish.
A sign that falls off or gets damaged is worse than useless; it suggests the hazard has been resolved when it hasn’t. Choose fixing methods appropriate to the surface and expected duration.
For permanent installations on smooth surfaces, high quality self adhesive vinyl provides reliable fixing. For rough surfaces, consider drilling and plugging (taking care not to disturb asbestos materials), cable ties through fence mesh, or magnetic mounts for steel surfaces.
Temporary exclusion zones often use signs cable tied to barrier tape or fencing. Check these daily to ensure they haven’t been damaged, removed, or obscured by wind blown debris.
Sign placement isn’t a one time task. Regular inspection ensures signs remain visible and effective throughout your project or building’s operational life.
Weekly checks should confirm all required signs are in place, undamaged, legible, and unobscured. Replace any damaged signs immediately; a torn or faded sign fails to provide adequate warning.
After significant events (storms, site incidents, layout changes, completion of work phases), conduct a thorough review of all asbestos signage and update as necessary. Document any changes in your asbestos management plan or site safety file.
When work completes and asbestos is safely removed or encapsulated, remove warning signs and update site documentation accordingly. Leaving obsolete asbestos warnings in place after materials are removed causes confusion and undermines credibility of safety signage generally.
Before declaring your asbestos signage complete, run through this checklist:
Whilst this guidance covers the fundamentals, complex sites or high risk situations benefit from professional advice. Licensed asbestos removal contractors provide site specific signage plans as part of their work, and asbestos consultants can review your signage strategy during management surveys or re inspection visits.
Lasting Impressions supplies compliant asbestos warning signs suitable for all the placements discussed here, with materials and sizes chosen to match different site conditions and requirements. Our construction site signs range includes everything needed to maintain clear safety communication throughout your project.
For guidance on selecting appropriate signs or discussing placement strategies for your specific site, get in touch and we’ll help ensure your asbestos warning signs are positioned for maximum effectiveness.
You can learn more about our experience supplying safety signage to UK construction sites since 2002, or read customer testimonials from others who’ve trusted us for their site safety requirements.
Getting asbestos warning sign placement right protects lives, demonstrates compliance, and creates a safety conscious culture on site. The investment in proper placement is minimal compared to the consequences of someone unknowingly disturbing asbestos because they didn’t see a warning in time.
Think strategically about approach routes, decision points, and visibility. Place signs where they’ll be seen before action is taken, maintain them throughout the project, and remove them when work is complete. These simple principles, consistently applied, ensure your asbestos warning signs fulfil their essential role in keeping people safe.
