Inadequately planned roof access is not only a liability, it causes damage to the building envelope as well, due to many years of unmanaged foot traffic and ad hoc routes. Every commercial flat roof that is maintained without a specified pathway system is likely to suffer punctures in the membrane, impaired drainage, and workers making split-second decisions close to hazardous edges. It’s not too dramatic to say that putting in the right pathway solution before maintenance work starts is one of the only interventions that will safeguard both lives and building fabric simultaneously.
Start With Hazard Mapping, Not Hardware
Before you get to that level of detail, yes, of course, somebody needs to walk the roof and take note of every hazard. Roof lights that might be fragile. Proximity to roof edges. Drainage routes the route must take. Areas around roof plant or other equipment. Any trip hazard, including differing underfoot surfaces wet bitumen or gravel, metal flashing, or raised curbs.
But then, the whole point of that survey is that you apply the hierarchy of control in a set order. Collective protection first: for instance, a designated route or walkway, permanent guardrails, skylight screens. Personal fall-arrest gear, i.e. harness/anchor points, is your backstop solution, not your front-line protection. When you design a maintenance pathway properly, your workers shouldn’t need to rely on personal protective equipment to keep themselves safe while going about their work, the actual route should do that for them. Roofs account for a significant proportion of roof work fatalities in maintenance activities, with falls to a lower level making up over 13% of all occupational fatalities (U.S. Bureau of Labor Statistics.).
Design your route to keep workers at least two meters from unprotected edges wherever possible. Where the locations of equipment or other constraints mean that the route has to run closer to the roof edge, use physical barriers as well as painted lines.
Designing the Transition Zone Properly
The single most dangerous moment in any maintenance visit is when a worker steps out of a roof hatch. The transition from ladder to roof, often while laden with tools, is where most slips and falls occur.
It takes more than simply a cover to make an access hatch safe. Adding grab bars into the design on both sides of the opening gives workers something secure to hold when crossing that dangerous zone. Self-closing safety gates ensure that an open hatch doesn’t create an unguarded floor opening just because a worker had to move a few feet away. Hold-open arms keep that heavy lid from crashing onto someone’s fingers or a ladder.
Specifying Surespan access products with a thermal break built into the frame also solves a common practical building performance problem, metal frames conduct cold, causing condensation on the interior side and leading to corrosion, ice formation, and slippery surfaces right at the transition point. A thermally broken frame keeps things structurally sound and safer year-round. And it’s one of the details that tend to get missed when only the size of the opening is specced.
Protecting the Membrane is a Budget Decision
Roof membrane damage happens slowly and out of sight, but repairs come fast and in full view. A single puncture from a boot heel or a dropped tool can allow water to travel unimpeded beneath the surface for months before that moisture seeps through insulation and shows as a stain on the ceiling below. By that point, the cost of repair has multiplied several times over to a full tear-off and replacement of all wet insulation and membrane.
Dedicated walkway tiles or raised grating along established maintenance routes solve this directly. Slip resistance matters here too, smooth membrane surfaces become hazardous in wet or icy conditions, and any walkway tile or grating specified for the route needs to maintain adequate friction across seasons. Demarcation lines help communicate the approved route, but they don’t protect the membrane from someone stepping off the path. Physical walkway systems do both.
High-traffic areas near plant equipment, drainage inspection points, and antenna masts are the most vulnerable. These are the places that see the most boots per year, so they need the most durable surface treatment.
Inspection Schedules Are Part of the Design
A well-built pathway will become unsafe over time if it’s not maintained properly. Tiles will move, fixings will loosen, corrosion will degrade grab bars, and mechanisms on safety gates or railings will wear out. None of these failures provide warning of their intention.
As a building owner or manager, you must establish an inspection and maintenance schedule for all your pathway components. We recommend that an annual or biannual schedule be incorporated into the building’s regular facilities management routine. Access covers and hatches should be checked for seal integrity, hinge condition, and latch function. Guardrails should be load checked. Demarcation lines must be repainted when they fade, and skylight screens inspected for deflection or fixing failures.
A record of inspection is also important for liability issues. Should a worker suffer an injury on the roof, the condition of the pathway at that time will be scrutinized. Documented, dated inspection records provide evidence that the building owner met their duty of care.
Getting the Design Right the First Time
Regular maintenance of commercial flat roofs is inevitable. Equipment needs to be checked, and repairs need to be made. The only question is, will workers access the roof in a planned manner that protects the roof and keeps them safe or in an ad hoc, unplanned manner every time they climb out of the hatch?
Designing a route, with access points, walkways, and guardrails, costs far less than one insurance deductible or a premature roof replacement. Design it once and the roof will take care of itself.
