Every other trade that climbs onto a commercial roof can void the warranty with one careless screw.
A commercial roof is rarely used by one trade. A telecom carrier adds an antenna mount. A sign company bolts a pylon to the parapet. An HVAC contractor swaps a rooftop unit and runs new refrigerant lines. Each visit looks small, and each one puts people with no roofing training on a waterproof membrane that costs the owner a great deal of money.
The damage rarely shows up on the day. A dropped tool punctures the surface and goes unnoticed. A mounting bracket gets a bead of caulk instead of a proper flashing. Six months later, a ceiling stain appears, and nobody can say who was on the roof or what they did. The warranty claim is denied because the roof was altered without the manufacturer’s approval. A simple sign-off process prevents most of this.
A manufacturer’s warranty covers the roof as installed by an approved contractor, in the condition it was handed over. Most warranties also set out conditions. Penetrations, new equipment and repairs must be done in a way the manufacturer accepts, usually by an authorized applicator. Work done by someone else can void part or all of the coverage.
Few building owners read those terms until they need them. A signage contractor has no reason to know them at all. Their job is to get the sign up. If the lease says the tenant may install a rooftop sign, the tenant may hire anyone, and the building owner finds out when the leak appears.
This is why the process has to start with the owner or property manager. Nobody else in the chain has both the authority and the incentive to protect the roof.
The simplest control is a written rule that no contractor goes on the roof without notifying the property manager first. That sounds obvious, yet many buildings leave the roof hatch open to anyone or the key in a tenant’s office. A lockbox with a sign-out log works well. The log records who went up, when, why, and who from the roofing contractor approved the work.
For any job that touches the membrane, such as a new penetration, a bracket, a curb or a cable run, the request should be reviewed by the roofing contractor of record before approval. This takes a day or two and prevents weeks of dispute. It also gives the roofer a chance to propose a better route for conduit or a different mounting location that avoids a penetration altogether.
Telecom work deserves extra attention. Carriers often have access rights written into a lease, and their crews arrive on a schedule that is hard to move. Build the sign-off requirement into the lease or the access agreement so it is not a surprise.
A penetration is any pipe, post, bracket or cable that passes through or attaches to the roof. Each one is a place water can enter. The detail around it, usually a pitch pocket, a boot, a curb or a prefabricated flashing, must be built to suit the membrane type and tied into it properly.
The roofer should be on site when the hole is made or the base is fastened, and the roofer should do the flashing. A tradesperson who works with the membrane every day knows how to heat-weld a patch, adhere a flashing and test the seam. A sign installer with a tube of sealant does not. Sealant alone is a temporary measure. It dries, cracks in cold, and fails in the first freeze-thaw cycle.
Where the membrane is a single-ply system, welded seams and manufacturer-approved accessories matter. Where it is modified bitumen, torch or cold-applied flashings have their own requirements. Either way, the work should be done by a crew authorized by the manufacturer, so the warranty remains intact.
Foot traffic wears down a membrane. Every trip from the hatch to a rooftop unit grinds grit into the surface. Walkway pads, which are thick sheets of membrane material welded or adhered along common routes, take the wear instead.
Install them on the path from the access point to each piece of equipment, and mark the route so crews follow it. Add extra protection where a contractor will be moving heavy gear, such as a plywood or rubber mat under a dolly or a crane outrigger. Cold weather makes membranes stiffer and more likely to crack under impact, so winter work needs more care.
Tools and materials are another hazard. Screws, offcuts of metal and cigarette butts all end up on a roof. A screw under a boot heel can puncture a membrane, and the hole may not leak for months. Require that crews sweep up before leaving and photograph the area when they do.
Photos settle arguments. Before any third-party work begins, the property manager or roofer should photograph the area around the planned work, including the membrane surface, the nearest flashings and the drains. After the work, the same viewpoints are repeated.
Date-stamped images give you a baseline if damage appears later. They also make a contractor think twice about leaving a mess. Store them with the sign-out log and the work order so that one folder holds the full story of each visit.
For larger projects, a short walk with the roofer afterward is worth the time. The roofer can check seams, look for punctures and confirm that every new penetration has the right detail.
The process works best when it is written down and included in the contracts that give others access to the roof. A few clauses make the difference.
These terms put the cost where it belongs and give the building owner something to point to if a dispute arises.
Antenna mounts and sign pylons are the two requests that cause the most trouble, because both are heavy, both are tall and both carry wind load. A ballasted frame that sits on the membrane adds weight the roof may not have been designed for. A frame fastened through the roof needs the structure below to take the load, and a structural engineer should confirm that before anyone drills.
Cable runs are the quiet offender. Carriers and sign companies often drag cable across the membrane and over the parapet, where it rubs a hole through the surface in the first windy season. Ask for cable trays on supports that lift the run off the roof, with the supports sitting on protective pads rather than bare membrane.
Plan for removal as well. When a tenant leaves or a carrier upgrades equipment, the old mounts come off and the holes they leave must be closed properly. Add a removal clause to the access agreement that makes the departing party pay for the repair, and confirm the repair with a roofer before the final sign-off. Abandoned bolts and bare penetrations are the leaks that nobody remembers causing.
Winter adds one more consideration. In a Calgary cold snap, membranes lose flexibility, adhesives cure poorly and welds are harder to make. If a new mount cannot wait for spring, ask the roofer how the detail will be built at low temperatures, and whether a temporary seal followed by a permanent flashing in warmer weather is the safer plan.
A roof that hosts antennas, signs and mechanical equipment can still last its full service life. It needs a rule that every visit is logged, every penetration is flashed by a qualified crew, and every change is photographed.
When a third party does leave damage behind, fast and correct repairs matter. Sealant and tape are stopgaps. A proper fix involves membrane and flashing repairs in Calgary done to the manufacturer’s detail, so the warranty stays valid and the leak does not return. Set up the process now, before the next contractor asks for the hatch key.
About the author: this article was contributed by Superior Roofing in Calgary, where Red Seal journeymen and HAAG-certified inspectors work alongside facility managers to protect commercial membranes, backed by $10 million in liability insurance and authorized applicator status with SOPREMA, Carlisle and Duro-Last.
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