With 124 rooflights to remove, there were restricted areas, with hand rail, designated walkways and signage which had to be moved around the roof area after removal and replacement of each rooflight. The scissor lift saw some serious action as it was under every individual rooflight whilst work was being carried out above. All work above the opening and scissor lift underneath were attached to a spider block and harness to ensure worker safety. At no point was any opening left unattended during the removal and/or replacement before moving onto the next one.
We had to remove each rooflight one by one, install a new upstand using Sika Trocal laminated metal, mechanically fixed to the existing substrate. Finally, the replacement roof light was fixed to the upstand. When the area around the roof light was recovered, the Trocal Type S membrane was solvent welded to the upstand to maintain the integrity of the weatherproofing system.
The guys working above, installing new upstands for fixing the new roof lights, were attached to a spikder block, using an inertia block and harness whilst work was being carried out at all times. Only personnel donning a safety harness and inertia wheel were allowed into the restricted area around each skylight. Thbere were no exceptions.
The majority of the roof lights were replaced within the first couple of weeks of the project with work starting the day after arrival. It was arduous and repetitive work in the beginning. When the roof lights in each section were finished, we were in a position to overlay the roof with the insulation and recover with Trocal Type S in light grey, solvent welded to the Trocal metal washers used to fix the insulation to the steel deck substrate.