Follow these guidelines to help determine whether a roof is a good candidate for a roof coating and, if so, which coating is most appropriate.
Recovering a roof on an institutional or commercial facility is a far less intensive process than replacing a roof, and it is a logical starting point when considering roof work. With advances in roof coating materials and a host of new options on the market, building owners and managers might be increasingly inclined to look to a roof recover as a less expensive, less disruptive option than full replacement.
How can owners determine whether the roof is a good candidate to receive a roof coating, and, if it is, which coating is the most appropriate coating for the roof? Identifying and applying criteria for evaluating the existing assembly and selecting a roof rehabilitation approach allows owners and managers to make informed decisions about roofing options that will extend the roof’s service life and improve performance.
Roof assessment strategies
Existing roof systems that are most likely to be candidates for recover are those that have performed well and are approaching the end of the warranty period. Managers should view a roof coating as a means of prolonging the life of an existing roof membrane, not as equivalent to a new roof system.
Before moving forward with a roof recover project, managers should undertake an evaluation of the general field condition of the roof and the existing detailing and condition of roofing terminations. This process will confirm that the roof is a good recover candidate, and it will determine the extent of preparation and repair work required before the application of the new coating or membrane.
The installation of a roof coating will not correct existing roof detailing failures, and managers should not lean on it as a wholesale solution to roof water infiltration issues. A visual inspection can identify trouble spots where the existing detailing at areas like wall flashing, roof penetrations, and roof edges is not performing adequately and requires repair or replacement.
Infrared inspection, electronic field vector mapping, and other nondestructive testing are useful tools and should be considered as part of the design process. Nondestructive testing aids in identifying areas in the existing roof membrane and insulation compromised by water infiltration that might not be observable through visual inspection. Replacing compromised insulation, repairing existing membrane failures, and ensuring that existing roof terminations are watertight are important prerequisites for recovering a roof.
When evaluating an existing roof system …….