Reflective roof coatings are an economical, long-lasting alternative to re-roofing in many circumstances:
A roof coating is not the right solution in all cases, particularly with failed or failing roof systems. A roof coating is not a substitute for roof replacement when conditions such as widespread wet insulation or loss of roof-system adhesion exist. Coatings might restore the watertight nature for a short time, but factors such as the freezing and thawing of wet insulation, membrane splitting under the coating, wind-uplift damage at unadhered areas, and hail damage of weakened areas still can occur. In these cases, it would be wiser to invest in a completed roof system replacement.
You can use coatings to sustain roofs that have ponding issues or contaminant exposure, but coatings are not viable options for roofs with problems related to surface preparation. If workers cannot prepare surfaces so coatings will adhere properly, they should not apply a coating.
Reputable coating manufacturers can assist you with construction of mock-ups and adhesion testing procedures during project planning to determine appropriate surface-preparation procedures, priming needs, and product selection. These procedures are always prudent if any questions exist about the ability of a coating system to bond to a given roof surface.
Also, based on an anticipated life of 20-25 years for solar panels, coating a roof before installing solar panels actually might increase the risk of requiring the roof to be recoated before the end of the solar panels' useful service life.
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