Roof leaks must be repaired before coating, Jaymar Roofing says

Jaymar Roofing in Slidell, Louisiana says commercial and low-slope roof coatings should be applied only after leaks, wet insulation, flashing damage and drainage problems are identified and addressed. The guidance matters because coatings are meant to protect an already sound roof surface, not fix hidden defects underneath.

Why it matters: - Roof coatings can extend the life of a commercial or low-slope roof, but only if the existing roof is sound enough to serve as a base. - Unrepaired leaks, trapped moisture and drainage problems can undermine coating performance and keep roof damage moving underneath the new surface.

What happened: - Jaymar Roofing of Slidell, Louisiana outlined the steps it says should happen before a roof coating is applied to an existing roof system. - The company said roof leaks should be traced to their source first, then damaged materials, flashing, wet insulation and drainage issues should be evaluated and repaired as needed. - Owner Jules Albert III said a roof coating should not be viewed as something that simply gets painted over an existing leak. - Albert said the condition causing the leak needs to be identified first, including damaged roofing materials, flashing, seams, penetrations and moisture beneath the roof surface.

The details: - A water stain inside a building may not show where water is entering the roof. - Water can travel through insulation, decking or other structural materials before it becomes visible indoors. - Roof inspections typically look at seams, flashing, penetrations, drains, curbs, transitions and areas with visible deterioration. - Open seams, punctures, cracks and damaged flashing can all create pathways for water. - Commercial roofs with mechanical equipment require extra inspection because pipes, ducts, curbs and other penetrations break up the roofing surface. - Damaged components may need repair before coating work begins. - Loose seams may need to be secured or repaired. - Cracks and punctures may need patching. - Flashing around penetrations may need repair if deterioration has created an opening. - Areas that have separated, blistered or lost adhesion may also need evaluation. - The goal is to create a suitable substrate for the coating instead of asking the coating to correct underlying defects. - Moisture trapped in insulation or other roof components can complicate coating projects. - Covering wet materials with a coating does not remove that moisture. - Moisture surveys or other evaluation methods may be used to find suspected wet insulation. - Affected materials may need to be removed and replaced before coating work continues. - Leaving wet insulation in place can contribute to continued deterioration and interfere with roof performance. - Many roof leaks develop around transitions and penetrations rather than in the middle of a roof field. - Common trouble spots include HVAC curbs, pipes, vents, skylights, walls, parapets, drains and roof edges. - Flashing helps maintain a watertight transition in those areas. - When flashing cracks, separates or deteriorates, water can enter the roof assembly. - Standing water can also affect pre-coating decisions. - Low-slope roofs depend on drainage systems to move water away from the roof surface. - Blocked drains, inadequate slope, settlement or other conditions can cause ponding after rainfall. - Ponding may show up as staining, dirt patterns, algae or repeated deterioration. - A coating can cover the surface, but it does not fix the reason water is collecting. - After repairs, the roof surface generally must be cleaned and prepared for coating. - Dirt, biological growth, loose material, oils and other contaminants can interfere with adhesion. - Cleaning methods depend on the roof system and the coating manufacturer's requirements. - The roof must also be dry before many coating products can be applied. - Some roof materials may need primers or additional preparation depending on the substrate and coating system. - Manufacturer requirements typically set acceptable surface conditions, application rates, temperature ranges and other installation rules. - Roof coatings are applied as liquids, so rain, temperature, humidity and surface moisture can affect installation and curing. - In South Louisiana, changing weather can make scheduling an important part of coating work. - A dry roof can become wet after an afternoon thunderstorm, and high humidity can affect curing for certain materials. - Jaymar Roofing said a coating becomes part of the existing roofing system rather than replacing what is underneath it. - The company said that makes the condition of the original roof important.

Between the lines: - The article frames roof coating as a preservation step, not a shortcut around repair work. - The practical message is that coating projects succeed when contractors treat leak diagnosis, moisture removal and substrate prep as part of the job, not extras. - The emphasis on South Louisiana weather suggests timing and surface dryness can be just as important as the roof repairs themselves.

What's next: - Roof owners considering coating work should first confirm why water is entering the roof and whether hidden damage remains in the assembly. - Repairs, drying, cleaning and surface prep should happen before any coating product is installed. - Jaymar Roofing said that approach helps determine whether the existing roof is a suitable foundation for a coating system.

The bottom line: - A roof coating protects a roof surface that is already fit for service. It does not replace leak repair, wet insulation removal or flashing and drainage fixes.