Don't replace it if you can re-ply it.
All surfaces must be thoroughly cleaned to remove dirt, grease, mill scale, loose rust, chalk, and any other contaminants that can reduce adhesion. Remove loose or excess mortar, efflorescence, laitance, and concrete form release compounds that reduce adhesion.
PREVIOUSLY PAINTED SURFACES
Scrape loose, scaly, peeling paint and sand the edges smooth. If the paint is glossy, sand to dull the surface.
Tighten or replace loose fasteners. Remove scaling rust and pressure wash to achieve a clean, sound roof surface.
ENCAPSULATE CORROSION AS NEEDED
Apply Rust Converter specially formulated to neutralize and halt further metal roof corrosion.
SEAL SEAMS AND FLASHINGS
Reinforce all seams, flashings, and penetrations with high tensile strength fibers fabric saturated with a fluid membrane.
FOR PREVIOUSLY PAINTED SURFACE: APPLY THE FIRST LAYER
Apply two crossed coats by squeegee/trowel, brush, and or airless spray and use a roller to fill uneven surface.
APPLY THE FINAL LAYER
Apply the second application of fluid membrane finish to the roof. This results in a seamless, highly reflective "cool roof" that remains durable, weathertight, and pliable. Impervious to many airborne corrosives.
Note: Priming immediately after cleaning the surface is imperative to prevent dust or dirt from accumulating and flash rust (rust that occurs within hours) from forming.
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