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A roof coating is a product applied to a compatible assembly, not a universal way to fix leaks or renew every covering. Identify the roof type, condition and manufacturer’s position before considering it.
What a compatible reflective coating may do
A specified reflective coating on an appropriate roof assembly can reduce absorbed solar heat. EPA describes liquid-applied cool-colored coatings among cool-roof technologies, while noting that annual energy effects depend on climate and the building and can include a winter heating penalty. A cooling function is not proof of leak repair, restored service life, guaranteed savings or suitability for installed asphalt shingles.[1]
Identify the roof before the coating
Establish the covering or membrane, existing coatings, substrate condition and the proposed product. A protective coating for a designed foam-roof assembly is not the same thing as spraying foam or painting any existing roof.
Asphalt shingles need a specific boundary
ARMA advises against field application of coatings or rejuvenators over installed asphalt shingles and identifies possible performance risks. Do not treat a general coating benefit list as approval for that covering.[2]
Find moisture and defects first
Ask how leaks, wet layers, drainage, adhesion and deteriorated areas are evaluated. A coating does not establish that concealed material is sound or replace repair of an incompatible or failed detail.
Specify compatibility and preparation
The proposal should name the actual product, approved substrate, preparation, repairs, application conditions and manufacturer requirements. Product-specific instructions, not a universal internet method, govern.
Questions for a written proposal
- What exact roof assembly and product are involved?
- How are defects, moisture and adhesion assessed?
- Which repairs and preparation are included?
- What performance, maintenance and warranty terms actually apply?
Read the roofing questions and compare the actual scope rather than a universal coating promise.
Related information
References
General homeowner information, not a property-specific assessment. Requirements and product instructions vary. Leave roof access, diagnosis and hazardous work to qualified professionals.