GAF describes a brown residue associated with asphalt surfaces and environmental conditions such as sun, dew and limited rain. It is generally cosmetic and temporary, but the cause should be identified before treatment.
GAF technical bulletin: “tobacco juicing”.
What this means for your roof
GAF describes a brown residue associated with asphalt surfaces and environmental conditions such as sun, dew and limited rain. It is generally cosmetic and temporary, but the cause should be identified before treatment.
A useful question for your contractor
Ask for an inspection if residue is accompanied by leaks or material deterioration.
Ask for the answer to be tied to the actual roof condition and the exact product being installed. Keep the agreed repair or installation detail with your estimate and project photos.
Bulletin revision: February 1, 2021. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
This homeowner summary explains the cited bulletin. The complete manufacturer document and current product instructions govern the installation details. A requirement for one manufacturer or product should not be transferred to another without checking.