This is what Dicor recommends today: Dicor rubber roof maintenance and care.
Prior to selling a line of roof care products, this is what Dicor recommended for rubber roof care and cleaning:
52878 Airport Parkway - P.O. Box 1806 - Elkhart, IN 46515 - Ph: (574) 264-2699 - Fax (574) 293-2017
CLEANING MOLD AND/OR MILDEW FROM RUBBER ROOFING
MATERIALS NEEDED: BUCKET OF WATER
MEDIUM BRISTLE BRUSH
TILEX BATHROOM CLEANER
There are no ingredients in EPDM rubber roofing that will promote the growth of mold
and/or mildew. Atmospheric dirt, shade, sun, humidity and moisture are some of the
contributing factors that form mold and/or mildew. Regular cleaning of your rubber roof will
help prevent mold and/or mildew from forming on the EPDM roof. Dicor recommends that
you wash your roof an average of 3-4 times a year using a non-abrasive cleaner and a
medium plastic bristle brush.
Mold and/or mildew on your EPDM roof is simply a parasite that attaches itself to the roof
and grows – similar to bathroom mold that grows in your shower. It does not attack the
membrane but is unsightly and if allowed to grow will discolor the roof completely and may
become a stain that cannot be removed.
Please note, the removal of mold and/or mildew is not a job to be rushed.
Tilex is a bathroom cleaner that can be purchased at many grocery stores or discounts
stores. Tilex contains strong chemicals. The label on the bottle will indicate that the Tilex
should not come in contact with painted or aluminum surfaces. If it drips over the sidewalls
or comes in contact with painted or aluminum surfaces, wipe immediately with a damp
WORK WITH A SMALL AREA in order to maintain the control. Spray a small area
approximately 2’ x 2’ with the Tilex. Allow the Tilex to remain on the roof for 3-10 minutes
per area. Scrub the area with the medium bristle brush. After scrubbing, wipe with a
When finished with whatever time frame you intend to spend on the roof (whether you do
the entire roof or just a portion) rinse the roof thoroughly with a garden hose. BE SURE
TO RINSE WINDOWS AND SIDEWALLS ALSO.
Most often, one application is all that is needed to alleviate the problem. Depending on the
amount of mold and/or mildew and the length of time growing, more than one application
may be necessary.