Most Duro Last roofs that are installed are usually gray or white in color. As everyone knows white can get dirty or “show” different from other colors when it comes to a roof. Even thought Duro Last is almost maintenance free, there are some things you should know about your roof material to help you care and clean it. You do not have to clean your roof besides keeping debris off of it but some people do like to to keep their roof clean and looking like new, no harm in that.
The first thing that you need to know is that PVC membrane is not compatible AT ALL with asphalt. It can bleed into the membrane and is impossible to get out. If you currently have an asphalt roof and are thinking of getting a Duro Last roof, make sure to talk with the contractor to ensure when removing the asphalt is does not get into contact with the membrane. This also means not to use any asphalt products on the membrane for anything, sealants, fillers, and caulks must not contain asphalt. Sometimes contractors or building owners try to patch roofs with asphalt and that is a no no when you have a PVC membrane roof. Make sure anyone that does anything on the roof for other repairs like HVAC units do not use asphalt or asphalt based products either. If any does come in contact clean it immediately but remember the next care tip below when trying to clean it out.
The next important thing is to not use any solvents on the membrane, these will cause the membrane to soften and takes away the effect the membrane is supposed to have. If you go asphalt on the membrane do not use a solvent either this will cause the asphalt to melt worse on the membrane. You can use a non-solvent cleaner for the membrane if water alone will not help clean it.
Sometimes a roof can get pretty dirty especially when there are walls around the roof and lots of trees around. If you want your roof bright again or to help retain its reflectivity, the recommended items to use to scrub any built up dirt is a soft bristle brush and the non solvent cleaner. You can sweep the water into the drain system or let dry. You can spray the membrane with a hose if that is accessible to you on the roof. Most roofs do not get too dirty unless in an area where factories or other industrial places are around. Usually most flat roofs just get a lot of dirt that has blown around or leaves from trees.