The people at Thomson Roof Treatment were very professional and the price was very fair. They attended the site on the day and time they promised, and quietly, and without interruption completed the Job. The roof was manually de-mossed thoroughly prior to the chemical application, and all residue moss and other foreign material was removed from the eves troughs and surrounding grass areas. The roof looks fantastic. I would not hesitate to recommend Thomson Roof Treatment to anyone contemplating this procedure.