The company arrived promptly at the booked time to remove moss on my roof. The young man that arrived was pleasant and professional and he went immediately into action to start the job. Another worker arrived later to assist. The roof had very heavy moss coverage over 1/4 of the area with the rest having lighter coverage. I was amazed that both men were able to tackle that heavy work…They were both hard workers. The roof now looks beautiful without a speck of moss to be seen. I will certainly be using Thomson Roof Treatment again.