On a 20 hour notice. I met with a Roofer and agreed on the price and had him and the team come to pour hot Tar on an area that is about 70-100sq/ft that is almost flat for water proofing. The slight incline directs the rain water to the gutter. I was no able to be on the rooftop while they were working because they pour hot Tar and there is only one access point to the rooftop. They told me that it will be possible to walk on it within in 24 hours. But I left it for 3 days and when I checked it, it was still not dry. It has been 10 days now and it is till not dry. The Gutter is clogged with the Tar as well. When I called him three days after it was poured he told me that it will not full dry until the weather gets cold. I read online that it takes 30 days for Roof Tar to dry. If rains then it will cause a disaster before it dries. Can anyone give be advice on this and what to do about the gutter. I think the blockage is only the 1st couple of inches. So what is the best way to remove it after dries?

I live in Portland, Oregon and it rains a lot here. I have a composite roof that is 17 years old and I want to treat it with something to remove moss. I have a power-washer and 20" extension wand and I'm wondering if I can use it to de-moss my roof without having to stand on it. I don't like walking on my roof and it's steep. Was thinking that I could either add some de-moss solution to the power-washer and use the wand to spray it over my roof. Or simply hook the extension wand up to water line and mix in some solution to de-moss the roof, but not sure it will have enough pressure to reach the top without the power washer and the right nozzle. Any other thoughts? Surprised someone has not designed a drone that can fly over a roof and drop de-mossing pellets all over it.