On average, roof cleaning businesses charge about $1,500 for a single cleaning. Larger roofs, however, can be charged up to $2,800. Smaller services, like in-depth gutter cleans, can carry extra charges. How much profit can a roof cleaning business make? A well-off roofing business can...
You would need to have a plumber stop up various ends of the piping system and then perform a smoke or pressure test. A simpler, less expensive alternative to start with might be to simply try painting some sealant around all of the pipe joints that are visible. Once that's dried ...