If you are dealing with damp spots appearing on your business ceiling, contact a roofer ASAP. Depending on the kind of roof type you have, you might need to hire a specific kind of company. I had a problem with my roof, which was made from rubber, causing many people to leave my shop. They felt that it looked tatty and cheap.
So I got a roofing company to come out, and their EPDM installers in London were able to fix the problem for me quite quickly. I then found that all I had to do was get my roof repaired by a plasterer, and my roof looked so much better for it. Clients stopped treating my shop like it was ill, and it helped me to get my business up and running once again.