We like to surround the work area with fabric runners and movers blankets whenever possible; this protects the roof and makes clean up easier at the end of the job. Another factor that is to be considered is working in hot weather.
Ashphalt composition shingles need to be sprayed down with water in hot weather. This is done in order to keep the shingles cooled off. If the shingles get too hot, they can be damaged by workmen walking on them.