Due to fire safety concerns, most states limit the number of shingles permitted on a roof to two. However, you can still find roofs with three or four layers. A contractor will recommend a complete replacement if you already have two or more layers.
Roof safety is a system of preventative and protective measures for roof maintenance and repair. Practicing roof safety on the job will prevent personal injuries and structural damage.
Each laborer on a steep-slope roof with unprotected sides and edges at least 6 feet above a lower level must be protected by guardrail systems with toeboards, a safety-net system, or a personal fall arrest system.
In some cases, it can take at least two weeks and up to four weeks. Ensure that you address the source of the leak to ensure that you are solving the problem and not continuing in circles.