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Asphalt shingles have varying thicknesses across the length, so failing to stagger shingles from one row to the next will leave you with bulges and bumps if the thicker sections stack on top of each other. Not only is this unappealing, but it increases the risk of water intrusion. Stagger each new row by 6 inches to avoid this issue.

Generally, snow guards are not required by building codes unless a local municipality has included them in their code. Even though they are not usually required, snow guards are highly recommended, especially for metal roofs in areas that see significant snowfall throughout the year. They act as a barrier to large loads of snow that can slide off a roof, potentially injuring people and damaging property.

Most roof leaks occur where shingles meet or where there are sealants or seams in the materials. This is common around skylights and at any point there is a break in the roof such as corners and edges. Roofing materials are incredibly strong and resistant when overlapping, but any change in that can cause gaps where water can enter.

In most cases, yes, you will need to be home while your roof inspector checks your roof. The inspector will be able to complete the exterior assessment without input from you, but they will also need access to your attic space to look for signs of leaking, like pest infestation, water stains, mold growth, and visible holes leading to the exterior. They will also check the roof trusses, rafters, and supports to confirm their structural integrity. Roof inspections usually take between two and three hours, so plan accordingly.