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Yes, moss can be dangerous for your roof if left in place to grow without treatment. The moss soaks up and holds moisture. Having a constantly damp roof could lead to problems with rot for the parts of the roof that consist of wood. Additionally, a patch of thick moss may draw insects and birds, which could damage the roof. Thick moss could block the roof’s drainage system. Water then may back up after a rainstorm and cause further damage that could eventually lead to roof repair expenses or the cost of roof replacement.

Though cedar shakes often get confused with shingles, there are a few key differences between wood shakes and wood shingles. For one, cedar shingle prices are lower, although shingles are less durable than wood shakes. Cedar shakes are thicker than shingles (shingles range from about 3/8 to 1/2 inches thick, compared to 1/2 to 3/4 inches thick for shakes). Wood shakes are handmade, while shingles are usually machine-made. Also, wood shakes work better on steeper roofs than shingles do. While the cost of cedar shingles is more budget-friendly, there are many great reasons to choose shakes.

Generally, roof flashing is installed under the shingles to create a watertight seal and prevent moisture from seeping in and causing damage. However, the exact placement can depend on the type of flashing. For instance, with step flashing, the shingles and flashing overlap each other, meaning the flashing is technically both over and under the shingles. Flashing also typically goes beneath the house siding and is often not visible from the ground.

No, there’s no specific building code that requires a roof overhang. However, installing your roof with the standard 2-inch overhang is good practice, as it helps direct runoff away from your fascia boards and roof decking and into your gutters. Some overhang is especially important in areas that see heavy rainfall and snowfall, as the risk of water getting under the roofing material and causing water damage is much higher.