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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.

While you can technically install new roof sheathing over an old layer, it is generally not recommended for several reasons. Installing new sheathing over old can trap moisture, which may lead to future problems, especially in humid climates. It also adds significant weight to the roof structure and prevents you from inspecting the original sheathing for rot, mold, or other damage.

However, in some cases, if the old sheathing has been thoroughly inspected and is in excellent condition with no signs of rotting, warping, or damage, a roofer may install new sheathing over it to add strength and stability. Despite this, the more common and recommended practice is to remove the old roof sheathing entirely before installing a new layer, as removing it is not a difficult task.

Signs that you need a new shed roof include curling or buckling shingles, saggy or droopy spots, or plant life growing on your roof. Likewise, if you notice wet spots inside your shed after it rains or snows, you most likely have a leak problem that won’t go away on its own. It’s a good idea to replace your shed roof if it’s showing signs of wear before your entire shed becomes damaged.

If your roof leaks in heavy rain, that means the roofing is compromised and will need to be inspected and likely repaired. Small holes or cracks in the roofing material or flashing may not be noticeable in dry weather or even in a drizzle, but if they suddenly become noticeable when heavy rain comes, it likely means that small amounts of water are leaking in at other times, potentially causing damage.