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It may require stronger cleansers or chemicals, higher-pressure spray, or scrubbing to completely remove algae from a metal roof. Start with a mild cleanser; if that doesn’t work and you're comfortable doing so, use a stronger mix of ⅓ cup of laundry detergent, 1 quart of bleach, and 3 quarts of water to gently scrub the algae with a soft-bristled brush. If algae is present across large portions of your roof, doesn’t come off with gentle scrubbing and cleansers, or is in hard-to-reach areas, this may be a job better left to a pro.

Tile roofs, including clay, concrete, and slate, are considered low-maintenance materials that require fewer repairs and less care than many other roofing options.

• Clay tiles require minimal maintenance. They stand up well to the elements and UV radiation, repel water, and do not easily stain, discolor, or fade in direct sunlight. Clay tiles do not need sealing. Maintenance is typically only required to replace cracked tiles, which can be caused by foot traffic, extreme weather, or fallen tree limbs.

• Concrete tiles are also low-maintenance but require more upkeep than clay. They need to be sealed every few years to maintain water resistance, and their color tends to fade more quickly than clay.

Aside from these material-specific needs, general maintenance for tile roofs includes annual inspections, routine gutter cleaning, and addressing repairs as they arise. A well-maintained tile roof can provide 50 to 100 years or more of protection for your home.

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.

Yes, gable vents can let water in. That being said, this usually only occurs during extreme conditions like heavy rainfall. You can prevent water from entering through gable vents by adding a screen that traps the water before it can enter.