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No, you should not use a pressure washer or power washer on roof shingles, including asphalt shingles. The high water pressure is too strong and can damage the shingles by loosening their adhesive, forcing water underneath them, or causing them to fall off. The safer and better option is soft washing with a pump sprayer. For best results and to avoid damage, consider hiring a local roof cleaner to clean your shingles safely.

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.

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.

In most cases, it is best to leave icicles on your roof and allow them to melt naturally. You should only consider removing them if they are heavy enough to cause damage to your home or pose a risk to people below. Since removing icicles can be dangerous, it is recommended to hire a professional for the job if you have immediate concerns. To prevent the issue from recurring, you should address the underlying cause, such as improving your home's insulation or installing roof heating coils.