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It’s possible for a roofing estimate to change after the initial assessment, but in most cases, it shouldn’t. There’s always the risk that something unexpected will happen that causes prices to go up, like discontinued materials or your roofer discovering previously hidden damage to your decking when ripping off the old roof. However, experienced roofers should account for these circumstances in their initial estimates. Roofing contracts are binding, so always check your contract for language about how and why your numbers could change.

Cool roofs last for roughly 15 to 30 years. You can install a cool roof coating over an existing roof, but keep in mind that this might not be worth it if your roof is near the end of its life expectancy. If your roof isn’t near the end of its life, adding a cool roof coating can make your existing roof more energy-efficient and help it last longer, so you’ll have to weigh the pros and cons.

You can damage your shingles if you use the wrong type of paint on them. You should always use acrylic latex paint specifically formulated for shingles. Other types of paint may trap moisture, which can cause bigger problems like rot and mildew. Considering that roof replacement costs $9,100 on average, it’s definitely best to avoid making this mistake.

Besides using the right paint, remember that painting your shingles will require increased maintenance.

Green roofs are incredibly long-lasting. Some have life spans of up to 40 or 50 years. Since the roofs help to protect the rest of your home's roofing system, they can also extend the life of your existing roof.

Regular maintenance and inspections will help you get the most out of your green roof and ensure it lasts as long as possible.