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If you have issues with wind uplift on your roof as well, you may look into metal roofing. Interlock, for instance, developed a roofing system where each shingle is locked on all four sides, making it a very resistant to windstorms. The inorganic nature of metal also helps to keep you roof attractive for decades.
You are welcome to read more on our website: www.interlockroofing.com
One alternative that most homeowners are not aware yet is reviewing your Roofing System. Along with the attic insulation, the type of roof you have can make a huge difference on how energy efficient your home is.
Most roofing materials (especially asphalt composite roofs) absorb solar energy and transfer heat to your home (requiring more air-conditioning during summer). On the other hand, energy efficient Metal Roofs are reflective and emissive. They bounce most of the sun's visible and UV light - meaning less heat transferred to your home. Independent studies show energy savings of up to 25%.
The Interlock Metal Roofing System is Energy Star certified (US only). More than energy efficient, our roofs are truly sustainable, being made of up to 95% recycled material, reducing the dependence of asphalt and stopping the cycle of old roofing material going to landfills. It is a lifelong solution that is better for your home, your pocket and the planet.
What kind of roof do you have? Is it an asphalt roof? The average lifespan of asphalt composite roofs is 10-15 years. Depending on how extreme the weather is in your area, some roofs made with temporary roofing materials may start to fail as soon as eight years.
The most common cause of this type of dark spots is a variety of blue/green algae called a Gloeocapsa Magna. Ths stains often evolve to a moss buildup, as the algae increases moisture. That is not only an appearance problem, as algae proliferation may shorten your roof life and increase energy costs. (You mentioned you recently added more insulation to your attic. Not only that was probably not the cause, but potentially, even the need for the extra insulation is already a sign of an underperforming roof.)
There are products on the market to clean it, but keep in mind the algae also reduces the composite integrity, so removing it may still keep your roof exposed.
It would be advised to call a professional inspector to do a roof and attic inspection. It can identify any other related issues and give you a timeframe of how much longer can your roof can hold.
Also refer to your warranty, keeping in mind each manufacturer have a different levels of protection.
When it's time to re-roof, you may want to consider other lifelong roofing materials (such as metal).
Feel free to contact us if you have any other question.
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