Today I would like to illuminate what it is that actually causes those Black Stains on your roof.
It all started about 10 years ago when the roof shingle manufacturers decided that they need to reduce the amount of oil based products in the shingles to save money. In order for the shingles to keep some resemblance of sturdiness they needed to add a new filler. The filler happen to become Limestone. Unfortunately limestone happens to be a very good food for the algae. Consider that these type of shingles also tend to hold more moisture than the older paper/asphalt/ceramic shingles of 20 years ago, now the shingle is perfect for algae colony growth.
From what I have read, the the algae infestation started out in the Southeast and spread to the Midwest and now the Northeast. Once the algae creates it UV protective coating, you begin to notice the black spots and streaks on the roof. These stains will increase each year until the color of your roof shingles are long gone.
There are mixed signals coming out of the community as to the harmfulness of these stains to your roof and household residents, but let's consider this:
1) My wife Debbie and I looked at many different shingle colors before we settled on Sienna Red to match the house color. How upset would you or we be if that Sienna Red is now replaced by Black Spots and streaks. Talk about lack of curb appeal!!
2) The Black Spots are a sign that the colony has developed a UV protective cover so it can grow. As the black spots and streaks cover your roof they are taking away the reflective power of the shingle heating up your residence and increasing your energy costs. Some sources claim that it will increase your energy expense by 20% OUCH!
3) The algae is feeding on the limestone filler in your shingles! They are eating the roof on the biggest investment you have ever made. As they eat the limestone filler the shingles granular coating comes lose and washes away with the rain. Now you have increased heat attraction from the black algae coating and the reflective granular coating is wearing away, can you see how they come up with a 20% increase in energy expense.
4) This is the worst reason of all, because of the additional moisture, loss of granular coating, additional heat concentration, your shingles are now experiencing premature aging! Do you believe this, now you have to replace a 20 year shingle in 8 years!!!
Look, this is great for your local roofer, they are busier than ever replacing roofs before their time and selling you shingles that now contain an algicide, at a premium price. The bottom line is that if you just clean the roof before it gets out of hand you will save a truck load of money.
Yes, that's right! It's wise to get rid of those algae before they totally ruin your roof. It's much better to work hard on your roof shingles than pay a lot of money for their replacements.
ReplyDeleteEugene Caul
Sometimes homeowners forget that taking roofs for granted can cause unsightly stains. Dark spots, without a doubt, are caused by algae, fungi, dead leaves, tree sap, and shingle coloring that run down the roof. Also, consider the fact that the normal life of a roof is approximately 15 yrs. If it goes beyond that, there is an urgent need to replace the roof.
ReplyDeleteElizabeth Hoffnung
Those black spots are commonly caused by algae. There are several options for cleaning algae off the shingles. One of them is to use professionally manufactured products to rid the stains and the streaks. Simply follow the instructions written on the container. Make sure to keep in mind the safety measures when using such chemicals, as well.
ReplyDeleteTameka Lauricella
Thank you for sharing this valuable information. These black spots are definitely unpleasant to look at. Whatever the reason, it would be best to replace the shingles, and choose materials that are algae-repellent. Although the repairs maybe costly, it would pay off in the long run, especially for the aesthetic value of your property. [Clinton Comes]
ReplyDeleteAlgae cause the formation of molds on the outer and inner part of a roof. It is best to prevent it from spreading because these will be harder to remove if left untended for some time. Another reason to get rid of them is the fact that they’re a primary cause of respiratory illnesses.
ReplyDeleteLue Madson
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