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What Causes Roof Shingles to be Discolored?

Shingle discoloration can be caused by a variety of factors, which may include but are not limited to:

Algae Growth

A common cause of dark streaks and stains on roof shingles, especially in humid environments. The algae, such as Gloeocapsa magma, can feed on the limestone filler in asphalt shingles.

Moss Growth

Moss can grow on roof shingles in damp, shaded areas, causing green to black discoloration. Besides being unsightly, moss can hold moisture against the roof surface, potentially damaging the shingles over time.

Fungal Growth

Fungi and mold can also cause discoloration, often resulting from excessive moisture or poor ventilation of the roof.

Pollution and Dirt

Over time, dirt, dust, and pollutants from the air can settle on shingles, causing them to appear discolored or dingy.

Manufacturing Defects

In some cases, discoloration can be the result of a manufacturing defect in the shingles, such as uneven distribution of granules or poor quality dyes.

Age and Weathering

Natural weathering from exposure to sunlight, rain, and fluctuating temperatures can cause shingles to fade and lose their original color. This is a normal aging process that can lead to a uniform discoloration over time.

Water Stains

Improper drainage or leaks can lead to water stains, which may cause brown or yellowish discoloration on the shingles.

Chemical Damage

Certain chemicals, whether from cleaning solutions used on the roof or airborne chemicals, can cause shingles to discolor or degrade.

Rust Stains

Metal components on the roof, such as flashing, vents, or nails, can rust over time, and the rust can wash over the shingles during rainstorms, causing reddish or brown stains.

Addressing shingle discoloration often depends on correctly identifying the cause. Cleaning may be effective for algae, moss, and mildew, but shingles damaged by wear, manufacturing defects, or persistent growths might need to be replaced by a good roofing company like Four Seasons Roofing. Feel free to schedule an inspection to determine the cause and appropriate treatment for discolored shingles.

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Customer reviews

I absolutely LOVE my new roof. Recent windstorm did some damage to my house and I needed new roof installed fast, otherwise I was facing more damage to the inside. Alex, the owner of 4 Seasons Roofing was very professional and courtesy from day 1. Their estimator did a great job explaining me what needed to be done and what was not necessary, unlike the other guys from Thumbtack I had to come over for an estimate. They finished my project last week and I am very grateful for what they did for me on a short notice.

From the very start we knew that 4 Seasons Roofing were going to carry out our roofing project seamless. Consultation, professional advice, communication, their bid with materials and labor in detail, and execution were all solid. We we extremely satisfied with them that we also hired them to replace our windows, which was another project done well, within the budget discussed and on time! I can recommend this company without any reservations.

I absolutely LOVE my new roof. Recent windstorm did some damage to my house and I needed new roof installed fast, otherwise I was facing more damage to the inside. Alex, the owner of 4 Seasons Roofing was very professional and courtesy from day 1. Their estimator did a great job explaining me what needed to be done and what was not necessary, unlike the other guys from Thumbtack I had to come over for an estimate. They finished my project last week and I am very grateful for what they did for me on a short notice.

From the very start we knew that 4 Seasons Roofing were going to carry out our roofing project seamless. Consultation, professional advice, communication, their bid with materials and labor in detail, and execution were all solid. We we extremely satisfied with them that we also hired them to replace our windows, which was another project done well, within the budget discussed and on time! I can recommend this company without any reservations.

I absolutely LOVE my new roof. Recent windstorm did some damage to my house and I needed new roof installed fast, otherwise I was facing more damage to the inside. Alex, the owner of 4 Seasons Roofing was very professional and courtesy from day 1. Their estimator did a great job explaining me what needed to be done and what was not necessary, unlike the other guys from Thumbtack I had to come over for an estimate. They finished my project last week and I am very grateful for what they did for me on a short notice.

From the very start we knew that 4 Seasons Roofing were going to carry out our roofing project seamless. Consultation, professional advice, communication, their bid with materials and labor in detail, and execution were all solid. We we extremely satisfied with them that we also hired them to replace our windows, which was another project done well, within the budget discussed and on time! I can recommend this company without any reservations.

I absolutely LOVE my new roof. Recent windstorm did some damage to my house and I needed new roof installed fast, otherwise I was facing more damage to the inside. Alex, the owner of 4 Seasons Roofing was very professional and courtesy from day 1. Their estimator did a great job explaining me what needed to be done and what was not necessary, unlike the other guys from Thumbtack I had to come over for an estimate. They finished my project last week and I am very grateful for what they did for me on a short notice.

From the very start we knew that 4 Seasons Roofing were going to carry out our roofing project seamless. Consultation, professional advice, communication, their bid with materials and labor in detail, and execution were all solid. We we extremely satisfied with them that we also hired them to replace our windows, which was another project done well, within the budget discussed and on time! I can recommend this company without any reservations.

I absolutely LOVE my new roof. Recent windstorm did some damage to my house and I needed new roof installed fast, otherwise I was facing more damage to the inside. Alex, the owner of 4 Seasons Roofing was very professional and courtesy from day 1. Their estimator did a great job explaining me what needed to be done and what was not necessary, unlike the other guys from Thumbtack I had to come over for an estimate. They finished my project last week and I am very grateful for what they did for me on a short notice.

From the very start we knew that 4 Seasons Roofing were going to carry out our roofing project seamless. Consultation, professional advice, communication, their bid with materials and labor in detail, and execution were all solid. We we extremely satisfied with them that we also hired them to replace our windows, which was another project done well, within the budget discussed and on time! I can recommend this company without any reservations.

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