Your roof is a very integral part of one’s home structure and appearance; while the discolored roof shingles make their presence felt, it negatively impacts aesthetic value and longevity. Discolored roof shingles can mean anything ranging from a benign aesthetic problem to wider structural malady. Being privy to the common causes of roof shingle discoloration allows for maintenance to be informed by prognosis, thus prolonging its life.
Here are the following aspects about discolored roof shingles which will help you to address the underlying problems before they escalate into more significant damage. These are some of the 6 roof discoloration causes.
1. Algae Growth
Many roof shingle discolorations result from the formation of algae, and most notably from Gloeocapsa magma. This kind of algae is found in warm and damp climates, feeding on the limestone filler frequently incorporated in asphalt shingles. In the process, this results in the formation of black streaks on the shingles giving the roof a dirty and discolored appearance.Knowing what causes streaks on roof shingles can help you protect your roof.
What causes dark streaks on roof shingles?
- Sporangial algae are dispersed through the air and so easily float from roof to roof.
- It is most often prevalent in areas with a high humidity index.
- For instance, algae feed on the shingles and this also means that their proliferation can be problematic.
Prevention and Solution:
- The installation of algae-resistant shingles – those that incorporate copper or zinc granules can effectively deter the proliferation of algae.
- Regular maintenance and cleaning of the roof is essential (especially in humid climates), and will help reduce algae growth.
- Zinc or copper strips can be fitted at the roof ridge. The rain will wash the ions down the roof so there will be no further formation of algae.
2. Moss and Lichen Growth
Another primary cause of discolored shingles is moss and lichen accumulation on the roof surface. Although not as slimy as algae, these organisms are far thicker, and they may eventually harm your shingles or roof in general. It also holds moisture against the shingles- hence jeopardizing the materials’ strength through eventual formation of mildew and rot.
What causes streaks on roof shingles?
- Moss and lichen flourish in cool, moist environments; particularly in shaded regions of the roof.
- Roofs with overhanging trees and roofs that are exposed to minimal sunlight are more prone to moss growth.
- Extended moisture retention may deteriorate the shingles and cause further discoloration.
Prevention and Solution:
- Regular cleaning of roof area.
- Eliminating the branches that hang too close to the roof, allowing for more sunlight to penetrate.
- Spraying the roof with a moss-resistant treatment to prevent moss growth or putting metal strips like those used in algae prevention.
3. Water Damage and Moisture Retention
When rain water does not drain effectively or when gutters are damaged, this results in staining of roof shingles. When water gets on the roof, it infiltrates under the shingles, stains, and molds the roof and even rotting the roof deck. This leads to the formation of rather unattractive stains over time and compels shingles to deteriorate faster than they should.
Why It Happens:
- An improper roof slope or a lack in adequate drainage system leads to accumulation of water.
- When the gutters or downspouts are full, water can find its way back onto the roof area.
- Damaged shingles provide a way for water to get into the underlayment to cause stains and other damage.
Prevention and Solution:
- Ensure proper roof slope and gutters should be clean and efficient.
- Many roofs have cracked shingles or flashing that allow water into the building; it is necessary to remove and replace these sections.
- Call for a drip edge so that water will be properly directed away from the house.
4. UV Radiation and Sun Exposure
Heat, light, and constant exposure to the UV rays also contribute to shingle roof color change over a period. The degradation occurs as the sun breaks down the roofing material, causing color fading, cracking, and brittleness, especially on the surfaces in direct sunlight.
What causes roof discoloration?
- Roofing material such as shingles exposed to continuous sunlight become photodegraded because the sunlight weakens the shingles.
- The darker the shingles, the more quickly they absorb heat, thereby accelerating the aging process.
- In the long run, the granules can wear away and discolorations become visible and shingles perform poorly.
Prevention and Solution:
- Select either fiberglass or organic shingles that have UV resistance features or ability to withstand sun rays for long term.
- Select those shingles that have a lighter hue of color since they tend to reflect more sunlight than they let in.
- Regular inspections can identify areas which show signs of great wear and you can fix or replace them in time.
5. Airborne Contaminants and Pollution
Ambient airborne pollution and contaminants are also known to abrade and cause roof shingle discoloration. The factors which affect the physical appearance of the shingle surfaces include the presence of dust, dirt, pollen and industrial emissions which give the shingles a dirty blackish look.
Why It Happens:
- Pollution degradation is more predominant in roofs that are in urban or industrial facilities.
- Grit and grime penetrate the roof and it becomes a dusting and moisture accumulation breeding ground.
- Acid rain brought on by industrial emissions can not only cause further deterioration and discoloration of the shingles.
Prevention and Solution:
- Cleaning activities to get rid of dust deposits on the stained substrates.
- Using protective shingles on roofs that have a proven quality for resisting various pollution levels.
- In order to reduce the buildup of aerial debris on the roof, you should wash the roof regularly.
6. Tree Debris and Organic Matter
Leaves, branches, pine needles and any other debris on the surface of roofs lead to discolouration of roof shingles. When this organic matter accumulates on the roof, it provides breeding ground for mold, mildew and algae depositing stains on the roof.
Why It Happens:
- Debris from overhanging trees accumulates on the roof, trapping moisture and encouraging mold growth.
- This is especially true in areas of the roof that do not receive sunlight. Moisture is retained for longer periods, leading to deterioration.
- Leaves, needles and twigs break down and produce a layer of tarry substance on the roof surface which discolors the shingles.
Prevention and Solution:
- Cut-away branches, clean up debris that may be accumulating on your roofs or in your gutters.
- One should ensure he/she cleans the roof from organic matter before further damage is caused.
- One may also wish to cover the gutters with gutter guards to ensure that no intruding materials clogs the drainage channels.
Conclusion
The discoloration of roof shingles is not only an aesthetic squalor, it could also be an indication of secondary problems that may make your roof deteriorate faster. Stains on roof shingles can stem from algae/moss development, water intrusion or even basic sun harm and each requires its unique treatment.
To avoid these, it is advisable to engage a professional for routine roof check-ups and repair works and also practice preventive measures like use of algae-resistant roof shingles, cutting of trees with excessively hanging branches. Maintenance not only makes your roof visually appealing, but also ensures that the roof remains serviceable to protect your house for many years.
Knowing what causes dark streaks on roof shingles and major roof discoloration causes will enable a homeowner to effectively manage his or her roof to avoid your from looking ugly and reach its operational end in the process.
If you have a black streak on your shingles, or stained areas, don’t sit back and watch it get worse! At River City Roofing, we take our time to establish the cause of roof shingle discoloration before making any recommendations. From algae problems, moisture, to other forms of contamination our skilled contractors will restore the glamor of your roof and safeguard your house.
Contact River City Roofing now for a no cost estimate and discover just the way we can help protect your roof going forward. Maintain the aesthetics of your home and the effectiveness of your roof now — book an appointment with us today!