Roof experts say black streaks are caused by an algae known as gloeocapsa magma. Airborne spores deposit it on your roof, where it soaks up plenty of sunlight for photosynthesis and munches on the limestone filler in your shingles. … Humid areas of the country are most susceptible to dark streaks from algae.

How do you remove black stains from shingles?

A mixture of trisodium phosphate (TSP), bleach, and water will also remove stains. Oxygen bleach lightens stains as well and is less harmful to the environment, but it doesn’t produce as immediate or dramatic an effect as chlorine bleach.

Are black shingles bad?

Yes, it is true that black or other darker-colored shingles will make your attic and home hotter. A hotter home is a very valid concern for Dallas, Plano, and other North Texas homeowners because temperatures on your roof can climb well over 150 degrees in the summer.

Why are my shingles turning black?

Answer. Those black streaks on your roof shingles are most likely an algae called gloeocapsa magma, or as it is more commonly referred to, a blue-green or black algae. Algae is a solid deposit of spores and dirt, another form of mold. … Do NOT pressure wash your roof; one wrong angle and you can damage the shingles.

How do I get rid of black mold on my roof?

You may spray wash the roof with 1 part water and 1 part bleach to clean off the algae. Let is sit for around 60 minutes before rinsing. If you find bleach and water solution weak for your moldy roof, you may use trisodium phosphate. Mix a cup of it for every gallon of water.

What is the best cleaner for roof shingles?

of laundry strength liquid chlorine bleach and water. This is the best way to clean a roof if you have asphalt shingles. After spraying the roof with the mixture, allow it to sit on the surface for 15 to 20 minutes before rinsing thoroughly with clean water.

Will bleach damage roof shingles?

Will Bleach Discolor Shingles? No, bleach will not cause discoloration in your shingles, or asphalt shingles. Especially not if you apply bleach with the 50-50 mixture that we recommended above, then you’re definitely not going to deal with any discoloration.

How do you clean shingles with bleach?

Mix equal parts of bleach and water in the ratio of 50:50 to form a bleach cleaning solution. Pour the solution in a garden hose sprayer. Climb the roof using a ladder and spray the shingles with the solution. Leave the solution on the surface of the roof shingles for 15 to 20 minutes.

Can you power wash shingles?

It’s generally not necessary to pressure-wash a shingle roof for the purpose of removing ordinary dirt and leaves, and pressure-washing can potentially damage the shingles’ coating of protective grit. … Scraping is more destructive to shingles, which makes pressure-washing your safest bet.

What kills gloeocapsa magma?

Roofing shingles with Scotchgard™ Protector contain copper granules that are an effective poison to gloeocapsa magma. Over time, as the copper is slowly released, the granules on each shingle kill the algae before it can take hold.

Article first time published on

Does a black shingle roof hotter?

Black and dark-colored roofs. In general, dark-colored roofing materials will absorb the heat and cause your attic and/or the top of your house to be warmer than a lighter colored material.

Do black roof shingles fade?

Asphalt shingles do indeed fade, but the rate at which they lose color can vary, especially when it comes to shade. Dark gray shingles will fade to lighter grays more easily than shingles that start out in lighter shades. … Shingles often fade in uniform degrees, but there’s no guarantee.

Should I go with a black roof?

Black roofs are known for being great for cold climates and also being a subtle way to reduce heating bills in the cold. … Modern houses often have multiple paint colors on their exterior, so if you’re feeling a white home with black trim, go for it. It’s all about making your home feel like your own personal paradise.

How expensive is it to remove black mold?

The black mold removal cost of an unfinished basement can really vary. It could be as little as $500 or as high as $4,000 depending on the scope and size – AKA how much mold is present and how much area it covers. If the attic and ducts are involved, the cost for those generally ranges from $2,000 to $6,000.

How do you remove mold from asphalt shingles?

The most effective method of cleaning algae and moss from a roof is with a 50:50 mix of laundry strength liquid chlorine bleach and water. Apply with a sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes, and then rinse thoroughly with low pressure water.

What causes mold on roof shingles?

Mold is usually the result of algae growth. In rainy, humid weather, algae (and other botanical growths like moss and lichens) can take hold and grow quickly on your roof. This causes the roof materials to remain damp, which promotes rot. When rot sets in, so can mold.

Is roof Cleaning a good idea?

One reason to clean your roof is to extend the life of your shingles or other roofing material. While algae isn’t harmful to asphalt shingles, moss is, according to ARMA. … Luckily for you, the National Roofing Contractors Association advises against any DIY work on your roof, including cleaning it.

Does Spray and forget work on roofs?

A: Yes, Spray & Forget will work on almost any exterior surface and actually works faster on these surfaces then on roof surfaces. Apply 5 gallons of water to 1 gallon of Spray & Forget mixture to these surfaces. Green stains will disappear in 1-3 days and black stains in 1-8 weeks. Do not rinse!

What do professionals use to clean roofs?

Sodium Hypochlorite, Sodium Percarbonate or Sodium Hydroxide for Roof Cleaning? The most popular chemical used today by roof cleaners is still “bleach” or sodium hypochlorite. It is also the chemical of choice of ARMA, the Asphalt Roofing Manufacturers Association.

Is baking soda safe for roofs?

Dirt or particles on roofs can create places for moss to start growing, so the primary preventative each year is to clean your roof. … Baking soda will raise the pH, which moss doesn’t like. Baking soda washes off easily, so more than one application may be needed each year.

Can you use wet and forget on shingles?

Wet & Forget contains no hazardous bleach or acidic chemicals so it won’t harm your roof’s shingles. Wet & Forget cleans thoroughly so surfaces stay cleaner, longer.

When should I remove moss from my roof?

If your roof has sprouted a moss infection, you can remove it before it becomes serious enough to impact the performance of your roof. Moss is tough and typically you will not be able to remove it by hand. However, you can use a chemical solution to loosen the moss without damaging the shingles.

How much does it cost to power wash a roof?

The most common method of cleaning a roof is a high-pressure wash. This service costs between $0.20 and $0.70 per square foot and is good for removing built-up dirt and debris.

What causes Gloeocapsa Magma?

Gloeocapsa Magma, also known as black mold, is a type of bacteria that is responsible for causing black stains and streaks on roofs. It feeds off moisture and “organic bacteria food.” After accumulating over time, the black stains begin to appear. Causes of Gloeocapsa Magma include: … This type of bacteria is airborne.

Does wet and forget remove black spot?

Wet & Forget Outdoor is an easy-to-use mildew and mold stain remover. Wet & Forget’s gentle and effective cleaning formula works with the wind and rain to remove ugly black and green stains and leaves your outdoor surfaces clean and growth-free for up to one year – or longer.

How do you prevent mildew on shingles?

Clear and efficient gutters prevent water from backing up onto your roof or sitting stagnant in one spot. Upgrading your shingles. Look into using algae-resistant asphalt shingles, or add zinc or copper strips to your roof to prevent both algae and moss.

Why are roofs dark colors?

In general, lighter-colored roofs reflect away heat rays from the sun, but dark-colored roofs absorb much of that heat and transfer it into the rooms below. So, yes, black roofs do attract more heat. … This quality means even tan asphalt shingles may welcome more heat into your home than a dark brown metal roof.

Does the color of your roof matter?

Darker colors absorb more heat, and warmer roofs make it easy for snow and ice to slide right off. Lighter colors reflect sun rays, keeping roofs cooler and helping homeowners in warmer climates save a little on their energy bills.

Is a black metal roof a bad idea?

Is a black metal roof a dumb idea? Certainly not. Black will absorb more heat than light and neutral colors, but a roof need not be white to be considered a cool roof. Color does play a part, but how much heat gets into your home is a combination of different factors.

Are black shingles more expensive?

Most black roof shingles are made from asphalt. You can then layer each shingle so that you receive an almost three-dimensional look for your house. Asphalt shingles tend to be the least expensive of any type, and they are widely available. You can expect to pay about $90 per square.

Are black roofs hot?

Light-colored roofs reflect heat while black colored roofs absorb heat and transfer it into your house. Most people prefer dark-colored roofs because they warm the interior of the house. … On the contrary, if you live in an extremely hot area, a light-colored roof will keep your home cool.