Removing Stains On Asphalt Shingles

A clean roof can increase a home’s curb appeal. If regular roof maintenance is not performed, stains could form on the shingles. Because stains can come from a number of different sources, local Middlesex County roofers will help homeowners identify the origin of the stains and devise a plan to prevent further staining.

In general, contractors will need to identify the type of stain in order to determine the best way to fix the problem. The type of stain can be identified based on its color and source. For example, black or dark brown stains may be caused by algae or fungal growth while rust stains are generally red or red-brown in color and usually only appear below metal roof components. Dark black stains, which often look like stains caused by algae, could be caused by extractive bleeding.

Algae stains are cosmetic and generally do not cause damage to the asphalt shingles themselves. These stains can be removed by using a chemical cleaner; however, this is only a temporary solution, and the algae will most likely return. While many homeowners may wish to clean the stains themselves, working around chemicals on the roof can be dangerous. Additionally, the wrong chemicals can cause damage to the roof shingles. Contractors can help clean off the stains and prevent the algae from returning by installing a strip of metal along the roof ridge; the metal is toxic to algae and will inhibit their regrowth.

Rust stains can be removed using oxalic acid. While the treatment for the roof stain is generally simple, the rust stains will only continue to reappear if the source of the problem is not fixed. Rust stains may be caused by flashing, pipes and other metal components. The easiest way to keep the roof free of rust stains is to routinely hose the roof down, though there are also sealants available.

Extractive bleeding may be an indication that the shingles were not manufactured properly. Most contractors do not recommend removing the stains as power washing or other forms of cleaning could further reduce the life of the shingles. It is recommended that higher-quality shingles be installed when the time comes to replace the roof.

Whenever a homeowner has a problem with their roof that potentially affects the roof’s appearance or integrity, it is highly recommended that they get a contractor involved. While most stains will not affect the roof’s structure, it is always better to combat any issues before the roof’s integrity becomes corrupted. The roofers at Fortified Roofing of Middlesex County NJ can answer your questions regarding gutters or roof repairs.

Term from the roofers at Fortified Roofing, Middlesex County NJ:

Extractive bleeding

Extractive bleeding occurs when the shingle’s black pigment bleeds into the shingle mat, causing the shingle to become darker in appearance. In some cases, the pigment may bleed onto the surface of the shingle and run down the roof.

The roofers of Middlesex County, NJ from Fortified Roofing answer a common question:

What are the easiest ways to prevent roof stains?

If the roof stains are not caused by defective products, the easiest way to prevent stains is to have the roof routinely washed. Because walking around on the roof can be dangerous, homeowners have the option of employing a roofer to remove dirt and debris and wash the shingles annually or bi-annually.

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