This algae growth usually begins as small spots and then eventually becomes visible streaks.
Black tar on roof.
Pros and cons of roofing tar.
Roofing tar is a sticky black substance used to waterproof roofs before shingles are applied or used on flat roofs to improve their ability to resist water damage.
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Coal tar must be refined and processed to meet standards for roofing use.
Roofing tar is a dark oily mixture used on flat roofs to fix leaks.
It is made from coal tar and petroleum byproducts.
While doing little harm to your shingles the black streaks caused by the algae are unsightly.
Sometimes the tar accidentally gets on objects or fabrics and the longer it sits there the harder it dries often making it difficult or challenging to remove it.
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Roofing tar is often used for tar and gravel roofs or to fix leaks on a roof.
Both durable and waterproof roofing tar is a versatile material.
Roofing tar also called mastic or cement plays an important role in roofing repair and installation.
While you may have been able to replace a missing or broken shingle or piece of chimney lead easily before now you have a mess of dried cracking tar on your roof.
The most common type is known as gloeocapsa magma also known as blue green algae.
Although these dark spots and ugly black streaks on your roof may look like dirt mildew soot or mold what they really are is algae.
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Excessive and improper use of the sticky stuff however can leave behind unsightly stains on.
Typically this material is a dark and oily mixture made from coal tar and petroleum byproducts.
Read on to find out how to remove them.