This algae growth usually begins as small spots and then eventually becomes visible streaks.
Black tar on roof.
Pros and cons of roofing tar.
Coal tar is a deep brown or black residue which is made during coal production process.
Both durable and waterproof roofing tar is a versatile material.
Roofing tar is often used for tar and gravel roofs or to fix leaks on a roof.
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.
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.
Excessive and improper use of the sticky stuff however can leave behind unsightly stains on.
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Roofing tar also called mastic or cement plays an important role in roofing repair and installation.
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Removing this tar is the only way you re going to be able to make a long lasting repair that doesn t let the rain back in within a few months or years.
Tim asks how can i clean the black stains off my roof and keep them from coming back your stains are probably caused by the airborne spores of a blue green algae.
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.
While doing little harm to your shingles the black streaks caused by the algae are unsightly.
It is made from coal tar and petroleum byproducts.
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.
Read on to find out how to remove them.
Coal tar must be refined and processed to meet standards for roofing use.
Typically this material is a dark and oily mixture made from coal tar and petroleum byproducts.