Black Tar On Back On Roof Shingles

As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see.

Black tar on back on roof shingles.

While you can apply roofing tar at lower temperatures it will not properly set until it reaches 70 degrees. While you may have an isolated incident that lead to a broken or missing shingle sometimes this can be a sign that you have other damaged or weakened areas elsewhere on your roof. The algae feed on the limestone in shingles. The most common type is known as gloeocapsa magma also known as blue green algae.

After application press the tab down firmly to start the bond. The ideal temperature is 70 degrees f. If you have a simple leak in your roof and know exactly where it is then you can apply roofing tar over the affected area to create an effective patch. Laminated shingles require 4 spots of cement per shingle.

Roofing felt also known as tar paper serves as both an extra layer of protection between the shingles and the plywood and as a temporary moisture barrier until all the shingles are in place. To hand seal lift each tab of a 3 tab shingle and apply two spots of the cement under each tab. Prevent shingle damage from wind uplift. The shiny black strips form the glue line on the shingle.

When to tar a roof. Each spot should be approximately the size of a quarter and placed 1 to 2 from each end of the tab and near the bottom. What is the purpose of the glue strip on asphalt roof shingles. 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.

Simply slapping some tar on there instead of having a professional come out to assess could mean that you re leaving other damaged areas open to the elements as well. Our photo left shows a typical 3 tab asphalt roof shingle this one is made by gaf. 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. 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.