Is See Streaks Where The Roof Is Drying Unevenly

Once the algae have infested your roof you ll see black spots begin to form.

Is see streaks where the roof is drying unevenly.

This algae growth usually begins as small spots and then eventually becomes visible streaks. If it isn t all the way dry it can still look uneven after another coat of paint. It can be mistaken. You re outside taking care of some yard work and you suddenly notice streaking on your roof and siding.

This is the first sign that you need to schedule a treatment for your roof. The algae are usually brown to. The most common type is known as gloeocapsa magma also known as blue green algae. Near the metal flashing that s around chimneys and roof vents.

Why you re seeing black spots or streaks. You could spray several light coats of finish over the stain but the adhesion between the finish stain and wood will not be very high. 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. This week s question comes from robert.

If you see streaks in your paint while it s still wet there is a high probability that they re going to be there when it dries. If you try to finish over it with a brush some of the stain will probably come off on the brush and give the surface an uneven look. The algae have a weakness and it s the copper and zinc coating used on the sheet of metal flashing which is toxic and kills the growth. This blackish algae creeps it way across neighborhood roofs gradually turning your home s asphalt shingles an ugly dark brown or black.

So unfortunately you re going to have more work ahead of you to get rid of them. Less paint means a lighter coat resulting in uneven paint streaks on your walls. Thankfully the fix to this doesn t involve sanding. Although it may look like mold or fungi these unsightly black streaks or smear like stains may indicate a type of roof algae known in technical terms as gloeocaspa magma.

Black in color which results in a streaked dirty looking rooftop. You ll typically see gloeocapsa magma forming on areas of your roof that don t receive direct sunlight. Algae growth causes a dark discoloration. If you look even closer you re bound to notice that the black streaks are everywhere but one place in particular.

Stains and streaks can show up easily on roofing and siding over time thanks to a whole host of nuisances including mold mildew and plain ol dirt. When staining soft maple kitchen doors and drawers from a millworks shop the painter applied a special walnut stain directly to the raw wood. You ve never really taken a good look before but yes it s there.