It looks like they have nailed through the zinc in to the roof.
Roof zinc strips installation.
Using 2 5 or 3 5 wide zincshield install by butting the zinc strip against the ridge vent roof cap or the top most row of shingles at the roof ridge.
This picture shows nails through the zinc strip.
In order to install zinc strips you must either nail them in over the asphalt shingles or break the seal and install them under a strip of shingles.
On roofs with moss algae mildew or fungus the existing growth must first be removed by pressure washing or brushing then the root systems must be chemically treated and destroyed see magazine articles for bleach solution.
If possible it is best to slide about 1 4 under the roof ridge vent roof cap or the top row.
What is zincshield.
Z stop a zinc strip 50 foot roll that s easily installed on your roof acts as a barrier to roof moss algae and fungus growth protecting the roof its appearance and value.
Installation instructions how zinc strip works zinc strip does not kill moss or mildew it helps inhibit their growth so that in most cases the need for roof cleaning is reduced or eliminated.
Wouldn t that allow water through the roof.
Preventing roof moss with zinc strips in this video this old house general contractor tom silva shares tips for keeping a roof free of moss and mold by this old house.
Zincshield pure zinc strip to avoid ugly roof stains from moss algae fungus and mildew 50 foot roll 2 5 includes bag of zincshield nails made in the usa 4 7 out of 5 stars 146 36 99 36.
It works with any wood or composition roof.
A zinc strip can be installed on a roof to prevent moss from growing the zinc prevents the growth of the moss as the strips become corroded from moisture.
Zincshield is a 99 2 pure zinc strip a trace of copper is added to provide strength and proper hardness in 50 foot rolls.
This article gives instructions for installing zinc strips at the ridgeline to inhibit moss.
Three widths are available.
The corrosion releases the zinc.
The exposed zinc strip will oxidize.
The zinc strip is installed along both sides of the ridge of the roof with most of the strip left exposed.
A good product to consider is roof be clean see www roofbeclean for product information.
I don t actually have a roof.
Installing zinc strips to prevent moss growth is a leak liability says the asphalt roofing manufacturers association.
The moss is incapable of digesting the moisture containing chemicals in zinc and is then incapable of growing.
Z stop is a zinc roof moss algae and fungus inhibitor that is applied in strips to old or new roofs.
2 5 3 5 and 6 0 see faqs for specific applications for each width.