That is you nail down a course of shingles then lay down the new course above the last course working up the roof.
How to install zinc strips on a tile roof.
Apply z stop zinc strip 50 foot roll by butting it up against the ridge cap against both sides of all roof peaks see graphic.
Install z stop zinc strips 50 foot roll to keep it from growing back.
Step 1 safety.
Step 3 installing the zinc strips.
This way the next course hides the nails holding down the previous one.
If preferred the zinc strip can be glued in place using a high grade exterior construction adhesive.
For tile roofs 1.
Locate nails so that they are covered by shingles above.
If possible it is best to slide about 1 4 under the roof ridge vent roof cap or the top row of shingles.
Install zinc strip on both sides of the ridge.
The premade ones are much quicker and probably neater looking.
Step 2 preparing the roof.
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You can cut strips of zinc flashing copper and lead work too and slide them under a course of roof shingles to kill lichen and moss growing there or you could just buy these premade strips from shingle shield.
Put on your protective eyewear work boots and work gloves before you begin.
At the ridge before a ridge cap goes on you also nail down the zinc strips placed so they will protrude beyond the ridge cap.
Finally the ridge cap goes on.
Use corrosion resistant roofing nails with neoprene washers spaced 12 305 mm apart.
Unless you are installing the ridge tile at.
Do not insert more than 1 25 4 mm under the shingles.
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.
Rain water must run over z stop to become effective.