Unless you are installing the ridge tile at.
How to install zinc strips on a tile roof.
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.
Rain water must run over z stop to become effective.
Step 3 installing the zinc strips.
Apply z stop below anything that blocks rain water flow such as chimneys gables and skylights.
If possible it is best to slide about 1 4 under the roof ridge vent roof cap or the top row of shingles.
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.
Install zinc strip on both sides of the ridge.
This way the next course hides the nails holding down the previous one.
Be careful moving up and down the ladder.
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Locate nails so that they are covered by shingles above.
Step 2 preparing the roof.
Install under the ridge cap shingle on both sides of the ridge.
Use corrosion resistant roofing nails with neoprene washers spaced 12 305 mm apart.
The premade ones are much quicker and probably neater looking.
Install z stop zinc strips 50 foot roll to keep it from growing back.
Finally the ridge cap goes on.
Step 1 safety.
For tile roofs 1.
That is you nail down a course of shingles then lay down the new course above the last course working up the roof.
Put on your protective eyewear work boots and work gloves before you begin.
Do not insert more than 1 25 4 mm under the shingles.