If the roof extends for more than 14 4 27 m down from the ridge where the zinc strip is installed re growth can occur.
How to install zinc strips on roof.
Posted for a friend.
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.
Step 4 maintaining the zinc strips.
Zinc strip will help control the growth of moss and mildew it will.
I conducted a fairly long term experiment by installing zinc strips on a moss covered garage roof and showed before and after photos after the zinc had sixteen months to work its magic.
I don t actually have a roof.
A good product to consider is roof be clean see www roofbeclean for product information.
You still need to remove the existing moss algae.
It looks like they have nailed through the zinc in to the roof.
The roof must be cleaned of moss and or mildew.
Copper strips however do work and should be exposed 2 and placed every 10 up the roof.
Install z stop zinc strips 50 foot roll to keep it from growing back.
Wouldn t that allow water through the roof.
By installing the strips on the ridge any water that runs over them will trickle down the roof carrying the zinc chemicals with it.
The zinc metal strips are made from a variety of metals.
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.
The strips are then coated with zinc.
This article gives instructions for installing zinc strips at the ridgeline to inhibit moss.
In november of 2011 i wrote a blog post about using zinc strips to prevent moss from growing on the roof or possibly to kill moss.
Like rooflover said the zinc strips don t work and they certainly don t work on existing roofs that already have moss algae on them.
If possible it is best to slide about 1 4 under the roof ridge vent roof cap or the top row.
These chemicals will create an environment that will prevent moss growth.