Limestone is not a "filler" in modern day shingles. Shingle manufacturing facilities are extremely hot and usually very humid. Manufacturers use talc mixed with the granules to keep the granules and hoppers dry, to prevent them from getting clogged. The best performing talc the manufacturers have found is made from limestone.ABC Supply sells the zinc strips. Great product in some markets. It is a type of algae and the reason it seems to have spread throughout the country and not just in moist environments is due to its tendency to feed on limestone which has become the main filler used in modern day shingles.
As a former building contractor and a dumpster company owner, I simply can not count the number of twelve to twenty year old, twelve to twenty thousand dollar premature roof replacements I hauled to the dump.Yeah, by taking 10 years of life away from the roof :laughing:
Hope there is no landscaping below.Here's how its done. Pool shock chlorine which is high content bleach