Surrey, Coquitlam, White Rock, Langley, Burnaby, Vancouver Area
Algae Resistant (AR) Shingles
Shingles are the most common type of material used for today's residential applications. There is such a huge variety of colors, shapes, sizes and warranties that can help to make it easier to find the right type of shingle for your needs.
Quite often homeowners ask us "Will my new shingles become stained as my old ones did?" The answer is "It can because staining is most commonly caused by algae."
Although sometimes wrongly called fungus, the dark stains on roofs are usually caused be Algae like we find in swimming pools and on the grout between tiles in bathrooms.
An alga staining is most prevalent in areas with significant humidity; it can make a roof unsightly. Plus the dark stains tend to absorb more ultraviolet light; which might cause some degree of additional heat build-up in a poorly ventilated attic.
To fight algae, some manufacturers make a shingle which has algae resistant granules on the weather side.
Two granules have been used for this purpose: Zinc metal and Copper Oxide coated granules. At this time, Copper Oxide coated granules is the most commonly used.