LOSS OF GRAINS
After a while, the asphalt shingle that contains the protective granules hardens. This results in the detachment of the granules and causes the appearance of small cracks and fissures on the surface.This happens to all roofs of shingles, but excessive degranulation damages your roof and takes away several years of life, this also leads to an accumulation This is your responsibility now to examine your roof for any apparent damage. If you ever discover something, it is important to plan repairs so that the situation does not get worse.
Cornering of shingle corners occurs when roof ventilation is not optimal, causing the shingle to overheat. Sometimes it can also be due to too high humidity inside. Once the corners are in this position, strong winds and freezing over the winter will cause much faster damage to your roof.
This is one of the most obvious apparent damages to spot on your shingle roof. Once the shingle is corrugated, the wind can pull the corners easily.
Most of the time this problem is due to poor ventilation inside the roof but sometimes it can also be the result of a still water deposit in the roof.
Tearing parts of your shingle is one of the most serious problems, locations where the shingle has broken down is a considerable weakness and increases the risk of water infiltration.
This problem is sometimes caused by snow removal from your shingle. winter roofing or the exposure of your roof to strong winds, the top of the roof is the place most at risk.
It’s not just our lakes that are falling victim to algae infestations: the asphalt shingles on some roofs are being affected as well. Much to the dismay of homeowners, they provide fertile ground for a particular species of algae. Problem is, as they proliferate, the algae leave brown or black streaks on rooftops that can be a real eyesore.
The algae develop under sustained humid conditions—for example, on rooftops that are seldom or never exposed to sunshine, or that are on houses surrounded by large trees. The resulting stains are often mistaken for simple dirt, have no impact on the shingles’ quality and don’t significantly affect their service life, according to the Canadian Asphalt Shingle Manufacturers’ Association (CASMA*). But who wants a roof in mottled shades of brown and black?
Zinc and copper: algae’s enemies
There is unfortunately no permanent solution or foolproof preventive action to deal with the problem of roof algae. Their development can be delayed, however, at the time of a home’s construction or when re-roofing. The key is to use copper or zinc: experience has shown that algae growth is curtailed when rainwater washes surfaces containing these metals.
At least one manufacturer markets a range of so-called algae-resistant asphalt shingles, backed by a five- or ten-year limited warranty under which the homeowner will be reimbursed “reasonable” costs of cleaning subsequent to discolouration attributable to algae. These shingles incorporate copper, which has antifungal properties, into their granules.
The onset of the problem can also be delayed by installing a strip of zinc or galvanized sheet metal (which is coated in zinc), at least as thick as one row of shingles, near the ridge of the roof. “As the metal ions oxidize and erode off of the metal strip, they wash down the roof, inhibiting cellular algae growth,” explains the CASMA. The Association adds that this is why stains on roofs discoloured by algae tend to be less apparent, or completely absent, in areas below metal attachments that contain zinc, such as flashing or pipes.
Note, however, that these materials’ effectiveness in countering algae proliferation is temporary, and also depends on climatic conditions: no rain equals no preventive washing!
Source : https://www.caaquebec.com