Granule loss happens when a shingle roof’s outer layer is eroded over time. Generally, it’s expected of every asphalt shingle roof, and not always a cause for alarm — though certain conditions can make it so. In today’s post, local roofing contractor M&A Exterior Home Improvement explains the nature of asphalt shingle granule loss, and when it requires roof repair.
Asphalt shingles are encrusted with an outer layer of granules embedded on backing material, usually made of flexible fiberglass or recycled paper pulp, the latter known as “organic” shingles. During manufacture, large sheets of the backing material are soaked in hot asphalt. The granules, made of crushed rock and various additives, are pressed onto the still-hot asphalt. The sheets are then cut into shape and packed, ready for distribution.
Asphalt is a great substance for waterproofing, but it’s vulnerable to UV and storm damage. This is where the granule layer comes in: it serves as a hard-wearing layer that shields the asphalt from sunlight and impact. The crushed rock provides the colors, which makes it less prone to fading as opposed to color coatings.
Granule loss is to be expected, even with new asphalt shingles. In fact, you’re likely to find a significant amount of sediment in your gutters during the roof’s first year, as the rain washes away loose granules. The amount of granules should taper off over time. The first couple of years after installation is crucial for any roof, as this is when manufacturing and installation issues become apparent. If a significant amount of sediment is still found in the gutters — at least an inch deep — it could indicate a problem. You may notice additional signs like “bald” or dark spots, which indicate an exposed asphalt layer. The contrast is more apparent on light-colored roofs.
Excessive granule loss can be a reason to be worried, as there can only be two conditions that can cause this unprompted by storm damage or something similar. The first is a manufacturing defect. Incorrect settings during manufacture may have prevented the granules from adhering to the backing material. To fix this, the defective shingles will have to be replaced under warranty. The second is aging, which happens on old roofs and is a sign that you need to replace it.
Give our team at M&A Exterior Home Improvement a call to find out more about our roofing services. Give us a call at (757) 779-5244, or fill out our contact form to schedule a consultation. We serve communities in Norfolk.