How Moss Damages Your Addison, IL Roof Over Time
Moss is a non-vascular plant that requires moisture to survive. On north-facing roof slopes, shaded areas under overhanging trees, and roof sections with limited sun exposure, the combination of moisture retention and low UV intensity creates ideal growing conditions. Once established, a moss colony grows outward and thickens progressively with each wet season.
The rhizoids that anchor moss plants physically penetrate the granule surface of asphalt shingles. As rhizoid structures grow, they work beneath the leading edge of each shingle course, lifting the tab away from the shingle below. This breaks the adhesive seal strip that provides wind resistance and water shedding. Water driven by wind or running in sheet flow under heavy rainfall can then infiltrate beneath these lifted shingles and reach the underlayment or deck below.
Beyond direct physical damage to shingles, moss colonies retain moisture against the shingle surface. This sustained moisture exposure accelerates granule loss, breaks down asphalt oxidation resistance, and causes the surface to crack and become brittle over time. In freeze-thaw conditions common to Addison, IL winters, moisture trapped by moss beneath shingle edges expands during freezing, further lifting and cracking the shingle bond. Most major shingle manufacturers explicitly state that biological growth voids their material warranty, making timely removal a financial imperative as well as a structural one.
Lichen, which typically appears as flat, crusty gray-green growths, is even more destructive than moss because its root-like structures penetrate deeper into the shingle surface and chemically bond with the granules. Lichen removal requires more careful technique to avoid pulling granules off along with the organism. Our technicians are trained to distinguish between moss and lichen growth and apply the appropriate removal approach for each.
How Jones Tilley Removes Moss Safely in Addison, IL
High-pressure power washing is the fastest way to remove moss from a roof and also the most likely to cause accelerated damage. High-pressure water blasts remove moss along with the granules it is anchored to, leaving bare asphalt spots that deteriorate rapidly under UV exposure. We do not use high-pressure washing on asphalt shingle surfaces for this reason.
Our moss removal process uses soft-washing techniques that apply a biodegradable biocidal treatment at low pressure. This kills the moss plant at its root structures, allowing it to dry out and detach from the shingle surface over a period of weeks to months depending on moss thickness. In many cases, rainfall over the following season will wash the loosened material clear naturally. For heavier infestations requiring more immediate clearing, we use gentle manual brushing after biocide treatment has had sufficient dwell time to kill the growth.
Assessment
We map the extent of growth, identify species, and assess any shingle damage already caused by root intrusion before selecting the appropriate treatment approach.
Treatment
Low-pressure biocidal application covers all affected surfaces. The solution penetrates the moss colony to the root structures, killing growth without damaging shingle granules.
Prevention
Zinc or copper strip installation at the ridge allows rainwater to carry protective metal ions across the roof surface, inhibiting future biological growth for years.
Keeping Moss Off Your Addison, IL Roof Long-Term
Moss removal is only half the solution. Without a prevention strategy, moss will re-establish within one to three years on roofs with favorable growing conditions, requiring repeated treatment cycles. Effective long-term prevention combines physical modifications to the roof environment with ongoing chemical inhibition.
- Zinc or copper ridge strip installation releases metal ions with each rainfall that wash across the roof surface and inhibit moss and algae establishment. These strips typically remain effective for ten or more years and represent the most cost-effective prevention measure available.
- Tree trimming to increase sun exposure on north-facing slopes and reduce leaf debris accumulation on the roof surface creates a less hospitable environment for moss establishment.
- Gutter cleaning and downspout maintenance ensures that water does not pond at eave edges where moss frequently re-establishes first after treatment.
- Annual roof inspection allows early-stage growth to be treated before it matures into an established colony that requires more intensive intervention.
We discuss prevention strategy during every moss removal appointment and include zinc or copper strip installation as an option in all moss removal proposals. The preventive investment is consistently less expensive than repeated removal treatments over a ten-year period.
Evaluating Shingle Condition After Moss Removal
Once moss growth is cleared, the underlying shingle condition becomes visible for proper assessment. We inspect for granule loss concentration in previously covered areas, shingle tab lifting along affected courses, exposed black asphalt spots from granule depletion, and any cracking or brittleness in shingles that were under sustained moisture from moss-retained water. This assessment is included in every moss removal service and provides homeowners with an honest picture of remaining shingle service life, helping to plan for roof replacement appropriately rather than on an emergency basis.