Weather & Performance
10 roofing terms in this category.
- Abrasion resistanceAbrasion resistance is a material’s ability to withstand surface wear caused by friction, scraping, or repeated contact. High abrasion resistance matters because it directly affects a roofing material’s durability and long-term performance, especially in areas exposed to foot traffic, wind-blown debris, or harsh weather. Low abrasion resistance increases the risk of premature surface damage, leading to leaks, costly repairs, or reduced service life.
- AbsorptionAbsorption is the process by which roofing materials take in and retain water, vapor, or other liquids. High absorption can lead to increased moisture retention, which may cause material degradation, reduced thermal performance, and a higher risk of leaks or mold. Selecting low-absorption materials is critical for long-term roof durability, especially in climates with frequent rain or humidity.
- Accelerated weatheringAccelerated weathering is a laboratory process that simulates long-term exposure to environmental conditions—such as sunlight, moisture, and temperature—to evaluate how roofing materials or assemblies degrade over time. This matters because it provides rapid, controlled insights into a product’s durability and resistance to climate-related stressors before real-world deployment. Results help manufacturers, specifiers, and building owners assess potential risks, compare products, and make informed decisions about material selection and warranties.
- AgingAging is the gradual decline in a roofing system’s performance properties due to exposure to weather, UV radiation, and environmental stressors over time. As aging progresses, materials can lose flexibility, strength, and water resistance, increasing the risk of leaks or premature failure. Understanding aging helps inform maintenance schedules, warranty expectations, and replacement decisions to manage long-term roof performance and costs.
- Blow-Off ResistanceBlow-Off Resistance measures a roofing system’s ability to withstand wind forces that could dislodge or remove roofing materials. High blow-off resistance is critical because inadequate performance can lead to roof failure, water intrusion, and costly damage during storms or high-wind events. When evaluating roofing options, consider local wind exposure and code requirements to minimize the risk of material loss and structural compromise.
- Capillary ActionCapillary Action is the movement of liquid through narrow spaces without external force, driven by adhesive and cohesive forces. This phenomenon matters in roofing because it enables water to travel upward or sideways into seams, joints, or porous materials, potentially bypassing gravity-based drainage. Understanding capillary action is critical for preventing hidden moisture intrusion and designing effective waterproofing details in roof assemblies.
- Class 4 impact resistanceThe top hail rating: a 2-inch steel ball from 20 feet, twice, without cracking — UL 2218's hardest class.
- Class A Fire ResistanceThe top roof fire rating — severe flame and burning-brand exposure without igniting the structure.
- Ice DamA ridge of ice at the eave that traps meltwater and forces it under the roof covering.
- Snow guardsDevices that keep rooftop snow from avalanching off a slippery metal roof all at once.