Understanding the Repairability Assessment Method for Asphalt-Composition Shingle Roofs

Asphalt-composition shingle roofs are prevalent due to their durability and cost-effectiveness. However, they are not immune to damage from environmental factors like hail and heavy winds. Traditionally, assessing whether to repair or replace damaged roofs has been challenging, often leading to costly and unnecessary full replacements. 

The Repairability Assessment Method offers a systematic approach to evaluate the extent of damage and determine the most feasible solution. This blog explores how this method can streamline decision-making and ensure more accurate and economical roofing solutions.

What is the Repairability Assessment Method?

The Repairability Assessment Method is a structured approach used to evaluate the condition of asphalt-composition shingle roofs and determine the most effective repair strategy. This method systematically quantifies the damage using specific metrics such as damage rate and damage ratio, providing a numerical basis for decision-making. 

By focusing on whether repair actions will further damage the roof, this method helps ensure that repairs are feasible and economically justifiable without compromising the roof’s integrity or future performance.

Key Components of the Method

The Repairability Assessment Method revolves around several critical elements that enable precise evaluation:

Damage Rate

This metric quantifies the number of shingles damaged during the assessment relative to the total number inspected. It provides a straightforward numerical value indicating the extent of damage.

Damage Ratio

Calculated by dividing the damage rate by the total number of shingles assessed, this ratio helps determine the impact of repair actions on the roof's overall integrity.

Evaluation of Repair Actions

The method includes a systematic review of how repair actions might propagate further damage, assessing whether the intervention is likely to harm surrounding shingles.

Quantitative and Repeatable Assessment

By standardizing the assessment process, this method offers repeatable, objective criteria for making repair decisions, minimizing subjectivity and inconsistency found in other approaches.

Step-by-Step Guide to Performing a Repairability Assessment

Conducting a Repairability Assessment involves a methodical approach to ensure that each step contributes effectively to the overall evaluation of the roof’s condition. Here’s how to perform this assessment:

By following these steps, roofing professionals can make informed, strategic decisions that prioritize both cost-efficiency and the longevity of the roofing system.

Challenges and Considerations

While the Repairability Assessment Method offers substantial benefits, there are several challenges and considerations to keep in mind:

Skill Level Required

This method demands a high level of expertise from the evaluator, often requiring a professional engineer or a highly skilled roofing contractor.

Environmental Factors

The method must be adapted to different environmental conditions which can affect the assessment's accuracy, such as temperature extremes that impact shingle flexibility.

Equipment and Tools

Proper tools must be used to ensure accurate measurements and minimize potential damage during the assessment process.

Time Consumption

The process can be time-consuming, as it requires detailed inspections and careful calculation of damage ratios.

Subjectivity Reduction

Despite its structured approach, some level of subjectivity remains in the decision-making process, which could influence the outcome.


The Repairability Assessment Method is a pivotal advancement in the roofing industry, offering a structured, quantitative approach to determining the best course of action for damaged asphalt-composition shingle roofs. 

Providing a clear framework to evaluate repair viability helps property owners and professionals avoid unnecessary costs and extend the lifespan of roofing systems. Adopting this method can lead to more sustainable practices in roofing maintenance, ensuring decisions are both financially sound and environmentally considerate.Discover the power of precision with Mission PLC. Don’t let roof damage hold you back—get accurate, cost-effective solutions tailored to your needs. Connect with our expert team today and make the smart choice for your property.

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