ROOFNOW™ Knowledge Center (RNKC) is an independent, education-first reference platform dedicated exclusively to roofing knowledge.
RNKC documents roofing systems, materials, mechanics, performance factors, and failure modes in a neutral, non-commercial format for long-term reference.
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Explore thousands of educational articles covering roofing systems, materials, engineering principles, diagnostics, terminology, and lifecycle performance.
RNKC Tools & Calculators
Educational models and calculators for understanding roofing systems, geometry, and building science.
The ROOFNOW™ Knowledge Center (RNKC) offers a growing collection of neutral tools and calculators designed to explain how roofing systems behave. These tools focus on geometry, physics, structural forces, material quantities, and cost structure — without recommendations, pricing, or sales influence. Results are illustrative only and intended for educational use.
All tools use clearly stated assumptions and allow neutral outcomes, including scenarios where no difference is observed.
Roofing Material Behavior Explorer
A neutral, education-only tool designed to help homeowners understand how different roofing materials behave over time — across climates, conditions, and long-term performance factors.
This tool does not promote products, recommend contractors, or provide pricing. It exists solely to support informed decision-making through unbiased roofing education.
RNKC Roofing Lifespan & Replacement Cycle Simulator
An educational simulation illustrating long-term roof replacement frequency based on commonly observed performance across North American climate regions.
This simulator applies a 12-year asphalt shingle replacement cycle, reflecting performance patterns commonly observed across North American climate zones, including regions affected by freeze–thaw cycling, prolonged heat exposure, wind events, and seasonal precipitation. A 3% annual inflation factor is included to demonstrate long-term cost escalation.
This simulator is educational and illustrative only. Actual roofing performance varies by material selection, regional climate conditions across North America, structural design, installation quality, and maintenance practices.
RNKC Roof Condition Self-Assessment
An educational scoring model that estimates overall roof condition using commonly observed indicators across North American climates.
This assessment is educational only and does not represent a diagnosis. Actual roof condition varies by material, climate exposure, construction, and maintenance history.
RNKC Roof Pitch & Surface Area Converter
Educational converter illustrating the relationship between roof pitch, angle, and surface area using basic geometry.
This tool performs geometric conversions only. It does not provide recommendations or account for structural, material, or environmental considerations.
RNKC Plywood Sheet Quantity Calculator
Educational calculator estimating the number of standard 4×8 plywood sheets required to cover a given surface area.
This calculator uses standard 4×8 sheet dimensions (32 sq. ft. per sheet). Results are rounded to the nearest full sheet (up or down) and do not account for layout efficiency, cuts, openings, or installation method.
RNKC Roofing Squares Calculator
Estimates roof surface area in roofing squares (1 square = 100 sq. ft.)
RNKC Asphalt Shingle Bundle-to-Square Converter
Educational converter translating asphalt shingle bundle quantities into total roofing squares.
This converter assumes an average asphalt shingle bundle coverage of 33.3 sq. ft. per bundle and defines one roofing square as 100 sq. ft.. Actual coverage may vary by manufacturer and product design.
RNKC Asphalt Shingle Bundle Quantity Calculator
Educational calculator estimating the number of asphalt shingle bundles required based on roof surface area and bundle coverage assumptions.
This calculator assumes an average asphalt shingle bundle coverage of 33.3 sq. ft. per bundle. Actual bundle coverage varies by manufacturer and product design. Results are rounded to the nearest full bundle (up or down) and do not account for starter strips, ridge caps, or layout efficiency.
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