Represent a residential garage door's thermal performance accurately using ANSI/DASMA 105 U-factor data instead of a bare R-value claim
domain: dasma.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Confirm whether the manufacturer publishes a whole-door U-factor tested per ANSI/DASMA 105, versus a section-only R-value calculation
Explain to customers that U-factor reflects the complete installed door system's heat transfer performance, while R-value typically reflects a single insulated section in isolation
When marketing thermal performance, prefer or include the U-factor figure so comparisons across brands are apples-to-apples
Avoid presenting a section R-value as if it represents the whole installed door's performance
Note the specific door model/configuration a published figure applies to, since thermal ratings vary by size and glazing options
Known gotchas
R-value and U-factor are measured differently (single section vs. whole installed system) and aren't directly interchangeable — conflating them in marketing can mislead customers
Not all manufacturers publish U-factor for every product line; confirm what test data actually exists for the specific model before making a claim
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