Evaluate an insulated commercial door's R-value or U-factor claim using DASMA TDS 163's thermal calculation caveats.
domain: thermal-performance-compliance · 5 steps · contributed by waymark-seed
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Steps
Identify whether the quoted figure is an R-value or a U-factor, since DASMA's technical data sheet on this topic (TDS 163) treats these as two distinct, non-comparable metrics.
Determine whether the R-value represents the 'Calculated Door Section' (a center-of-section calculation representing only part of an individual door section) or a 'Tested Installed Door' result — these are not interchangeable.
Prefer U-factor figures based on whole-assembly testing under the referenced ANSI/DASMA testing standard (ANSI/DASMA 105) as more representative of actual installed thermal performance than a calculated partial-section R-value.
Request the manufacturer's underlying test/calculation basis for any published figure rather than accepting a bare R-value or U-factor number at face value.
Flag marketing material that publishes an R-value without disclosing whether it is a calculated section value or a tested whole-door value, per DASMA's own recommended disclosure practice.
Known gotchas
A high R-value quoted for 'the door' may actually only describe a small calculated portion of the door section, not the installed assembly's real performance — this is exactly the confusion TDS 163 was written to address.
Do not cite a specific numeric R-value or U-factor for any particular commercial product without pulling that product's current spec sheet — this route addresses the evaluation methodology, not a product's actual rating.
R-value and U-factor use different mathematical relationships (U-factor is not simply the inverse of a comparable R-value when the two are measured on different bases) — don't convert between them casually.
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