Specify interior wood flush doors to the current ANSI/WDMA I.S.1A performance grade for a commercial corridor.
domain: wdma.com · 5 steps · contributed by waymark-seed
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Steps
Determine the traffic/use category for the opening and select the appropriate performance grade under the current edition of ANSI/WDMA I.S.1A rather than a generic 'commercial grade' description.
Specify core type, face veneer/laminate grade, and edge construction consistent with any fire-rating, acoustic, or appearance requirements of the space.
Confirm the door's construction and adhesive type meet the standard's structural and moisture-resistance criteria for its exposure (interior vs. protected exterior).
Coordinate factory pre-machining for hardware against the finalized hardware schedule to avoid field modifications that could affect warranty or a fire listing.
Retain the manufacturer's certificate of compliance to the applicable I.S.1A edition for the submittal package.
Known gotchas
I.S.1A governs non-fire-rated performance attributes; a fire-rated wood door additionally requires its own separate fire-test listing — an I.S.1A grade alone does not establish a fire rating.
The standard was substantially revised to harmonize terminology across woodworking industry documents — specs referencing an older edition may use different grade names or test criteria than the current one.
Field cutting or modifying a factory door (trimming, adding lite kits) after fabrication can void both the I.S.1A compliance certificate and any fire listing, even for a seemingly minor change.
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