Backport fix.

NREL · Aug 14, 2023 · f42e0a7 · f42e0a7
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diff --git a/Changelog.md b/Changelog.md
@@ -1,3 +1,8 @@
+## OpenStudio-ERI v1.6.2
+
+__Bugfixes__
+- Fixes incorrect ESRD ceiling U-factor for SFA unit with adiabatic ceiling when using SFNH program.
+
 ## OpenStudio-ERI v1.6.1
 
 __Bugfixes__

diff --git a/rulesets/resources/ES_ZERHruleset.rb b/rulesets/resources/ES_ZERHruleset.rb
@@ -456,6 +456,7 @@ def self.set_enclosure_ceilings_reference(orig_hpxml, new_hpxml)
       ceiling_exterior_adjacent_to = orig_floor.exterior_adjacent_to.gsub('unvented', 'vented')
       if @has_auto_generated_attic && multifamily_adjacent_locations.include?(orig_floor.exterior_adjacent_to)
         ceiling_exterior_adjacent_to = HPXML::LocationAtticVented
+        insulation_assembly_r_value = (1.0 / ceiling_ufactor).round(3)
       end
 
       new_hpxml.floors.add(id: orig_floor.id,