lib/openstudio-standards/btap/envelope.rb in openstudio-standards-0.2.14 vs lib/openstudio-standards/btap/envelope.rb in openstudio-standards-0.2.15.pre.rc1

@@ -832,12 +832,12 @@
           construction = OpenStudio::Model::getConstructionByName(model, construction.name.to_s).get
           tvis = 1.0
           if construction.isFenestration
             construction.layers.each do |layer|
               #check to see if it is a simple glazing. If so use the SHGC method.
-              tvis = tvis * layer.to_SimpleGlazing.get.visibleTransmittance.get unless layer.to_SimpleGlazing.empty?
+              tvis = tvis * layer.to_SimpleGlazing.get.visibleTransmittance.get unless layer.to_SimpleGlazing.empty? || layer.to_SimpleGlazing.get.visibleTransmittance.empty?
               #check to see if it is a standard glazing. If so use the solar transmittance method.
-              tvis = tvis * layer.to_StandardGlazing.get.visibleTransmittanceatNormalIncidence.get unless layer.to_StandardGlazing.empty?
+              tvis = tvis * layer.to_StandardGlazing.get.visibleTransmittanceatNormalIncidence.get unless layer.to_StandardGlazing.empty? || layer.to_StandardGlazing.get.visibleTransmittanceatNormalIncidence.empty?
             end
           end
           return tvis
         end
 
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