diff --git a/src/blenderbim/blenderbim/bim/module/model/wall.py b/src/blenderbim/blenderbim/bim/module/model/wall.py
index 72a2c33c45..d41f8d5e11 100644
--- a/src/blenderbim/blenderbim/bim/module/model/wall.py
+++ b/src/blenderbim/blenderbim/bim/module/model/wall.py
@@ -866,25 +866,24 @@ def calculate_quantities(usecase_path, ifc_file, settings):
     width = obj.dimensions[1] / unit_scale
     height = obj.dimensions[2] / unit_scale
 
-    if product.HasOpenings:
-        # TODO: calculate gross / net
-        gross_footprint_area = 0
-        net_footprint_area = 0
-        gross_side_area = 0
-        net_side_area = 0
-        gross_volume = 0
-        net_volume = 0
-    else:
-        bm = bmesh.new()
-        bm.from_mesh(obj.data)
-        bm.faces.ensure_lookup_table()
-        gross_footprint_area = sum([f.calc_area() for f in bm.faces if f.normal.z < -0.9])
-        net_footprint_area = gross_footprint_area
-        gross_side_area = sum([f.calc_area() for f in bm.faces if f.normal.y > 0.9])
-        net_side_area = gross_side_area
-        gross_volume = bm.calc_volume()
-        net_volume = gross_volume
-        bm.free()
+    bm_gross = bmesh.new()
+    bm_gross.from_mesh(obj.data)
+    bm_gross.faces.ensure_lookup_table()
+
+    bm_net = bmesh.new()
+    depsgraph = bpy.context.evaluated_depsgraph_get()
+    evaluated_mesh = obj.evaluated_get(depsgraph).data
+    bm_net.from_mesh(evaluated_mesh)
+    bm_net.faces.ensure_lookup_table()
+
+    gross_footprint_area = sum([f.calc_area() for f in bm_gross.faces if f.normal.z < -0.9])
+    net_footprint_area = sum([f.calc_area() for f in bm_net.faces if f.normal.z < -0.9])
+    gross_side_area = sum([f.calc_area() for f in bm_gross.faces if f.normal.y > 0.9])
+    net_side_area = sum([f.calc_area() for f in bm_net.faces if f.normal.y > 0.9])
+    gross_volume = bm_gross.calc_volume()
+    net_volume = bm_net.calc_volume()
+    bm_gross.free()
+    bm_net.free()
 
     ifcopenshell.api.run(
         "pset.edit_qto",