diff --git a/structuralcodes/core/_section_results.py b/structuralcodes/core/_section_results.py
index f0cc3e5f..aaa1b6d9 100644
--- a/structuralcodes/core/_section_results.py
+++ b/structuralcodes/core/_section_results.py
@@ -12,9 +12,6 @@ class GrossProperties:
 
     # section areas
     area: float = field(default=0, metadata={'description': 'Total area'})
-    area_surface: float = field(
-        default=0, metadata={'description': 'Surface area'}
-    )
     area_reinforcement: float = field(
         default=0, metadata={'description': 'Reinforcement area'}
     )
diff --git a/structuralcodes/sections/_generic.py b/structuralcodes/sections/_generic.py
index e6a1e6a3..60d72f29 100644
--- a/structuralcodes/sections/_generic.py
+++ b/structuralcodes/sections/_generic.py
@@ -136,7 +136,6 @@ def _calculate_gross_section_properties(self) -> s_res.GrossProperties:
         # and mass: Morten -> problem with units! how do we deal with it?
         for geo in self.section.geometry.geometries:
             gp.ea += geo.area * geo.material.get_tangent(eps=0)[0]
-            gp.area_surface += geo.area
             if geo.density is not None:
                 # this assumes area in mm2 and density in kg/m3
                 gp.mass += geo.area * geo.density * 1e-9