diff --git a/src/blenderbim/blenderbim/bim/module/model/prop.py b/src/blenderbim/blenderbim/bim/module/model/prop.py
index b3828602d5..9504ae948a 100644
--- a/src/blenderbim/blenderbim/bim/module/model/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/model/prop.py
@@ -564,7 +564,15 @@ class BIMRailingProperties(PropertyGroup):
 
 
 class BIMRoofProperties(PropertyGroup):
-    non_si_units_props = ("is_editing", "path_data", "roof_type", "roof_added_previously", "generation_method", "angle", "rafter_edge_angle")
+    non_si_units_props = (
+        "is_editing",
+        "path_data",
+        "roof_type",
+        "roof_added_previously",
+        "generation_method",
+        "angle",
+        "rafter_edge_angle",
+    )
     roof_types = (("HIP/GABLE ROOF", "HIP/GABLE ROOF", ""),)
     roof_generation_methods = (
         ("HEIGHT", "HEIGHT", ""),
@@ -584,7 +592,7 @@ class BIMRoofProperties(PropertyGroup):
     )
     angle: bpy.props.FloatProperty(name="Slope Angle", default=pi / 18, subtype="ANGLE")
     roof_thickness: bpy.props.FloatProperty(name="Roof Thickness", default=0.1, subtype="DISTANCE")
-    rafter_edge_angle: bpy.props.FloatProperty(name="Rafter Edge Angle", min=0, max = pi, default=pi / 2, subtype="ANGLE")
+    rafter_edge_angle: bpy.props.FloatProperty(name="Rafter Edge Angle", min=0, max=pi, default=pi / 2, subtype="ANGLE")
 
     def get_general_kwargs(self, convert_to_project_units=False):
         kwargs = {
diff --git a/src/blenderbim/blenderbim/bim/module/model/roof.py b/src/blenderbim/blenderbim/bim/module/model/roof.py
index ef43ce3902..dcede5adf6 100644
--- a/src/blenderbim/blenderbim/bim/module/model/roof.py
+++ b/src/blenderbim/blenderbim/bim/module/model/roof.py
@@ -108,7 +108,9 @@ def is_valid_roof_footprint(bm):
     return ({"FINISHED"}, "")
 
 
-def generate_hiped_roof_bmesh(bm, mode="ANGLE", height=1.0, roof_thickness = 0.1, angle=pi / 18, rafter_edge_angle = pi / 2, mutate_current_bmesh=True):
+def generate_hiped_roof_bmesh(
+    bm, mode="ANGLE", height=1.0, roof_thickness=0.1, angle=pi / 18, rafter_edge_angle=pi / 2, mutate_current_bmesh=True
+):
     """return bmesh with gable roof geometry
 
     `mutate_current_bmesh` is a flag to indicate whether the input bmesh
@@ -230,7 +232,7 @@ def generate_hiped_roof_bmesh(bm, mode="ANGLE", height=1.0, roof_thickness = 0.1
     verts_to_change = {}
     verts_to_rip = []
     bottom_chords_to_remove = []
-    
+
     def is_footprint_vert(v):
         return float_is_zero(v.co.z - footprint_z)
 
@@ -320,7 +322,7 @@ def generate_hiped_roof_bmesh(bm, mode="ANGLE", height=1.0, roof_thickness = 0.1
     extrusion_geom = bm_sort_out_geom(bmesh.ops.extrude_face_region(bm, geom=bm.faces)["geom"])
     extruded_edges = extrusion_geom["edges"]
     extruded_verts = extrusion_geom["verts"]
-    rafter_edge_angle = pi/2 - rafter_edge_angle
+    rafter_edge_angle = pi / 2 - rafter_edge_angle
     default_offset_dir = Vector([0, 0, 1]) * roof_thickness
     footprint_verts = set()
 
@@ -340,14 +342,14 @@ def generate_hiped_roof_bmesh(bm, mode="ANGLE", height=1.0, roof_thickness = 0.1
 
             if len(non_footprint_verts) == 1:
                 return non_footprint_verts[0]
-            
-            return min(non_footprint_verts, key=lambda v1: (v1.co-v.co).length)
+
+            return min(non_footprint_verts, key=lambda v1: (v1.co - v.co).length)
 
         top_verts = dict()
         for v in footprint_verts:
             top_verts[v] = get_top_vert(v)
 
-        # TODO: rafter_edge_angle might differ 
+        # TODO: rafter_edge_angle might differ
         # if footprint edges are not connected by 90 degrees
         verts_offsets = dict()
         for edge in footprint_edges:
@@ -371,7 +373,6 @@ def generate_hiped_roof_bmesh(bm, mode="ANGLE", height=1.0, roof_thickness = 0.1
             # for different rafter edge angles
             v.co = mathutils.geometry.intersect_line_line(bot, top, base, offsetted)[0]
 
-
     verts = [v for v in extruded_verts if v not in footprint_verts]
     bmesh.ops.translate(bm, vec=default_offset_dir, verts=verts)
     bmesh.ops.recalc_face_normals(bm, faces=bm.faces[:])
@@ -454,8 +455,14 @@ def update_roof_modifier_bmesh(context):
         return
 
     generate_hiped_roof_bmesh(
-        bm, props.generation_method, props.height, props.roof_thickness, 
-        props.angle, props.rafter_edge_angle, mutate_current_bmesh=True)
+        bm,
+        props.generation_method,
+        props.height,
+        props.roof_thickness,
+        props.angle,
+        props.rafter_edge_angle,
+        mutate_current_bmesh=True,
+    )
     tool.Blender.apply_bmesh(obj.data, bm)
 
 
@@ -675,8 +682,13 @@ class EnableEditingRoofPath(bpy.types.Operator, tool.Ifc.Operator):
             main_bm.edges.layers.int.new("BBIM_preview")
 
             second_bm = generate_hiped_roof_bmesh(
-                bm,props.generation_method, props.height, props.roof_thickness, 
-                props.angle, props.rafter_edge_angle, mutate_current_bmesh=False
+                bm,
+                props.generation_method,
+                props.height,
+                props.roof_thickness,
+                props.angle,
+                props.rafter_edge_angle,
+                mutate_current_bmesh=False,
             )
             bmesh.ops.translate(second_bm, verts=second_bm.verts, vec=Vector((0, 0, 1)))