diff --git a/recommendations/RoofRecommendations.py b/recommendations/RoofRecommendations.py
index 578173bb..08fceb32 100644
--- a/recommendations/RoofRecommendations.py
+++ b/recommendations/RoofRecommendations.py
@@ -424,14 +424,17 @@ class RoofRecommendations:
             is_assumed = mapped["is_assumed"]
             insulation_thickness = mapped["insulation_thickness"]
             is_at_rafters = mapped["is_at_rafters"]
+            is_flat = mapped["is_flat"]
 
             needs_sloping_ceiling = self.is_sloping_ceiling_appropriate(
+                is_flat=is_flat,
                 is_pitched=is_pitched,
                 is_loft=is_loft,
                 is_assumed=is_assumed,
                 has_sloping_ceiling_recommendation=has_sloping_ceiling_recommendation,
                 primary_roof_is_sloped=True,
-                insulation_thickness=insulation_thickness
+                insulation_thickness=insulation_thickness,
+                has_loft_insulation_recommendation=has_loft_insulation_recommendation
             )
             # If the roof has some form of insulation already but isn't a loft, it's
             # not a loft. E.g. "pitched, limited insulation" is for sloping ceiling, not loft
@@ -525,11 +528,13 @@ class RoofRecommendations:
 
         needs_sloping_ceiling = self.is_sloping_ceiling_appropriate(
             is_pitched=is_pitched,
+            is_flat=is_flat,
             is_loft=is_loft,
             is_assumed=is_assumed,
             has_sloping_ceiling_recommendation=has_sloping_ceiling_recommendation,
             primary_roof_is_sloped=primary_roof_is_sloped,
-            insulation_thickness=insulation_thickness
+            insulation_thickness=insulation_thickness,
+            has_loft_insulation_recommendation=has_loft_insulation_recommendation
         )
         needs_loft_insulation = self.is_loft_insulation_appropriate(
             measures=measures,
diff --git a/recommendations/tests/test_roof_recommendations.py b/recommendations/tests/test_roof_recommendations.py
index f022f9b7..9f39779c 100644
--- a/recommendations/tests/test_roof_recommendations.py
+++ b/recommendations/tests/test_roof_recommendations.py
@@ -407,7 +407,8 @@ class TestRoofRecommendations:
 
     # ~~~~~~~~~~~~ Sloping Ceiling Insulation ~~~~~~~~~~~~
     @pytest.mark.parametrize(
-        "roof, has_sloping_ceiling_recommendation, primary_roof_is_sloped, insulation_thickness, expected_result",
+        "roof, has_sloping_ceiling_recommendation, primary_roof_is_sloped, insulation_thickness, "
+        "has_loft_insulation_recommendation, expected_result",
         [
             (
                 {
@@ -428,6 +429,7 @@ class TestRoofRecommendations:
                 True,
                 True,
                 "none",
+                False,
                 True,
             ),
             (
@@ -441,21 +443,24 @@ class TestRoofRecommendations:
                 False,
                 False,
                 "average",
+                False,
                 False
             )
         ]
     )
     def test_is_sloping_ceiling_appropriate(
         self, roof, has_sloping_ceiling_recommendation, primary_roof_is_sloped,
-        insulation_thickness, expected_result
+        insulation_thickness, has_loft_insulation_recommendation, expected_result
     ):
         assert RoofRecommendations.is_sloping_ceiling_appropriate(
+            is_flat=roof["is_flat"],
             is_pitched=roof["is_pitched"],
             is_loft=roof["is_loft"],
             is_assumed=roof["is_assumed"],
             has_sloping_ceiling_recommendation=has_sloping_ceiling_recommendation,
             primary_roof_is_sloped=primary_roof_is_sloped,
-            insulation_thickness=insulation_thickness
+            insulation_thickness=insulation_thickness,
+            has_loft_insulation_recommendation=has_loft_insulation_recommendation
         ) == expected_result
 
     def test_sloping_ceiling_pitched_no_insulation(self):