diff --git a/recommendations/RoofRecommendations.py b/recommendations/RoofRecommendations.py
index a1f8c67c..615289de 100644
--- a/recommendations/RoofRecommendations.py
+++ b/recommendations/RoofRecommendations.py
@@ -87,6 +87,17 @@ class RoofRecommendations:
 
         return (self.insulation_thickness > self.MINIMUM_LOFT_ISULATION_MM) and self.property.roof["is_pitched"]
 
+    def is_room_roof_insulated(self):
+
+        """
+        Check if the room roof is already insulated
+        """
+
+        return (
+            self.property.roof["is_roof_room"] and
+            self.property.roof["insulation_thickness"] in ["average", "above_average"]
+        )
+
     def recommend(self, phase):
 
         if self.property.roof["has_dwelling_above"]:
@@ -105,8 +116,8 @@ class RoofRecommendations:
         if (self.insulation_thickness >= self.MINIMUM_FLAT_ROOF_ISULATION_MM) and self.property.roof["is_flat"]:
             return
 
-        if self.property.roof["is_roof_room"]:
-            raise ValueError("Update convert_thickness_to_numeric for room roof and implement")
+        if self.is_room_roof_insulated():
+            return
 
         # If we have a u-value already, need to implement this
         if u_value:
@@ -118,7 +129,17 @@ class RoofRecommendations:
                 return
             raise NotImplementedError("Implement me")
 
-        u_value = get_roof_u_value(**{**self.property.roof, "age_band": self.property.age_band})
+        u_value = get_roof_u_value(
+            insulation_thickness=self.property.roof["insulation_thickness"],
+            has_dwelling_above=self.property.roof["has_dwelling_above"],
+            is_loft=self.property.roof["is_loft"],
+            is_roof_room=self.property.roof["is_roof_room"],
+            is_thatched=self.property.roof["is_thatched"],
+            age_band=self.property.age_band,
+            is_flat=self.property.roof["is_flat"],
+            is_pitched=self.property.roof["is_pitched"],
+            is_at_rafters=self.property.roof["is_at_rafters"],
+        )
 
         self.estimated_u_value = u_value
         if (u_value <= self.BUILDING_REGULATIONS_PART_L_MAX_U_VALUE) and (
diff --git a/recommendations/recommendation_utils.py b/recommendations/recommendation_utils.py
index 9b5e22d1..4980f30a 100644
--- a/recommendations/recommendation_utils.py
+++ b/recommendations/recommendation_utils.py
@@ -207,6 +207,17 @@ def get_wall_u_value(
 
 def get_u_value_from_s9(thickness, s9, is_loft, is_roof_room, is_thatched):
     """Get the U-value from table S9 based on the insulation thickness."""
+
+    if is_roof_room:
+        # We re-map the thickness
+        thickness_map = {
+            "below average": 50,
+            "average": 100,
+            "above average": 270,
+            "none": 0,
+        }
+        thickness = thickness_map[thickness]
+
     if thickness in ["below average", "average", "above average", "none", None] or (
         not is_loft and not is_roof_room
     ):
@@ -676,7 +687,7 @@ def estimate_windows(
     property_type, built_form, construction_age_band, floor_area, number_habitable_rooms
 ):
     # If there is an extension, that will boost the number of habitable rooms
-    
+
     # Base window count based on habitable rooms
     window_count = number_habitable_rooms