diff --git a/etl/epc_clean/epc_attributes/RoofAttributes.py b/etl/epc_clean/epc_attributes/RoofAttributes.py
index 154fe41b..a67a6029 100644
--- a/etl/epc_clean/epc_attributes/RoofAttributes.py
+++ b/etl/epc_clean/epc_attributes/RoofAttributes.py
@@ -16,6 +16,7 @@ class RoofAttributes(Definitions):
         "ar oleddf, inswleiddio cyfyngedig (rhagdybiaeth)": "pitched, limited insulation (assumed)",
         "ar oleddf, inswleiddio cyfyngedig": "pitched, limited insulation",
         "ar oleddf, wedigçöi inswleiddio wrth y trawstiau": 'pitched, insulated at rafters',
+        "ar oleddf, wedi?i inswleiddio wrth y trawstiau": 'pitched, insulated at rafters',
         "yn wastad, inswleiddio cyfyngedig (rhagdybiaeth)": "flat, limited insulation (assumed)",
         "yn wastad, inswleiddio cyfyngedig": "flat, limited insulation",
         "yn wastad, dim inswleiddio (rhagdybiaeth)": "flat, no insulation (assumed)",