diff --git a/src/app/db/schema/landlord_overrides.ts b/src/app/db/schema/landlord_overrides.ts
index c032339b..f8a5952f 100644
--- a/src/app/db/schema/landlord_overrides.ts
+++ b/src/app/db/schema/landlord_overrides.ts
@@ -89,6 +89,22 @@ export const RoofTypeValues: [string, ...string[]] = [
   "Flat, limited insulation (assumed)",
   "Flat, no insulation",
   "Flat, no insulation (assumed)",
+  "Flat, 12 mm insulation",
+  "Flat, 25 mm insulation",
+  "Flat, 50 mm insulation",
+  "Flat, 75 mm insulation",
+  "Flat, 100 mm insulation",
+  "Flat, 125 mm insulation",
+  "Flat, 150 mm insulation",
+  "Flat, 175 mm insulation",
+  "Flat, 200 mm insulation",
+  "Flat, 225 mm insulation",
+  "Flat, 250 mm insulation",
+  "Flat, 270 mm insulation",
+  "Flat, 300 mm insulation",
+  "Flat, 350 mm insulation",
+  "Flat, 400 mm insulation",
+  "Flat, 400+ mm insulation",
   "Pitched, insulated",
   "Pitched, insulated (assumed)",
   "Pitched, insulated at rafters",