diff --git a/datatypes/epc/domain/tests/test_from_rdsap_schema.py b/datatypes/epc/domain/tests/test_from_rdsap_schema.py
index 3c64edc2..8e88bb77 100644
--- a/datatypes/epc/domain/tests/test_from_rdsap_schema.py
+++ b/datatypes/epc/domain/tests/test_from_rdsap_schema.py
@@ -1525,3 +1525,31 @@ class TestRdSap18_0ReducedFieldSynthesis:
         assert sorted(w.orientation for w in result.sap_windows) == [1, 3, 5, 7]
         total_area = sum(w.window_width * w.window_height for w in result.sap_windows)
         assert total_area == pytest.approx(0.148 * tfa)
+
+    def test_band_more_than_typical_scales_glazing_by_1_25(self) -> None:
+        # Arrange — ADR-0028: the glazed_area band scales synthesised area off the
+        # Normal ratio. Band 2 ("More than typical") = 1.25, the inherited 20.0.0
+        # multiplier (18.0's 26 band-2 windowless certs can't re-fit it — no
+        # measured band-2 windows — so it is reused, not re-derived). A band-2
+        # cert with no per-window array.
+        corpus = _load_18_0_corpus()
+        if not corpus:
+            pytest.skip("no RdSAP-Schema-18.0 corpus harvested")
+        cert = next(
+            (
+                c
+                for c in corpus
+                if not c.get("sap_windows") and c.get("glazed_area") == 2
+            ),
+            None,
+        )
+        if cert is None:
+            pytest.skip("no band-2 corpus cert without sap_windows")
+        tfa = float(cert["total_floor_area"])
+
+        # Act
+        result = EpcPropertyDataMapper.from_api_response(cert)
+
+        # Assert
+        total_area = sum(w.window_width * w.window_height for w in result.sap_windows)
+        assert total_area == pytest.approx(0.148 * tfa * 1.25)