diff --git a/backend/documents_parser/tests/test_summary_pdf_mapper_chain.py b/backend/documents_parser/tests/test_summary_pdf_mapper_chain.py
index 88ab7f14..b1966d40 100644
--- a/backend/documents_parser/tests/test_summary_pdf_mapper_chain.py
+++ b/backend/documents_parser/tests/test_summary_pdf_mapper_chain.py
@@ -42,6 +42,7 @@ from datatypes.epc.domain.mapper import (
     EpcPropertyDataMapper,
     UnmappedApiCode,
     UnmappedElmhurstLabel,
+    _elmhurst_glazing_type_code,  # pyright: ignore[reportPrivateUsage]
 )
 from domain.sap10_calculator.calculator import calculate_sap_from_inputs
 from domain.sap10_calculator.rdsap.cert_to_inputs import SAP_10_2_SPEC_PRICES, cert_to_inputs
@@ -1471,6 +1472,36 @@ def test_summary_000474_double_glazed_windows_route_to_code_3() -> None:
         )
 
 
+def test_elmhurst_glazing_label_full_coverage_per_sap10_table_6b() -> None:
+    # Arrange — the double_glazing recommendation fixture (Summary_001431)
+    # exercises every RdSAP-21 §11 glazing-type lodging in one cert. Each
+    # label must resolve to the SAP 10.2 Table 6b cascade code whose
+    # `_G_LIGHT_BY_GLAZING_CODE` daylight factor g_L is correct for the
+    # glazing family: single 0.90, double / secondary 0.80, triple 0.70
+    # (the lodged manufacturer U/g drive §3/§6; the code only sets g_L).
+    expected: dict[str, int] = {
+        "Single glazing": 1,
+        "Single glazing, known data": 15,
+        "Double pre 2002": 2,
+        "Double between 2002 and 2021": 3,
+        "Double with unknown install date": 3,
+        "Double glazing, known data": 3,
+        "Double post or during 2022": 5,
+        "Secondary glazing": 7,
+        "Secondary glazing - Normal emissivity": 11,
+        "Triple pre 2002": 10,
+        "Triple between 2002 and 2021": 9,
+        "Triple post or during 2022": 6,
+        "Triple with unknown install date": 6,
+    }
+
+    # Act / Assert
+    for label, code in expected.items():
+        assert _elmhurst_glazing_type_code(label) == code, (
+            f"{label!r} should map to SAP 10.2 Table 6b code {code}"
+        )
+
+
 def test_summary_mapper_raises_on_unmapped_glazing_type_label() -> None:
     # Arrange — same strict-coverage gate as the cylinder-size helper
     # (Slice S0380.15 + S0380.16): silently routing an unknown glazing
diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index 9bc5e8e3..71df85c0 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -5073,6 +5073,30 @@ _ELMHURST_GLAZING_LABEL_TO_SAP10: Dict[str, int] = {
     # solar_transmittance=0.72 overrides per worksheet-pinned value.
     "Triple between 2002 and 2021": 9,
     "Secondary": 7,
+    # Elmhurst §11 lodges the full "Secondary glazing" phrase as well as
+    # the bare "Secondary" form — both are SAP 10.2 Table 6b "window with
+    # secondary glazing" (cascade code 7, g_L=0.80, g⊥=0.76). The
+    # RdSAP-21 schema splits secondary glazing by pane emissivity; the
+    # "Normal emissivity" variant is its own code 11 (g_L=0.80, identical
+    # cascade output to 7, kept distinct for the strict-raise audit
+    # trail). Surfaced on the double_glazing/before recommendation
+    # fixture (Summary_001431 §11 Window 9).
+    "Secondary glazing": 7,
+    "Secondary glazing - Normal emissivity": 11,
+    # RdSAP-21 row "triple glazing, installed pre-2002" (cascade code 10,
+    # g_L=0.70, g⊥=0.68 — same triple-glazed daylight/solar bucket as the
+    # other triple variants {6, 8, 9, 14}). The lodged manufacturer
+    # U-value / solar_transmittance drive §6; the code only sets g_L.
+    "Triple pre 2002": 10,
+    # Triple glazing of unknown install date → the generic SAP 10.2
+    # Table 6b "triple glazed" row (cascade code 6, g_L=0.70). No
+    # dedicated "triple, unknown date" enum exists; 6 is the correct
+    # triple-glazed bucket.
+    "Triple with unknown install date": 6,
+    # RdSAP-21 row "single glazing, known data" (cascade code 15,
+    # g_L=0.90, g⊥=0.85 — same as plain single glazing). Manufacturer
+    # U/g lodged on WindowTransmissionDetails drive §6.
+    "Single glazing, known data": 15,
 }
 
 _ELMHURST_GLAZING_LABEL_NOISE_PREFIX_RE: Final[re.Pattern[str]] = re.compile(