diff --git a/B08_Quantity/B08_Quantity_Engine_UnitQuantity.py b/B08_Quantity/B08_Quantity_Engine_UnitQuantity.py
index d52dad12..ab920281 100644
--- a/B08_Quantity/B08_Quantity_Engine_UnitQuantity.py
+++ b/B08_Quantity/B08_Quantity_Engine_UnitQuantity.py
@@ -906,6 +906,25 @@ def verify_no_mix_components(quantities: Iterable[StructureQuantity]) -> list[st
     return found
 
 
+def section_modes_from_designs(designs: Iterable[dict[str, Any]]) -> dict[float, str]:
+    """저장된 횡단 설계 목록 → `{측점: 단면유형}`.
+
+    ⚠ **부르는 쪽마다 다시 짜지 말라고 여기 둔다.** 구조물 전개(B08)와 표준도(B07)가
+      같은 표를 써야 기울기 판정이 두 곳에서 갈리지 않는다.
+      `design.section_mode` 가 없는 측점은 담지 않는다 — 빈 값을 담으면 「가를 근거 없음」과
+      「모드가 빈 문자열」이 뒤섞인다.
+    """
+    modes: dict[float, str] = {}
+    for item in designs or ():
+        design = item.get("design") if isinstance(item, dict) else None
+        mode = str((design or {}).get("section_mode") or "").strip()
+        if not mode:
+            continue
+        chainage = _num(item.get("chainage_m"))
+        modes[float(chainage)] = mode
+    return modes
+
+
 def _section_mode_at(
     structure: dict[str, Any], section_modes: dict[float, str] | None
 ) -> str | None:
diff --git a/B08_Quantity/B08_Quantity_Router_Material.py b/B08_Quantity/B08_Quantity_Router_Material.py
index 659cb2fd..9a3058f1 100644
--- a/B08_Quantity/B08_Quantity_Router_Material.py
+++ b/B08_Quantity/B08_Quantity_Router_Material.py
@@ -32,6 +32,7 @@ from B05_Profile.B05_Profile_Structures_Schema import structure_type_map
 from B08_Quantity.B08_Quantity_Engine_Handoff import build_handoff, load_mapping, summarize
 from B08_Quantity.B08_Quantity_Engine_MaterialSummary import build_table as build_material_table
 from B08_Quantity.B08_Quantity_Engine_UnitQuantity import build_table as build_unit_table
+from B08_Quantity.B08_Quantity_Engine_UnitQuantity import section_modes_from_designs
 from common_util.common_util_project_settings import (
     concrete_placing_method,
     quantity_settings,
@@ -95,11 +96,7 @@ async def _section_modes(project_id: UUID) -> dict[float, str]:
     except Exception:
         logger.exception("B08 단면유형 조회 실패: project_id=%s", project_id)
         return {}
-    return {
-        float(item["chainage_m"]): str((item.get("design") or {}).get("section_mode") or "")
-        for item in designs
-        if (item.get("design") or {}).get("section_mode")
-    }
+    return section_modes_from_designs(designs)
 
 
 @router.get("/{project_id}/quantity/material-summary")