diff --git a/B06_Section/B06_Section_UI_Page.ts b/B06_Section/B06_Section_UI_Page.ts
index 900c0e7d..d21dccf7 100644
--- a/B06_Section/B06_Section_UI_Page.ts
+++ b/B06_Section/B06_Section_UI_Page.ts
@@ -62,6 +62,7 @@ import {
   wallSpecsFrom,
   type WallStructureInput,
 } from "@util/common_util_structure_walls";
+import { applyStructureAreaRows, structureAreaRows } from "./B06_Section_Structure_Layouts";
 import {
   fetchStructureTypes,
   readPendingStructures,
@@ -361,6 +362,15 @@ export async function renderB06ProfileCross(root: HTMLElement): Promise<void> {
     if (!projectId || currentRouteId === null) return;
     try {
       await applyDraftWalls(sectionDetail);
+      // 면적을 **먼저** 다시 얹는다 — 유토곡선은 카드보다 앞서 계산되므로, 카드 렌더가
+      // 고치는 것만으로는 곡선이 옛 면적으로 남는다(2026-09-06 실측: 카드는 바뀌는데
+      // 최종 누가토량이 그대로였음).
+      if (sectionDetail) {
+        applyStructureAreaRows(
+          sectionDetail.cross_sections,
+          structureAreaRows(sectionDetail.cross_sections),
+        );
+      }
       renderSectionDetail();
     } catch (error) {
       const detail = error instanceof Error ? ` ${error.message}` : "";