diff --git a/src/components/survey-sale/detail/RoofForm.tsx b/src/components/survey-sale/detail/RoofForm.tsx
index 37b84eb..353de95 100644
--- a/src/components/survey-sale/detail/RoofForm.tsx
+++ b/src/components/survey-sale/detail/RoofForm.tsx
@@ -530,7 +530,7 @@ const MultiCheck = ({
 
   /** 다중 선택 처리 */
   const handleCheckbox = (item: { id: number; code: string | null; name: string }) => {
-    const isOtherSelected = Boolean(etcValue)
+    const isOtherSelected = etcValue !== null
     let newValue: string[]
 
     if (selectedValues.includes(item.code ?? String(item.id))) {
@@ -556,7 +556,7 @@ const MultiCheck = ({
 
     if (isRoofMaterial) {
       /** 지붕 재료 기타 선택 포함 최대 2개 선택 처리 */
-      if (selectedValues.length >= 2) {
+      if (!isOtherSelected && selectedValues.length >= 2) {
         showErrorAlert(WARNING_MESSAGE.ROOF_MATERIAL_MAX_SELECT)
         setEtcValue(null)
         return