diff --git a/src/components/auth/Join.jsx b/src/components/auth/Join.jsx
index f414cd62..4062d313 100644
--- a/src/components/auth/Join.jsx
+++ b/src/components/auth/Join.jsx
@@ -98,6 +98,10 @@ export default function Join() {
       alert(getMessage('common.message.required.data', [getMessage('join.sub1.fax')]))
       faxRef.current.focus()
       return false
+    }else if (!telRegex.test(fax)) {
+      alert(getMessage('join.validation.check1', [getMessage('join.sub1.fax')]))
+      faxRef.current.focus()
+      return false
     }
 
     const bizNo = formData.get('bizNo')
@@ -174,6 +178,10 @@ export default function Join() {
       alert(getMessage('common.message.required.data', [getMessage('join.sub2.fax')]))
       userFaxRef.current.focus()
       return false
+    } else if (!telRegex.test(userFax)) {
+      alert(getMessage('join.validation.check1', [getMessage('join.sub2.fax')]))
+      userFaxRef.current.focus()
+      return false
     }
 
     return true
@@ -349,7 +357,15 @@ export default function Join() {
                       <th>{getMessage('join.sub1.fax')}<span className="important">*</span></th>
                       <td>
                         <div className="input-wrap" style={{ width: '200px' }}>
-                          <input type="text" id="fax" name="fax" className="input-light" maxLength={15} onChange={inputNumberCheck} ref={faxRef} />
+                          <input
+                            type="text"
+                            id="fax"
+                            name="fax"
+                            className="input-light"
+                            maxLength={15}
+                            placeholder={getMessage('join.sub1.telNo_placeholder')}
+                            onChange={inputTelNumberCheck}
+                            ref={faxRef} />
                         </div>
                       </td>
                     </tr>
@@ -466,7 +482,8 @@ export default function Join() {
                             name="userFax"
                             className="input-light"
                             maxLength={15}
-                            onChange={inputNumberCheck}
+                            placeholder={getMessage('join.sub1.telNo_placeholder')}
+                            onChange={inputTelNumberCheck}
                             ref={userFaxRef}
                           />
                         </div>
diff --git a/src/components/floor-plan/modal/circuitTrestle/CircuitTrestleSetting.jsx b/src/components/floor-plan/modal/circuitTrestle/CircuitTrestleSetting.jsx
index 4c4ea028..02e9d171 100644
--- a/src/components/floor-plan/modal/circuitTrestle/CircuitTrestleSetting.jsx
+++ b/src/components/floor-plan/modal/circuitTrestle/CircuitTrestleSetting.jsx
@@ -124,6 +124,9 @@ export default function CircuitTrestleSetting({ id }) {
      */
     const validateModuleSizeForRack = (surface) => {
       const { modules, direction, trestleDetail } = surface
+      if (!trestleDetail) {
+        return true // 상세 정보 없음
+      }
       const { rackYn, moduleIntvlHor, moduleIntvlVer } = trestleDetail
 
       if (rackYn === 'N' || !modules || modules.length < 2) {
diff --git a/src/hooks/module/useModule.js b/src/hooks/module/useModule.js
index 45b3b50f..8e59a1e7 100644
--- a/src/hooks/module/useModule.js
+++ b/src/hooks/module/useModule.js
@@ -749,7 +749,7 @@ export function useModule() {
     const copyModules = []
     const moduleSetupSurface = canvas.getObjects().find((obj) => obj.name === POLYGON_TYPE.MODULE_SETUP_SURFACE && obj.id === activeModule.surfaceId)
     let isWarning = false
-    const { moduleIntvlHor, moduleIntvlVer } = moduleSetupSurface.trestleDetail
+    const { moduleIntvlHor = 0, moduleIntvlVer = 0 } = moduleSetupSurface.trestleDetail || {}
     canvas.discardActiveObject()
     targetModules.forEach((module) => {
       const { top, left } = getPosotion(module, type, moduleIntvlHor, true)
@@ -859,7 +859,7 @@ export function useModule() {
     const copyModules = []
     const moduleSetupSurface = canvas.getObjects().find((obj) => obj.name === POLYGON_TYPE.MODULE_SETUP_SURFACE && obj.id === activeModule.surfaceId)
     let isWarning = false
-    const { moduleIntvlHor, moduleIntvlVer } = moduleSetupSurface.trestleDetail
+    const { moduleIntvlHor = 0, moduleIntvlVer = 0 } = moduleSetupSurface.trestleDetail || {}
     canvas.discardActiveObject()
     targetModules.forEach((module) => {
       const { top, left } = getPosotion(module, type, moduleIntvlVer, true)
diff --git a/src/hooks/module/useModuleBasicSetting.js b/src/hooks/module/useModuleBasicSetting.js
index ce7069ac..8d07b18f 100644
--- a/src/hooks/module/useModuleBasicSetting.js
+++ b/src/hooks/module/useModuleBasicSetting.js
@@ -338,10 +338,27 @@ export function useModuleBasicSetting(tabNum) {
       })
 
       let isNorth = false
+      const defaultTrestleDetail = {
+        rackYn: 'N',
+        moduleIntvlHor: +roofSizeSet === 3 ? 300 : 0,
+        moduleIntvlVer: +roofSizeSet === 3 ? 100 : 0,
+        rack: null,
+        rackQty: 0,
+        rackIntvlPct: 0,
+        cvrPlvrYn: 'N',
+        lessSupFitIntvlPct: 0,
+        lessSupFitQty: 0,
+      }
 
       const isExistSurface = canvas.getObjects().find((obj) => obj.name === POLYGON_TYPE.MODULE_SETUP_SURFACE && obj.parentId === roof.id)
+      const normalizedTrestleDetail = trestleDetail
+        ? { ...defaultTrestleDetail, ...trestleDetail }
+        : isExistSurface?.trestleDetail
+          ? { ...defaultTrestleDetail, ...isExistSurface.trestleDetail }
+          : defaultTrestleDetail
 
       if (isExistSurface) {
+        isExistSurface.set({ trestleDetail: normalizedTrestleDetail })
         if (canvasSetting.roofSizeSet != '3') {
           //북면이 있지만
           if (roof.directionText && roof.directionText.indexOf('北') > -1) {
@@ -424,7 +441,7 @@ export function useModuleBasicSetting(tabNum) {
           originY: 'center',
           modules: [],
           roofMaterial: roof.roofMaterial,
-          trestleDetail: trestleDetail,
+          trestleDetail: normalizedTrestleDetail,
           isNorth: isNorth,
           perPixelTargetFind: true,
           isSaleStoreNorthFlg: moduleSelectionData.common.saleStoreNorthFlg == '1' ? true : false, //북면설치가능점 여부
diff --git a/src/hooks/module/useTrestle.js b/src/hooks/module/useTrestle.js
index 88980cad..e4ee52a8 100644
--- a/src/hooks/module/useTrestle.js
+++ b/src/hooks/module/useTrestle.js
@@ -65,6 +65,10 @@ export const useTrestle = () => {
         if (+roofSizeSet === 3) {
           return
         }
+        const trestleDetail = surface.trestleDetail
+        if (!trestleDetail) {
+          return
+        }
         const construction = moduleSelectionData?.roofConstructions?.find((construction) => construction.roofIndex === roofMaterialIndex).construction
         if (!construction) {
           return
@@ -76,8 +80,8 @@ export const useTrestle = () => {
         let isSnowGuard = construction.setupSnowCover
         let cvrLmtRow = construction.cvrLmtRow
         const direction = parent.direction
-        const rack = surface.trestleDetail.rack
-        let { rackQty, rackIntvlPct, rackYn, cvrPlvrYn, lessSupFitIntvlPct, lessSupFitQty } = surface.trestleDetail
+        const rack = trestleDetail.rack
+        let { rackQty, rackIntvlPct, rackYn, cvrPlvrYn, lessSupFitIntvlPct, lessSupFitQty } = trestleDetail
 
         if (!rack && lessSupFitIntvlPct === 0 && lessSupFitQty === 0) {
           //25/02/06 가대없음의 경우 랙정보가 없음