A wall assembly for a gas turbine engine, comprising: a support shell ; and a multiple of liner panels mounted to the support shell , at least one of the multiple of liner panels comprising: a perimeter rail that defines a first height from a cold side ; and an intermediate rail that defines a second height from the cold side , wherein the second height is less than the first height and thereby forms a reduced height intermediate rail, the wall assembly further comprises a multiple of studs that extend from the liner panel through the support shell ; wherein the multiple of studs extend from the intermediate rail , wherein the perimeter rail includes a forward circumferential rail , an aft circumferential rail axially spaced from the forward circumferential rail and a first and second axial end rail between the forward circumferential rail and the aft circumferential rail , wherein the intermediate rail is generally parallel to the forward circumferential rail and the aft circumferential rail characterized in that ; said reduced height intermediate rail forms a pre-assembly gap causing the liner panels and the respective support shell to deflect towards each other as fasteners are tightened onto the studs to produce a tight seal between the perimeter rail and the support shell . a support shell ; and a multiple of liner panels mounted to the support shell , at least one of the multiple of liner panels comprising: a perimeter rail that defines a first height from a cold side ; and an intermediate rail that defines a second height from the cold side , wherein the second height is less than the first height and thereby forms a reduced height intermediate rail, the wall assembly further comprises a multiple of studs that extend from the liner panel through the support shell ; wherein the multiple of studs extend from the intermediate rail , wherein the perimeter rail includes a forward circumferential rail , an aft circumferential rail axially spaced from the forward circumferential rail and a first and second axial end rail between the forward circumferential rail and the aft circumferential rail , wherein the intermediate rail is generally parallel to the forward circumferential rail and the aft circumferential rail characterized in that ; said reduced height intermediate rail forms a pre-assembly gap causing the liner panels and the respective support shell to deflect towards each other as fasteners are tightened onto the studs to produce a tight seal between the perimeter rail and the support shell . a perimeter rail that defines a first height from a cold side ; and an intermediate rail that defines a second height from the cold side , wherein the second height is less than the first height and thereby forms a reduced height intermediate rail, the wall assembly further comprises a multiple of studs that extend from the liner panel through the support shell ; wherein the multiple of studs extend from the intermediate rail , wherein the perimeter rail includes a forward circumferential rail , an aft circumferential rail axially spaced from the forward circumferential rail and a first and second axial end rail between the forward circumferential rail and the aft circumferential rail , wherein the intermediate rail is generally parallel to the forward circumferential rail and the aft circumferential rail characterized in that ; said reduced height intermediate rail forms a pre-assembly gap causing the liner panels and the respective support shell to deflect towards each other as fasteners are tightened onto the studs to produce a tight seal between the perimeter rail and the support shell . <EOS>