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.