TIMco Oval Metal Insulation Stress Plate Silver - 82 x 40 Frequently used with long screws to attach insulation material to timber. Oval type for use in softer materials, accommodates countersunk screws and recesses itself into insulation for a flush finish. ?NOTE: Once installed, the head of the fixing should be taped and sealed to avoid any contact with wet plaster. Failure to do so may result in surface damage.