CEMCO’s Double “V” (#15) Control joint relieves stresses and strains in large plaster walls and ceilings. This inconspicuous product provides a clean and neat joint in exterior applications. This product has expanded flanges for proper keying and easy application. CEMCO’s Double “V” Control Joint is manufactured from 26 ga. , G60 hot-dipped galvanized steel by Niles and distributed by CEMCO. G90 is also available upon special request.