WHAT IS COOPER STONES RECOMMENDATION REGARDING FLASHING AROUND WINDOWS AND DOORS?
To maintain the weather-resistance of the exterior wall on which the stone products are installed, a rigid, corrosion-resistant flashing (and a means of drainage) should be installed at all penetrations and terminations of the stone veneer cladding. Flashing types and locations should be in accordance with the requirements of the local building codes. Also refer to ASTM E2112.