We wrapped the entire chimney chase with Weather Guard Ice and water shield and then installed Mortairvent rain screen to create a ventilated wall system.  We installed expanded metal lathe over the Mortairvent rain screen and scratch coated the chimney chase with mortar to prepared the surface for the installation of manufactured stone.  We installed Eldorado Shadow Rock onto the chimney chase and capped off the chimney chase with a limestone drip edge and a 304 stainless steel alloy top sheet.