14 sq ft stucco - exterior plaster. Installation of these materials shall be in compliance with astmc926 and astmc1063 and the provisions of this code. R703. 6. 1 lath. All lath and lath attachments shall be of corrosion- resistant materials. Expanded metal or woven wire lath shall be attached with 1-1 2-inch-long (38 mm), 11 gage nails having a 7 16-inch (11. 1 mm) head, or 7 8-inch-long (22. 2 mm), 16 gage staples, spaced at no more than 6 inches (152 mm), or as otherwise approved. Contact inspector at district office for wall inspection prior to starting work. Work to be performed as per philadelphia historical commissions guidelines and approved plan.