>best way to water proof the ceiling of ground floor space?
So I am building a covered porch for a second story apartment, in the process I am building a retaining wall that will essentially give a usable room to the downstairs storefront. However how would I go about making the downstairs space water proof on the ceiling without enclosing the porch on the second floor?
So I am building a covered porch for a second story apartment, in the process I am building a retaining wall that will essentially give a usable room to the downstairs storefront. However how would I go about making the downstairs space water proof on the ceiling without enclosing the porch on the second floor?