Pipe details with dimension and process including refrigerant pipe , mastic sealant all around, cast in pipe sleeve , RC roof slab , standard size of roof pipe maximum is 300mm, also mentioned galvanized steel flashing bedded in mastic and secure with galvanized steel camping
ring PVC conduits are also used in cases when electric wire may need to run below the ground or in an open environment that is exposed to air, dust and water for more details of Pipe details with dimension and process download this file.