DEAR BARRY: We purchased a condo last year and had it professionally inspected. The inspector could not see the gas line for the patio barbecue because it was under the concrete slab. But the seller assured us that it was installed to code. He volunteered this information while taking us on a tour of the home. Recently, we removed the patio to replace it with brick pavers. It turned out the gas line was on top of the soil, directly under the concrete. The paving company won’t install the new patio until we have the gas pipe buried at the required depth of 18 inches.