Our circa 1941 garage was originally built with a thin veneer of flagstone over tin roof. Per the blueprints, the stone was cut thicker in the middle to encourage proper drainage. The previous owners removed the flagstone and covered the tin with wolmanized lumber in the mid-80's. With no attention to replacing the natural drainage with a proper system, we now have a garage that leaks like a sieve. We made the sellers remove the lumber as a condition of sale. The tin is rusted and the trusses are likely to be replaced. We'd like to put the stone back up, but have concerns that it may have been removed due to weight.
Are there any new simulated surfaces that we can use to replace the stone but keep the original intended appearance?