i suppose the only real way is to get up there and physically have a look.
About a year ago we had our valleys re done with lead (origonally done in zinc) but i do not know what you allowed to use in the U.S.A
If we look under the tiles it is possible to see that the lead actually does go under the tiles
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local