Hi I bought a house built in 1820s the kitchen was very small and there was a room just behind it that was built last year by the old owner.so I hired a carpenter to remove the wall. as he was taking down the wall he said that it use to be a exterior support wall he showed me the header and it was really old hand cut 5'1/2 x 10'1/2 x 16 feet he said this is a strong enough beam to hold up the one story roof on this side of the house. is this true? or should I get a second opinion?