Chimney specialist Mark Shaub uses his “fluecam” to look for reasons why the chimney at the Winchester, Mass., house is smoking. Also: contractor Tom Silva shows how the kitchen addition is reinforced and works on the deck structure for the new sun porch; and host Steve Thomas examines the cantilever at Frank Lloyd Wright's Fallingwater house in western Pennsylvania. On “Ask This Old House”: projects include cutting wooden bungholes and installing them on decking. Also: Richard Trethewey on plumbing torches; painter Jim Clark on why new paint can crack and peel in bathrooms; Silva on outdoor lattices.