Tom marries the addition's new roof to the old by graduating the rafters. Architect David Whitney explains how just 200 additional square feet will transform this house. Masonry repairs with a new mortar additive provide a waterproofing solution for the fieldstone basement. Roger tours the Italianate Garden at Elm Bank; Norm and Tom perform surgery to re-open a door in the foyer. In the second half of the hour, on ASK THIS OLD HOUSE, Richard visits Charlotte, North Carolina, to install a whole-house humidifier. Kevin and electrician Scott Caron install hardwired smoke and carbon monoxide detectors for a young family in Indianapolis. Tom shows how to remove stripped screws. And the guys ask, "What is it?"
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