This Old House - Season 25 Episode 11

Kevin finds Roger inspecting a new shipment of select bluestone from Pennsylvania and cobblestones imported from India. Out back, Roger shows Kevin the right way to lay a bluestone patio using stone dust and cement over three feet of pack for drainage. Inside the cottage, Tom shows Kevin how wallboard contractor Paul Landry is hanging wallboard - it's a new product that's non-combustible, moisture resistant, and mold resistant - an important innovation as mold problems continue to plague the building industry. Richard shows Kevin the air-to-air heat exchanger (which will bring fresh air into the building) and a new radiant heat system that's installed in the outside walls going up the stairs. Kevin meets up with Janet and interior designer Tricia McDonagh for a preview of her design choices for the cottage. Holly takes Kevin to Acton, Massachusetts to see the in-law suite that she created for homeowner Sylvia Arrom's 90-year old parents. In the kitchen of the main house, family friends