Certified arborist Jack Kelly shows landscape contractor Roger Cook a treatment of horticultural oil that will protect the property's hemlocks.  Kevin meets curator Nancy Jones for a tour of the legendary Longfellow House.

Kevin lends Norm and general contractor Tom Silva a hand framing in the "not quite flat" roof above the library.  Richard Trethewey shows Kevin a new software program that allows him to design the HVAC system on a laptop.