Kevin meets Richard in the basement and learns about the plan to keep the existing boiler but add a ducted system and a condenser for air conditioning. Tommy's excavation crew replaces the old steel main water line at the front of the house. Kevin learns how mason Mark McCullough lays brick for the new porch piers. Kevin finds Tommy pouring a concrete "rat slab," which will protect the mudroom against moisture and critters. Richard visits the tile showroom where homeowner Katherine and designer Amanda Reid are making final selections for the bathrooms.