Synopsis

In the ninth season of *Ask This Old House*, plumbing and heating specialist Richard Trethewey begins by assisting a Canadian homeowner with the installation of a new kitchen sink. Meanwhile, in the loft, general contractor Tom Silva presents host Kevin O'Connor with essential tools for any well-equipped home workshop. Finally, landscaping contractor Roger Cook and arborist Matt Foti work to save a tree from the damaging effects of improper mulching techniques.