Ask This Old House - Season 4 - Eps 7: Moss, Algae and Lichen; Leaky Water Valve; Planting Shade
General contractor Tom Silva shows a homeowner how to remove moss and lichen from his shade-covered roof and keep them from coming back. Then Tom, along with plumbing and heating expert Richard Trethewey, landscaping contractor Roger Cook, and host Kevin O'Connor ask, "What is it?" Up in the loft, Richard shows Kevin how to repair a leaky valve by replacing the washer and valve seat. Then, Roger helps a homeowner plant shade-loving groundcover under a 100-year-old beech tree.
About Ask This Old House

Title: Ask This Old House
First Air Date: 2002-10-10
Last Air Date: 2025-02-20
Status: Returning Series
Rating: 4/10 (from 16 votes)
Language: EN
Seasons: 23
Total Episodes: 615
Network: PBS
Genres: Documentary
Production Companies: This Old House Productions, GBH, WETA
Synopsis
The crew at This Old House take on some pretty big projects, which means they can only work on one or two houses a year. But homeowners have a virtual truckload of questions on smaller projects, and the This Old House crew is ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by viewers - and the crew even makes house calls!
Cast

Richard Trethewey
Himself

Norm Abram
Himself

Roger Cook
Himself

Kevin O'Connor
Host

Tom Silva
Himself

Steve Thomas Rooney
Himself