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.
| Title | Ask This Old House - Season 4 Episode 7 Moss, Algae and Lichen; Leaky Water Valve; Planting Shade |
|---|---|
| Year | 2025 |
| Genre | Documentary |
| Country | United States of America |
| Studio | PBS |
| Cast | Richard Trethewey, Norm Abram, Roger Cook, Kevin O'Connor, Tom Silva, Steve Thomas Rooney |
| Crew | |
| Alternative Titles | |
| Keyword | home renovation |
| First Air Date | Oct 10, 2002 |
| Last Air date | Jan 09, 2025 |
| Season | 23 Season |
| Episode | 603 Episode |
| Runtime | 30:14 minutes |
| Quality | HD |
| IMDb: | 3.70/ 10 by 15.00 users |
| Popularity | 51.723 |
| Language | English |
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