Richard treats hard water; Tom builds a shadow box using wood from an old door

Tom teaches a young fan how to build a tool box; Scott installs smart smoke and carbon monoxide detectors in Charlotte; Richard diagnoses a leaking temperature and pressure relief valve and installs an expansion tank to fix it.

A homeowner has never tiled before, so Tom teaches her how using a simple technique; Richard demonstrates a wireless leak detector that prevents floods; Jenn installs a water feature that collects and reuses rainwater.

Roger helps a homeowner reseed a dead section of lawn and blend it in with the rest of the yard; Richard shows the basics of changing a toilet; in Future House, Ross sees an off-the-grid home in South Carolina that's testing commercial HVAC equipment.

Richard replaces a small radiator with one that's the correct size; Roger demonstrates the importance of sunscreen on the job site; in Milwaukee, Mason Mark McCullough makes his first house call to teach a homeowner how to repoint brick.

Richard breaks down the differences between water filters; Roger removes a tree that's leaning dangerously toward a house; Tom demonstrates different ways to locate studs in a wall; Scott installs a smart garage door opener

It's the holiday season at the AskTOH barn! Tom and Kevin build a toy box for Tom`s grandson; Kevin travels to UL Laboratories in Chicago to learn about preventing fires from holiday decorations; the guys exchange gifts

Tom fixes a window; Mark cleans brick; Ross sees a solar panel that makes drinking water

On the next episode of Ask This Old House...Roger teaches his apprentice how to not only repair a damaged walkway, but also how to identify what caused the damage so it can be prevented in the future, and more

Mark tests new tools; Richard shims a toilet; Kevin builds a table with Jimmy Diresta.

Richard installs a tankless water heater in Milwaukee; Mark rebuilds a retaining wall.

Richard shows Kevin the proper way to ventilate a sink; in Nashville, Tom converts a regular door into a Dutch door; Jenn updates a landscape by moving around, dividing, and pruning the current plants in the yard.

Roger installs a downspout alternative; painter Mauro Henrique explains the differences between various types of paintbrushes; Richard installs a vanity for homeowners who gave up on it seven years ago; Tom shows closet storage options

Roger tends to a newly seeded lawn; Tom visits a computer-based workshop in San Francisco

Richard repairs a water system with air in it; Mauro teaches how to paint a room

In the aftermath of Hurricane Harvey, AskTOH heads to Texas to follow the rebuilding effort

Mark installs a metal railing; Richard analyzes steam heat; Tom replaces a broken tile

Jenn builds a planter out of a feeding trough; Kevin builds a sign with Jimmy DiResta

Richard analyzes frozen air conditioners; Tom fixes a railing; Ross tours a smart house.

In Nashville, Richard repairs and replaces a leaking shower valve; Roger explains safety features built into all chainsaws; Kevin makes a bucket stool with Ben Uyeda, a maker best known for his design-based online videos