Season 20 - Ask This Old House Episodes

Nathan explains the anatomy of track saws; Mark repoints an outdoor pizza oven; The Ask This Old House team comes together for a 20th Anniversary "What Is It?"

In this episode, Mark explains finishes for brick and concrete; Jenn shows how to maintain a small backyard pond, and Tom builds a three-legged Demilune table.

In this episode, Tom shares a trick to evenly space balusters; Heath shows how to drill holes in studs to run wire; Jenn Largesse builds DIY deck chairs; Richard explains how to deal with a damp basement.

Mauro shares why he became a painter and what he loves about his job; Jenn shows how to test soil at home; Heath adds a receptacle to a kitchen island.

In this episode, Heath Eastman shares why he became an electrician, and Mauro Henrique shows a trick for applying caulk in gaps. Then, Tom Silva demonstrates how to install crown molding around corner angles, and Ross Trethewey explains the future of solar at MIT.

In this episode, Kevin O’Connor shares how he became the host of Ask This Old House, and Tom Silva shows a trick for drawing a perfect ellipse. Heath Eastman moves a light fixture, and Mauro Henrique patches the ceiling. Then, Nathan explains the basics of finish nailers.

In this episode, the Ask This Old House team members talk about their fathers as mentors. Then, Richard and Ross Trethewey explain airflow in buildings, and Tom Silva finishes a baseball bat display case.

Watch as Heath demonstrates using common electrical tools. Later, Ross conducts an in-depth home energy assessment, and Mauro shares one of his favorite painting tips.

In this episode, Jenn talks about different types of succulents. Richard installs a reverse osmosis under-sink water filter, and then Tom builds a classic milk stool.

Richard shows how to replace a toilet seat; Jenn Largesse builds a pergola for her backyard; Nathan repairs a century-old full mortise lockset.

Watch as Jenn shows off different varieties of hydrangeas; Heath explains the types of smoke and carbon monoxide detectors and their functions, and Mauro refinishes deck railings and posts.

In this episode, Ross shares why he became an engineer. Tom talks about different types of hammers, and Richard shows how to control common plumbing emergencies. Then, Nathan removes and replaces a garage door.

In this episode, Nathan shows how to mount a flat-screen TV on a wall, Mark builds a stone birdbath, and Tom repairs a newel post damaged by a dog.

Jenn Nawada suggests houseplants for areas of shade, partial shade and sun; Jenn Largesse shows how to put up an outdoor vinyl fence; Tom Silva builds a beehive out of wood.

Nathan shares how he became a carpenter and what he loves about the trade; Heath talks all about different LED lightbulbs; Richard fixes a wobbly toilet and repairs a sticky faucet handle.

Nathan demonstrates how to fix scratches on wood furniture; Jenn Largesse oversees the installation of a shipping container pool in her backyard; Tom shows how to re-secure a sagging fence gate.

Tom shares how he became a general contractor; Heath and Ross explain what smart electric panels are and how they work; Jenn and Nathan build and fill new window flower boxes.

In this episode, Heath Eastman breaks down the basic voltages of cordless tools. Then, Richard Trethewey explains how to fix simple clogs in sinks and toilets. Finally, Mark McCullough repairs a fireplace and replaces its cover.

Watch as Jenn Nawada explains composting, and Jenn Largesse and her landscape contractor install a concrete block retaining. Later, Tom constructs custom built-in drawers, cubbies, and shelves for a front hall closet.

Watch as Nathan Gilbert shows how he organizes his work truck. Richard Trethewey explains different bidets, and Mauro Henrique spray paints a handrail. Then, Mark McCullough helps a homeowner replace an old patched driveway.

Jenn visits a fourth-generation nursery to learn how shrubs are grown; The team shares cost-effective ways to seal existing windows; Tom builds a sturdy serving tray with box joints.

In this episode, Richard shares what he loves about the plumbing trade; Ross talks about smart thermostats and their features; Heath explains how to understand switch legs; Tom replaces a rotted porch column base.

Jenn and Mark show how to make a stone water fountain; In Tool Lab, Nathan breaks down miter saw blades; The team discusses the challenges they’ve faced dealing with ongoing supply chain issues.

Jenn Nawada shares how she became a landscape designer; Richard and Ross Trethewey explain cost-effective ways to save money on your heating bill this winter; Nathan Gilbert helps a homeowner replace a vinyl kitchen floor.

The entire cast reflects on how the show was made, what they’ve accomplished, and what they think the legacy of the television program will be moving forward

In this episode, Heath explains why finish electrical work is his favorite stage of the job; Mauro demonstrates how to repair a crack in plaster; Mark raises a drywell in a driveway that is sinking below grade.

Watch as Mark shares the story of how he became a mason; Tom explains why wood rots on houses, how to prevent it, and how to repair it if it occurs; Ross explores heat pump technology.

In Tool Lab, Nathan explains the different table saw blade types; Ross extends WiFi service in a house; Richard replaces a faulty tub drain; the team shares their New Years’ Resolutions.

In this episode, Jenn explains how to identify and care for holly plants; Richard explains how dishwashers work and how to troubleshoot them when they don’t drain properly; Tom and Kevin turn Christmas ornaments.

Watch as Tom Silva works with a young woodworker to set up a kids’ workshop in her father’s garage. He helps her build a workbench, set it up with tools and handy storage, and then build a birdhouse.

In this episode, Nathan explains the options for drill drivers, and Heath describes when and how to use a voltage tester. Then, Mauro shows how to hold a paintbrush, and Mark helps a homeowner extend her existing patio.

The entire team comes together to help Mason Mark McCullough rebuild the chicken barn he lost to a fire. They reframe the barn, hook up new electrical wiring, connect a utility sink, and hang an exterior door.