Ask This Old House

Nathan heads to Tulsa, OK, to build a replacement utility cover; Ross discusses low-level carbon monoxide exposure and differences in CO detectors and monitors; Mark helps a homeowner clean out creosote build-up in their brick kitchen fireplace.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Nathan travels to a Sears kit house to tighten a loose stair railing; Mauro demonstrates how to strip paint off old door hardware; Heath explains the uses and purposes of electrical boxes; Richard replaces an old thermostat with a smart thermostat.

Richard replaces a shower valve he has never seen before in his career with a conventional pressure balanced one; Nathan demonstrates how to refinish stair treads; Tom helps a homeowner remove moss from his roof and prevent it from growing back.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Jenn installs a unique kind of indoor garden for a homeowner who wants to grow vegetables year round; Tom explains the basics of using a hole saw; Mark replaces a common terra cotta hearth with slate tile.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Heath helps a homeowner install a generator hook up to the homes circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark fixes an insufficient brick lintel repair on an 1833 home.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Nathan demonstrates a mobile CNC routing machine; Tom teaches a young woodworker how to build a dog dish stand using primarily power tools; Heath explains different methods for wiring a portable generator to a house; Ross gives an update on an app.

Jenn travels to Washington D.C.; Mark learns about how Mount Rushmore was built and demonstrates techniques for cutting stone; Nathan visits Abraham Lincoln's house and helps a homeowner replace traditional mortise hardware with hardware that locks.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Ross tests out some new smart lighting configurations; Tom helps a homeowner build a custom screen door to fit her unique front entryway; Mauro teaches a homeowner some techniques to paint old 1960s wood trim with a varnish on it.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Mauro shares the importance of prep work. Then, he and Kevin whitewash an outdoor bench; Tom learns how double pane glass is made and then repairs a broken window.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Kevin works with Jenn Largesse to demonstrate a technique on a trim router; Heath grounds an outlet for a homeowner; Mauro explains different paint rollers and demonstrates good rolling techniques; Mark replaces malfunctioning fireplace doors.

Richard helps a homeowner replace the plumbing components in his pedestal sink; Heath discusses new technology for bathroom vent fans; the team shares home inspection nightmares; Tom explains how to clean dirty tile grout using household supplies.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Mark helps an expecting couple install a concrete paver patio; Jenn discusses the common elements she includes in outdoor kitchen designs; Tom and Kevin build a combination bench/shoe rack out of fir decking.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Jenn heads to Portland, Oregon to help a couple install a rain garden; Ross shares how moisture meters can detect unseen water damage; Mark installs a railing on concrete steps.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Tom explains the architecture, installation, and maintenance of white cedar shingles; Richard explains some of the common failure points in hose spigots and how to repair them; Jenn travels to Raleigh, North Carolina to help a couple build and plant a self-watering vegetable garden.

Richard tests a new kind of faucet; Mark travels to Chicago to install a wood mantel on a homeowner's 1980s contemporary fireplace; Ross and Mauro discuss how to remove a cigarette smell from a home and why it is important to do so; Heath helps a homeowner connect four separate switches that control six lights in the same room.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Nathan travels to Missouri to install a set of bypass doors for a pantry; Richard tests two different styles of smart automatic water shutoff valves; Ross explores the design and testing of asphalt roof shingles that can reflect some of the sun's heat away from the building.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Lee shares key tools and products in a winter weather kit; Richard shares a unique water heater; Mark shares homeowner-friendly masonry tools; Tom and Kevin build a new miter saw station.

Heath shares what factors to consider when selecting a generator and the options available; Jenn shows how to build a worm farm; Mauro heads to Oklahoma to repaint a homeowner's front door.

Heath shares what factors to consider when selecting a generator and the options available; Jenn shows how to build a worm farm; Mauro heads to Oklahoma to repaint a homeowner's front door.

In Tool Lab, tool expert Chris Ermides demonstrates how tables saw blades work; Heath explains why and how to use a voltage tester; Mark helps a homeowner extend her existing patio.

Heath shares what factors to consider when selecting a generator and the options available; Jenn shows how to build a worm farm; Mauro heads to Oklahoma to repaint a homeowner's front door.

Kevin learns how quartz countertops are manufactured and then helps install one in a homeowner's kitchen; Nathan explains the proper way to hang and display a U.

Nathan shows Kevin some interesting drywall paneling he recently found in an older house; Richard travels to New York City to teach a homeowner how to clean her shower cartridge when it gets clogged; Tom teaches Kevin the basics of using a lathe and then they turn a bowl together.

Heath shares what factors to consider when selecting a generator and the options available; Jenn shows how to build a worm farm; Mauro heads to Oklahoma to repaint a homeowner's front door.

Heath shares what factors to consider when selecting a generator and the options available; Jenn shows how to build a worm farm; Mauro heads to Oklahoma to repaint a homeowner's front door.

Heath shares what factors to consider when selecting a generator and the options available; Jenn shows how to build a worm farm; Mauro heads to Oklahoma to repaint a homeowner's front door.

Heath shares what factors to consider when selecting a generator and the options available; Jenn shows how to build a worm farm; Mauro heads to Oklahoma to repaint a homeowner's front door.

Heath shares what factors to consider when selecting a generator and the options available; Jenn shows how to build a worm farm; Mauro heads to Oklahoma to repaint a homeowner's front door.

Nathan gives a homeowner a backyard entrance by converting a window into a backdoor; The team discuss dealbreakers homeowners should consider when looking to buy a home without major renovations.

Nathan gives a homeowner a backyard entrance by converting a window into a backdoor; The team discuss dealbreakers homeowners should consider when looking to buy a home without major renovations.

Wash your hands, mask up, and stay 6 apart with Erik as he learns about and navigates a new travel world emerging from the COVID-19 pandemic.

Nathan gives a homeowner a backyard entrance by converting a window into a backdoor; The team discuss dealbreakers homeowners should consider when looking to buy a home without major renovations.

Nathan gives a homeowner a backyard entrance by converting a window into a backdoor; The team discuss dealbreakers homeowners should consider when looking to buy a home without major renovations.

Nathan gives a homeowner a backyard entrance by converting a window into a backdoor; The team discuss dealbreakers homeowners should consider when looking to buy a home without major renovations.

Nathan gives a homeowner a backyard entrance by converting a window into a backdoor; The team discuss dealbreakers homeowners should consider when looking to buy a home without major renovations.

Nathan gives a homeowner a backyard entrance by converting a window into a backdoor; The team discuss dealbreakers homeowners should consider when looking to buy a home without major renovations.

Nathan gives a homeowner a backyard entrance by converting a window into a backdoor; The team discuss dealbreakers homeowners should consider when looking to buy a home without major renovations.