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S20 E39, Mark McCullough repairs an outdoor pizza oven

S20 E39: Pizza Oven Repair, What Is It?

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?"

S20 E38, Jenn Nawada helps maintain a backyard pond

S20 E38: Pond Maintenance, Demilune Table

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.

S20 E37, Richard Trethewey discusses keeping basements dry with Kevin O’Connor

S20 E37: Deck Chairs, Damp Basement

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.

S20 E36, Jenn Nawada teaches Kevin O’Connor how to test soil

S20 E36: Soil Testing, Adding a Receptacle

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.

S20 E35, Tom Silva demonstrates crown molding to Kevin O’Connor

S20 E35: Crown Molding, Future of Solar

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.

S20 E34, Nathan Gilbert discusses finish nailers

S20 E34: Light Fixture, Finish Nailers

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.

S20 E33, Ross Trethewey assists his father Richard in explaining air flow to Kevin O’Connor

S20 E33: Celebrating Fathers as Mentors

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.

S20 E32, Heath Eastman discusses electrical tools in the Tool Lab

S20 E32: Electrical Tools, Energy Audit

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.

S20 E31, Jenn Nawada discusses succulents

S20 E31: Succulents, Water Filter

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.

S20 E30, Richard Trethewey shows Kevin O’Connor how to replace a toilet seat

S20 E30: Toilet Seat, Lockset Repair

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

S20 E29, Mauro Henrique refinishes a deck rail

S20 E29: Hydrangeas, Deck Railing

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.

S20 E28, Richard Trethewey shows Kevin O’Connor how to fix common plumbing emergencies

S20 E28: Garage Door, Plumbing Fixes

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.

Mark McCullough teaches Kevin O’Connor how to build a stone bird bath

S20 E27: DIY Birdbath, Newel Post Repair

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.

S20 E26, Kevin O’Connor and Tom Silva build a beehive

S20 E26: Outdoor Vinyl Fence, Beehive

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.

S20 E25, Heath Eastman discusses LEDs with Kevin O’Connor

S20 E25: Wobbly Toilet, LED Lightbulbs

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.

S20 E25, Nathan Gilbert as an apprentice with Tom Silva

How Nathan Gilbert Became a Carpenter

Ask This Old House carpenter Nathan Gilbert takes us along his journey through the carpentry trade.

S20 E24, Tom Silva fixes a sagging fence gate

S20 E24: Fence Gate, Container Pool

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.

S20 E23, Jenn Nawada and Nathan Gilbert build window boxes

S20 E23: Window Boxes, Smart Panels

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.

S20 E22, Mark McCullough repairs a fireplace

S20 E22: Fireplace Repairs, Simple Clog Fixes

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.

S20 E21, Tom Silva shows how to build built-ins for a closet

S20 E21: Hall Closet, Block Retaining Wall

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.

S20 E20, Mauro Henrique shows Kevin O’Connor how to use spray paint

S20 E20: Concrete Driveway, Spray Paint

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.

S20 E19, Jenn Nawada learns about yews

S20 E19: Harvesting Shrubs, Box Joint Jig

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.

S20 E18, Tom Silva replaces a porch column

S20 E18: Porch Column, Smart Thermostats

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.

S20 E17, Jenn Nawada and Mark McCullough show their newly-built stone water fountain to Kevin O’Connor

S20 E17: Water Fountain, Supply Chains

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.

S20 E16, Nathan Gilbert installs a vinyl plank floor

S20 E16: Replace Vinyl Floor, Heating Bill Savings

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.

S20 E15, 20th Anniversary

S20 E15: Celebrating 20 Years

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

S20 E14, Mauro Henrique teaches Kevin O’Connor about plaster

S20 E14: Patch Plaster, Sinking Drywell

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.

S20 E13, Tom Silva explains how to identify wood rot to Kevin O’Connor

S20 E13: Rot Repair, Heat Pumps

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.

S20 E12, Richard Trethewey repairs a tub drain

S20 E12: WiFi Extension, Tub Drain

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.

S20 E11, Tom Silva builds Christmas ornaments

S20 E11: Holiday Projects

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.

S20 E10, Tom Silva helps set up a kids’ workshop

S20 E10: Camilla’s Workshop

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.

S20 E9, Nathan Gilbert discusses drill/drivers

S20 E9: Drill Drivers, Patio Expansion

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.