Ask This Old House

A nonprofit that creates urban pollinator gardens around Detroit; soil preparation, planting techniques and maintenance; removing a brick driveway apron and replacing it with cobblestones.

Adding a new zone to an irrigation system; comparing the strengths and differences between PEX and copper piping; repairing a door hinge by using wooden dowels, epoxy and longer screws.

The basics of dethatching and aerating; installing a smart home energy monitoring system; the different types of routers.

Maintaining a mini split and properly cleaning the indoor and outdoor components; building a garden retaining wall.

Diagnosing and treating a diseased pine tree; performing maintenance inspections.

Building an outdoor shower in Cape Cod; landscape touches.

Painting stair treads and handrail; highlighting new tools; installing new wall sconces above a fireplace.

A company that builds homes using 3D printing; landscaper Aaron Smith; using a lathe to turn a square bowl with legs.

Painting wainscoting; what homeowners should know before switching a home to all electric; building a sandbox.

A Detroit beekeeper talks about how to start a hive; phone apps that have made work easier; building a step stool using a mobile CNC router.

Converting a wood burning fireplace to gas; installing flat panel wainscoting.

Installing a shed base, framing an interior non-load bearing wall, installing bifold double doors.

Replacing a broken double trash can pull out; why incandescent and fluorescent lights are being phased out; removing overgrown arborvitae trees.

Installing a whole house humidifier system; how to quickly paint shutters in bulk; creating a triangular top outdoor end table out of teak wood.

Creating a focal point wall; common sprinkler heads; installing a submersible sump pump to solve a flooded basement problem.

Solving gutter water runoff; lead carpenter Lasana Harper talks about his journey into carpentry; replacing a ceiling fan.

Installing a bathroom recessed cabinet; replacing a chimney that has been causing water damage to an indoor charcoal grill.

Restoring a bulkhead; combination squares; repairing crumbling mortar on brick front stairs.

Tropical trees for the backyard; a tool that makes asphalt roof work easier; home smart light products.

Repairing cracked drywall; installing radiator baseboards.

Making a bathroom more accessible; restoring rotten wooden gutters

Mauro Henrique shows a homeowner how to brighten up her basement apartment by painting with various paint concentrations; Richard Trethewey and Mark McCullough explain a variety of culprits and solutions for basements that are struggling with water issues; In Build It, Kevin O'Connor and Tom Silva show how to construct a bat house.

Jenn helps a couple rethink their front yard after two removed trees changed the shade pattern of the space; Richard talks about the mentors who helped him become a passionate teacher on This Old House; Richard gives Kevin a tour of the building he and his son, Evan Trethewey, have renovated to bring a new experience of mechanical equipment to contractors

Jenn Nawada and Nathan Gilbert travel to Tulsa to learn about the city's rain barrel and stormwater management initiatives and help a homeowner install one in her own garden; Mark McCullough helps a homeowner redirect pooling water on her patio with a weep hole drilled into the stone wall; the team goes through a few new additions to their tool bag that they've enjoyed having on hand lately.

Richard Trethewey shares his appreciation for modern plumbing, then helps a homeowner with an all-electric heating system retrofit a radiant floor system under their bathroom; Nathan Gilbert shares connection options and maintenance for cable railings; Jenn Nawada shares changes to the USDA Plant Hardiness Zone map and how to use the information to select the best plants for a landscape.

Lee Gilliam helps a homeowner figure out why grass doesn't grow in his backyard before installing a shade-tolerant species of sod; Ross Trethewey talks through converting houses' heating and cooling systems to heat pumps; Kevin O'Connor meets maker Sarah Nadarajah, the creator of Rocky Canyon Rustic, to learn about her content before building a replica high-end side table.

Nathan Gilbert helps a homeowner add shade to a pool area using a shade sail and unique anchor points; Ask This Old House spotlights the brothers of Jordan's Legacy Landscaping, a fourth-generation landscaping company in the Atlanta area; Mark McCullough helps a landlord make a cost-effective repair to her tenant's concrete walkway.

The Ask This Old House team head to California to explore a variety of ways that homeowners can protect their houses against wildfires. Jenn Nawada learns about local flora and helps firescape a front yard, Tom Silva learns how to fire harden a home's exterior, and Richard Trethewey learns a unique weeding technique that helps to mitigate the risk of fire spreading.

Lee Gilliam helps a homeowner clean up his backyard by removing a diseased tree and shows how to remove and maintain invasive plants; Mark McCullough discusses the function of chimney caps, options available, and how homeowners can know if they need to install one; Richard Trethewwey installs a toilet with a built-in bidet for a homeowner and shares the variety of options available.

Mauro Henrique discusses how he sees color, and shares some of his favorite colors to use for projects; Then, he updates a homeowner's office by painting over dated wood paneling with the perfect dark blue; Lee Gilliam discusses various shrub pruning tools; Nathan Gilbert heads to Portland, Oregon to help a homeowner build a sensory mud kitchen for her at-home daycare.

Heath Eastman shares his tips and tools homeowners can use to identify and label home circuit breakers; Tom Silva discusses his hobby of lathe turning, why he enjoys it, and shares some of his favorite pieces he's created. Then, in Build It, he shows how to turn a segmented bowl, which is comprised of multiple pieces of wood glued together and turned, creating a unique visual effect.

Richard Trethewey helps a homeowner troubleshoot why her upstairs shower runs out of hot water so quickly and helps her install a heat pump water heater; Kevin O'Connor returns to maker Jimmy DiResta's workshop in Upstate New York to get a lesson in leatherworking as they hand stitch a leather tote bag.

Nathan Gilbert shares his love of flea markets, what items he's found, and what he recommends looking for; Mauro Henrique teaches a homeowner how to paint over old garage graffiti and which primer is right for the job; Ross Trethewey shares how radon tests can detect harmful levels of radon in homes; Nathan helps a homeowner ready her nursery for a second baby by installing closet shelving.

Nathan Gilbert helps a homeowner create a backyard entrance by converting a window into a backdoor; The team discusses what they look for in houses for sale that could be considered deal breakers for homeowners not looking to undertake major repairs or renovations.

Heath Eastman shares what factors to consider when selecting a generator, such as fuel or electrical load, and the options that are available; Jenn Nawada shares how to build a worm farm, what foods to incorporate and exclude when feeding the worms, and the many benefits of worm composted soil; Mauro Henrique refreshes a homeowner's vintage front door with a fresh coat of paint.

Lee Gilliam shares the key tools and products to include in a winter weather kit to prepare for winter; Mark McCullough shares his favorite homeowner-friendly masonry tools and how to use them for entry level projects; Tom Silva and Kevin O'Connor upgrade the workspace by building a new mobile miter saw station, featuring two work benches and cabinets for extra storage.

Jenn Nawada teams up with a water conservation expert in Portland, Oregon to help two homeowners install a rain garden; Ross Trethewey shares how moisture meters can detect unseen water damage; Mark McCullough helps a homeowner increase the safety of their concrete steps by installing a wrought iron railing and showcases how railings are made at an iron fabrication facility.

Mauro Henrique shares the importance of prep work for any painting project, and why homeowners shouldn't skip it. Then, Mauro and Kevin O'Connor team up to refinish an antique outdoor bench with a whitewash stain; With a glass expert's help, Tom Silva learns how double pane glass is made while helping a homeowner repair a broken window.

Heath Eastman assists a homeowner who wants to hook up a generator to their home by installing a transfer switch to the circuit board; Environmental contractor, Ron Peik demystifies asbestos and shares options for mitigation; Mark McCullough fixes a faulty brick lintel repair on an 1833 home, discusses the difference between Flemish and American bond, and how to match existing mortar and joints.

Nathan Gilbert heads to Tulsa, Oklahoma to build a replacement utility cover. Ross Trethewey discusses low-level carbon monoxide exposure, symptoms, and differences in CO detectors and low-level monitors. Mark McCullough helps a homeowner clean out creosote build-up in their kitchen fireplace and explains the dangers of creosote build-up, options for removal, and the safety preparation involved.

Ask This Old House welcomes landscape contractor, Lee Gilliam to the cast and shines a spotlight on his 30 years of experience; Richard Trethewey helps a homeowner repair a leaking 3-valve shower while retaining the bathrooms original 1930's tile; Lee and Jenn Nawada work together to refresh a homeowner's eroding sloped yard; removing excess mulch, and installing boulders and ground cover plants.

Heath Eastman helps a homeowner install outdoor-grade remote-controlled patio string lights over their backyard patio; Mauro Henrique color matches a homeowners retro aqua kitchen cabinet and repaints it to match the rest of the vintage kitchen; Mauro takes a sample of the aqua-colored kitchen cabinet and heads to Home Depot to demonstrate the color matching process.

Nathan Gilbert shares his own experience as a Boy Scout and introduces his niece's Girl Scout troop and the project they need help with; Tom Silva and Kevin O'Connor create a two-layered hexagonal herb planter for the garden; Jenn Nawada and Nathan pick up materials to build a garden bed and then team up to help the Girl Scout troop rebuild and replant their community garden beds.

Richard helps a homeowner dealing with cold bath water by installing a reserve tank to fill the bathtub fully with hot water; Mauro shares his favorite tips for cleaning up after painting projects; Tom and Kevin work together to build a set of cornhole boards and after, the Ask This Old House cast come together for a head-to-head cornhole tournament.

Jenn creates a thoughtful backyard entrance; Mark shares how to safely clean hardscaping on different types of common hardscape materials; Tom shows how to patch holes in wood floors caused by previously removed radiators.

Jenn helps a homeowner transform a small sun and shade backyard with a new garden; Tom explains the importance of gutter downspouts; Mark adds street visibility to a farm by remounting an original farm sign and engraving an 1800s granite post.

Ross helps a homeowner dealing with ice dams decide whether to insulate from his attic roof rafters or the attic floor; Richard shares tips on irrigation repairs; Mark expands a driveway by adding an asphalt parking spot.

Richard helps a homeowner replace a leaking gas oven; Jenn and Kevin discuss how to create a pollinator garden at home; in Future House, Ross learns how wireless electricity technology can be applied to electric vehicle chargers in future homes.

Mauro helps a homeowner upgrade a fireplace; Jenn introduces landscape contractor Lee Gilliam, and together they discuss different landscape tools and how to maintain them for Spring; Tom and Kevin Build a bathtub tray out of zebrawood.

Jenn works with a wetlands specialist; Ask This Old House profiles general contractor Zach Dettmore in a new segment; Ross discusses Indoor Air Quality testing; Mauro teaches a homeowner how to repaint an exterior, concrete foundation.

Nathan heads to Texas to help a mom of six organize her family shed; Richard emphasizes the importance of a yearly service call for furnaces; Mark installs a pea stone walkway to match an existing walkway in front of the homeowner's house.

Jenn shares why she loves bringing her dog to work; Heath helps a homeowner troubleshoot a strobing dimmer switch; Ross explains the benefits of smart bath ventilation; Tom builds a DIY clothes rack.

Tom repairs a homeowner's antique window; Mauro talks through interior paint finishes; Jenn and Mark travel to Georgia to help a homeowner develop a landscape design plan for her small backyard. Then, they help her install a stone fire pit.

In a special episode, the team partner with Rebuilding Together Boston. With the help of the Ask This Old House extended family and volunteers, the crew repair a deck, construct a patio, and install landscape lighting and new plantings.

Nathan, Heath, and Mauro help a homeowner baby proof her house by replacing old receptacles and installing cabinet locks, and baby gates; Jenn breaks down the basics of caring for houseplants; Richard explains how septic systems works and maintain them.

Nathan and his dad, Bill, help install an 1800s pocket door with reclaimed hardware; Ross explains the technological advancements of induction cooktops; Kevin meets maker Char Miller-King and build a Shaker-style-inspired end table together.

The team shares the professions they might have pursued; Mauro discusses types of wallpaper and tools to remove it; Heath explains how different amped receptacles can cause breaker trips; Nathan helps install kitchen cabinet hardware.

Tom and Kevin team up to build a Little Free Library for an elementary school; Tom and his daughter, Kate, paint and decorate it to look like a school bus. Tom and Kevin meet up with students to help them install it and add their favorite books.

Richard helps remove an old 40-gallon hot water tank; Heath shares safety tips for holiday light decoration; Tom explains how to identify, repair, and prevent woodpecker damage; Mauro shows how to paint over bathroom tile using epoxy acrylic paint.

Mark travels to Dallas, Texas to repair sandstone steps; Ross explains how to pick a solar plan how to avoid being scammed by a solar company; Nathan helps a homeowner install an awning.

Kevin O'Connor visits the Franklin Pierce Homestead in New Hampshire to learn about the restoration of a historic, French wallpaper from the 19th century; Heath Eastman explains the basics of GFCI receptacles; Tom Silva helps a homeowner repair and repitch the gutters above their back patio.

Jenn plants a native woodland garden; Mauro shows how to patch cracked or chipped porcelain; Mark explains common chimney problems and then shows how to repair a chimney step by step.

In this episode, Heath installs a doorbell with new wiring, Richard explains bottle traps, and Mark replaces a homeowner’s brick driveway edging with cobblestones.

Heath explains the three levels of EV chargers and which scenarios they work best for; Mark breaks down different brick patterns, where they originate from, and their pros and cons; Nathan helps a homeowner repair a cracked built-in china cabinet using MDF panels; Mauro then repaints the china cabinet and shows how to paint on MDF.

The Ask This Old House team talks about why they enjoy working together; Richard cuts open a failed water heater, and Jenn shares her love of educating kids about the outdoors. Then, she and Nathan build a compost bin.

Heath shares why he became an electrician and what he loves about his trade; Mauro shows a trick for applying caulk in gaps; Tom shows how to install crown molding around corner angles; Ross explains the future of solar at MIT.

Kevin O'Connor explains how he became host of "This Old House"; a simple trick for drawing a perfect ellipse; moving a light fixture and patching the ceiling; the basics of finish nailers.

Team members talk about their fathers as mentors; airflow in buildings; finishing a baseball bat display case.

Using common electrical tools; an in-depth home energy assessment; painting.

Jenn talks about different types of succulents; Richard installs a reverse osmosis under-sink water filter; 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.

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

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

Nathan shows how to mount a flat screen TV on a wall. Mark builds a stone birdbath. Tom repairs a Newel post damaged by a dog.

Jenn Nawada suggests houseplants for areas of shade, partial shade and sun. Heath explains techniques for drilling holes to run electrical wire. Jenn Largesse shows how to put up an outdoor vinyl fence. Tom builds a beehive out of wood.

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

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

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

Heath breaks down the basic voltages of cordless tools; Richard gives an overview on how to handle simple clogs in a bathroom sink, kitchen sink and toilet; Mark repairs a fireplace and replaces its cover.

Jenn Nawada explains how you can compost at home; Jenn Largesse and her landscape contractor install a concrete block retaining wall in Jenn's backyard; Tom constructs custom built-in drawers, cubbies and shelves for a front hall closet.

Nathan gives a tour of his highly organized truck; Richard shows different kinds of bidets and their functions; Mauro explains how to use spray paint for small home projects; Mark replaces an old, patched driveway with a new concrete one.

Jenn visits a nursery to learn how shrubs are planted and harvested; Ross and Nathan show cost-effective ways to air-seal your windows this winter; Tom demonstrates how to build a serving tray using a box joint jig.

Richard shares how he became a plumber and what he loves about his trade; Ross talks about smart thermostats and their features; Heath explains how to understand switch legs; Tom replaces an old, rotted porch column base.

Jenn and Mark show how to make a stone water fountain for your garden; In Tool Lab, Nathan breaks down Miter Saw blades; The team comes together to discuss the challenges they've faced dealing with ongoing supply chain issues.

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

The entire cast reflects on the 20th anniversary of ASK THIS OLD HOUSE. They'll discuss how the show was made and what they think the legacy of the television program will be moving forward.

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.

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 what different table saw blade types are used for; Ross extends WiFi service in a house; Richard replaces a faulty tub drain; the team shares their New Years' Resolutions.

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.

General contractor and expert woodworker Tom Silva meets past guest and young woodworker Camilla in her dad's shop where they catch up since they last met. After checking out some of Camilla's work, the two discuss her need for a workspace of her own. With a worktable in mind, Tom invites her back to the workshop to help with the special project, a birdhouse.

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.

The entire team comes together to help Mark 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.

Jenn shares her list of must have gardening tools and how to put a garden to bed before winter; Mauro demonstrates how to paint a kitchen cabinet; Nathan installs exterior front door trim.

Mark explains how bricks are made and how many different varieties there are; Richard explains how solderless connections work; Tom assess and reshingles a shed roof with asphalt shingles.

Ross discusses the pros and cons of smart doorbells; Mauro demonstrates techniques for painting wood paneling; Heath shares some of his most-used tools and helps a homeowner install recessed lights.

Mauro demonstrates how to remove dried paint from a paintbrush; Tom shares the best techniques for connecting and installing tongue and groove flooring; Jenn and Nathan build a DIY ice rink.

Jenn discusses creative options for ground cover plants; Tom demonstrates different techniques for patching wall holes; Mark demonstrates how to patch brick holes; Nathan installs a new threshold.

Jenn creates a landscape that can withstand heavy pedestrian traffic; Richard explains the options available for water heaters; Tom and Kevin build a cutting board out of walnut, cherry, and maple.

Richard discusses pipe soldering; Heath explains what two-prong receptacles are, why they're no longer to code, and how to replace them; Nathan and Mauro build, install, and paint deck stair railings.

Nathan builds a display case to store his grandfather's U.S. flag; Heath replaces a circuit breaker; the team shares the ways their trades were affected by the COVID-19 pandemic.

Kevin and Tom travel to Montana to set up an accessible home gym for a Navy SEAL veteran; Mauro shares how to select the right paint color; Mark updates a fireplace with a stacked stone veneer.

Richard installs a shutoff valve for washing machine supply hoses; Ross and Heath discuss the progression of EV chargers; Jenn discusses ornamental grasses; Nathan helps a homeowner repair her deck.

Richard and Nathan retrofit a new dishwasher into an old kitchen; Mauro paints wood paneling; Tom and Kevin turn a French rolling pin.

Heath performs an electrical inspection; the team share more Home Inspection Nightmares; Tom helps two homeowners meticulously restore their antique front door using a variety of techniques.

Jenn explains how to care for echinaceas; Mark explains how to cut stone with a saw and chisel; Richard replaces a kitchen sink and faucet; Tom helps a homeowner wrap up a few kitchen projects.

Richard explains a variety of failure points in a hose spigot; Mauro demonstrates the how to paint vinyl siding; Jenn explains how and why to maintain pruners; Nathan builds a custom fence gate.

Jenn travels to Orlando to upgrade a homeowner's irrigation system with a smart one; Heath explains a few different ways to troubleshoot flickering lights; Mark repoints a set of brick front steps.

Richard moves baseboard heat from one side of a room to another; Jenn explains the basics of selecting different species of arborvitae; Tom and Kevin build an outdoor bench that doubles as a cooler.

Tom explains how different sanders work and how to sand well; Mauro shows how to use a power washer to clean siding; the team share more home inspection nightmares; Heath installs deck railing lights.

Tom travels to Nashville to turn an original, exterior door into a Dutch door; Richard explains how to install a garbage disposal; Mark and Jenn reface a concrete wall with thin stone veneer.

Ross explores ways that landscaping could be done automatically; Mark goes over different walkway and driveway deicers and how they might impact masonry products; Tom and Kevin build a modern bench.

Mark learns how precast concrete steps are made and then replaces a homeowner's steps; Mauro explains how to refinish an old table; Heath helps a homeowner replace his front lamppost with a new one.

Richard explains how a mini split unit is installed; Jenn explains how to identify Japanese maple trees and how to incorporate them in a landscape design; Nathan installs a butcher block countertop.

Richard replaces a weird shower valve with a conventional pressure balanced one; Mauro repaints a radiator cover with lead paint on it; Tom explains how to identify and remove load bearing walls.

Jenn demonstrates how to clean up a garden; Ross explains how air filters can catch unwanted air impurities and demonstrates how to build a DIY one; Tom and Kevin build an Adirondack chair.

Heath installs landscape lights in a garden; Richard explains how siphons work and how they are used to make a toilet work; Tom organizes tools with pegboard; Mark helps a homeowner redo his walkway.

Nathan helps a homeowner turn a reclaimed beam into a fireplace mantel; Richard demonstrates how to change a bathroom faucet; Ross explores innovations to geothermal installations.

Jenn discusses Christmas trees; Richard explains what can and can’t go down a garbage disposal after holiday dinners; Heath helps a homeowner safely install a variety of Christmas lights.

In this special episode of Ask This Old House, Tom and Mark tell you everything you need to know about fireplaces; Tom builds a custom mantel for a homeowner; Richard discusses fireplace inserts; Mark replaces the hearth of a fireplace with granite.

Jenn and Roger install a variety of different water features to accentuate landscapes; Roger installs an alternative to a downspout; Jenn installs a waterfall feature in a backyard that reuses water.

Tom and Kevin explain everything you need to know about using, installing, maintaining and repairing a window.

In this special episode of Ask This Old House, Jenn explains how various climates across the United States impact the design, care, and maintenance of different landscapes, which includes discussing USDA Hardiness Zones and native plant species.

In this special episode of Ask This Old House, Roger, Jenn and Mark explain best practices for installing or repairing a walkway; Mark helps a homeowner install a brand new walkway using natural stone.

Richard explains how, where, and why plumbing systems fail; Richard gives a deep dive on when and how plumbing pipes and connections can be repaired or replaced; Ross explains and demonstrates how to prevent plumbing failures with new technology.

In this special episode of Ask This Old House, Tom walks two homeowners through the entire process for building a two-level deck, starting with pulling permits and getting a land survey all the way through to installing the deck boards and railings.

In this episode, Tom explains the architecture, installation, and maintenance of white cedar shingles. Richard repairs a hose spigot, and Jenn builds and plants a self-watering vegetable garden.

Mark helps a 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.

In this episode, Richard helps a homeowner replace components of his pedestal sink, and Heath discusses bathroom vent fans. The team shares home inspection nightmares, and Tom explains how to clean dirty tile grout.

Kevin works with Jenn Largesse to demonstrate a technique on a trim router. Heath grounds an outlet, while Mauro explains paint rollers and demonstrates rolling techniques. Mark then replaces fireplace doors.

Ross tests out some new smart lighting configurations, while Tom helps a homeowner build a custom screen door. Richard gives general advice on maintaining a washing machine, and Mauro teaches a homeowner techniques to paint old 1960s wood trim with a varnish on it.

The Ask This Old House team travels to and appreciates different national parks and makes a few house calls.

Using a mobile CNC routing machine; building a dog dish stand using power tools; different methods for wiring a portable generator to a house.

Planting an indoor garden; the basics of using a hole saw; replacing a common terra cotta hearth with slate tile.

Richard replaces a shower valve with a conventional pressure balanced one, Nathan demonstrates how to refinish stair treads, and Tom removes moss from a roof in the latest episode of Ask This Old House.

Nathan tightens a railing; Mauro strips paint off hardware; Richard upgrades a thermostat.

Installing a ceiling light; installing the temperature rating system for ceiling lights; the uses for different types of trowels; building a tool storage shelf.

Building a hexagon planter; reviving a stoop; home inspection nightmares; installing an electric fireplace insert.

Restoring a beehive oven; failure points in toilet tanks and how to repair them; building a metal coat rack.

Replacing a stair railing; upgrading a door to make it look more modern; cleaning and painting vinyl shutters.

Indoor air quality; replacing polybutylene piping with conventional PEX; drop cloths; different methods for silencing a squeaky door.

Replacing a standard toggle switch with an antique push button switch; affordable geothermal heat pumps.

A women's only do-it-yourself class; selecting and installing plants for a terraced garden; how homeowners and contractors should communicate about expectations for home improvement projects.

Repairing an old dining room built-in with hand tools. Home inspection nightmares. Installing a chandelier in a dining room.

The uses and purposes for different types of screws. Installing a whole house ductless humidifier. Changes to electric bill payment structures. Installing a front entry planter.

Mark replaces a homeowner's sloppy fireplace surround with a clean, thin brick veneer.

Mauro paints a baby’s nursery using zero VOC paint. Richard tests out a new dryer that uses a heat pump to dry the clothes. Tom and Kevin build a record player stand out of oak plywood.

Nathan travels to Birmingham, Alabama to install a sliding barn door in an open-concept loft apartment. Tom compares the qualities of different types of roofing materials. Ross explains the culprit behind damaged solar panels and how to prevent future damage. Mark installs a dry well for a homeowner with drainage issues in his backyard.

Killing weeds without hurting the lawn; restoring a historic fireplace built with custom bricks; thermostats; hanging a swing.

Replacing split-level stair treads; pruners; shortening a gas pipe for a new stove.

Re-pointing a fieldstone foundation; water management on the outside of a house; the disposal of oily rags; smoothing over a textured ceiling.

Updating a water filter on a retro faucet; the uses for different types of masonry jointers; when and how to use a Japanese pull saw; re-caulking a bathtub.

Upgrading an irrigation system; home inspection nightmares; kitchen renovations; building an Adirondack-style outdoor chair with Jimmy DiResta.

Caring for prairie grasses; making a home more resistant to wildfires; a robotic solar array mimics a sunflower.

Repainting a rusty metal railing; innovations that make cleaning a clogged sink easier; building a wire rack out of a reclaimed beam.

Repairing a crack in a concrete retaining wall with a stucco finish; air compressors; installing a gas dryer.

Installing a vertical garden; uses for different drill bits; advances in toilet engineering that help save water.

Replacing a bifold closet door; alternatives to flower bouquets; painting a bathroom using a mold resistant paint.

Soft close kitchen cabinets; how gas regulators work; cleaning up an overgrown garden and redesigning it as a secret garden.

Protecting homes from earthquakes; staining concrete; why and how to change lo locks in a new home; rerouting a lengthy dryer vent.

Replacing a concrete walkway with brick pavers; installing gas piping in a home; building a farmhouse table; guest Jimmy DiResta

Building a swing set; building saw horses with materials left over from the job site; automated home construction.

Repairing and updating a fireplace surround; drip edges.

The team discusses tools that make good gifts; Jenn returns to her home state of Florida to help a homeowner design a tropical landscape for his backyard; former apprentice Nathan returns to help Tom change the swing of an entry door.

In Build It, Tom and Kevin build a modern storage bench out of a single sheet of MDF and then Mauro paints it; Richard travels to Seattle to help a homeowner whose shower runs cold whenever there’s a demand for hot water elsewhere in the house.

Tom installs crown molding on cabinets with full overlay doors; Richard discusses toilet seats; Mauro teaches apprentice Mary how to strip wallpaper without using any chemicals.

Richard travels to Akron, Ohio to install a garage heater; Tom teaches the basics of sanding; Ross installs a DIY security system; Mark investigates a strange issue happening to foundations in the Northeast.

Mark installs a front walkway for a homeowner using natural stone; Mauro explains the uses and techniques for different types of painter’s tape; Tom and Kevin build a headboard using rustic barnboard.

Mark explains how to make concrete; Tom replaces a broken pane in a basement window; in Future House, Ross travels to NASA Johnson Space Center to learn about the technology they use on the International Space Station to keep the astronauts alive.

Jenn installs a plunge pool for a homeowner with a small backyard; Tom gives some basic tips about insulating an attic; Richard travels to Celebration, Florida to help a homeowner select and install the right electric water heater.

Tom installs an alternative to a gutter when a traditional one does not work; Ross and Richard update Kevin on a Future House technology; Jenn heads to Phoenix to recreate the desert in a homeowner's front yard.

Mauro teaches a homeowner how to paint a metal door; Mark explains how to match mortar for repointing jobs; Tom teaches apprentice Austin how to make a variety of different wood joints by building simple utility boxes.

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.

Richard discusses the possible causes and solutions for a frozen air conditioner; Tom fixes an end cap on a stair railing that is loose; Ross travels to Napa to tour a house that's testing a variety of interconnected smart home devices.

Richard demonstrates a solution for replacing a water main shutoff; Jenn travels to Tennessee to build a planter out of an animal feeding trough; Mark waterproofs brick; Kevin heads back to Jimmy DiResta's shop to build a sign.

Mark installs a metal railing using anchoring cement; in Open House, Richard weighs the pros and cons of steam heat; Tom demonstrates the correct way to replace a cracked kitchen floor tile.

In this special episode of AskTOH, the guys head to Texas in the aftermath of Hurricane Harvey to profile nonprofits working to tear down, clean out, and rebuild homes that were destroyed during the storm.

Richard diagnoses and repairs a water system with air in it; in Open House, Tom analyzes a staircase that is not to code; Mauro makes his first house call to teach a homeowner the basics of painting a room.

Roger tends to a lawn that was seeded in the summer and is not doing well; Richard goes over low-budget kitchen upgrades; Tom travels to a futuristic workshop in San Francisco to build a stool using computer-based tools.

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 7 years ago; Tom shows closet storage options.

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.

Richard heads to Milwaukee to install an instantaneous water heater; Tom demonstrates some techniques for cutting straight edges with a circular saw; Mark rebuilds a retaining wall that was stacked with the wrong material.

Mark tests out different tools that collect silica dust more efficiently; Richard shims a wobbly toilet; Kevin heads to the Catskills to build a wooden slice table with Jimmy Diresta, a maker who's famous online for his how-to videos.