Ask This Old House - Season 23

Richard Trethewey and Nathan Gilbert assist a homeowner with a couple upgrades to make her bathroom better suited for aging in place; After being denied by gutter companies and local handymen, a homeowner's last hope is to call Tom Silva and Nathan to help replace her rotten wooden gutters.

Mauro Henrique demonstrates how to repair cracked drywall; the team tries to guess the correct use of Tom Silva's black inflatable square; Mark McCullough walks through the evolution of bricks; Richard Trethewey shows a homeowner two different types of covers to upgrade his radiator baseboards.

Jenn travels to Florida to assist a homeowner in choosing tropical trees for his backyard; Nathan demonstrates a tool that makes asphalt roof work easier; Ross showcases some smart light products.

Mason Mark McCullough helps a homeowner take care of a pitch issue on their granite front steps. After repairing the water damage, the two work together to replace the tread with perfect pitch.

Nathan installs a bathroom recessed cabinet; Mark repairs a chimney crown; Mark shares some items he's found while doing jobs.

Jenn solves a homeowner's gutter runoff problem by installing a dry well and popup emitter; Ask This Old House spotlights lead carpenter Lasana Harper; Heath helps a homeowner replace a ceiling fan.

Kevin teams up with a wallpaper expert to create an accent wall in Miami; Lee demonstrates a variety of sprinkler heads; Richard installs a submersible sump pump to solve a flooded basement problem.

Ross investigates an excessive dry air issue and installs a whole house humidifier; Mauro shares his technique for painting shutters in bulk; Tom and Kevin build a triangle outdoor end table.

Mark McCullough fixes an uneven paver patio that has lifted and shifted over time and demonstrates the proper techniques of creating a patio that will last; Nathan Gilbert and Kevin O'Connor talk all about common types of ladders including styles, accessories, and how to use them safely; Heath Eastman helps a homeowner cut her car charging time in half by installing a Level 2 EV charger.

Nathan Gilbert replaces a homeowner's broken double trash can pull out with a new one that will smoothly slide in and out from the cabinet space; Heath Eastman gives a brief history of household light bulbs and explains why incandescent and fluorescent lights are being phased out; Lee Gilliam helps a homeowner's curb appeal by removing overgrown arborvitae trees.

Mark McCullough travels to Detroit to help a homeowner make a gravel foundation for a shed; Tom Silva and Nathan Gilbert walk through the anatomy of framing an interior non-load bearing wall with a door opening and share their tips on how to build one; then Nathan helps a homeowner hide their laundry area by installing a partition wall with bifold double doors.

Richard Trethewey assists a homeowner through the process of converting a wood burning fireplace to gas, assembling a team to do the electrical, gas hookup, and insert installation; Tom Silva brings in a metal, pointy item for the crew to guess What Is It? Nathan Gilbert helps a homeowner install flat panel wainscoting in his dining room.

Jenn Nawada meets with a Detroit beekeeper and learns about bees, how honey is harvested, and tips on how to start your own hive; Ross Trethewey, Heath Eastman, and Lee Gilliam share a few phone apps they've been using in the field lately that has made their work easier; Tom Silva and Kevin O'Connor build a step stool using a mobile CNC router.

Mauro Henrique helps a homeowner paint his wainscoting by using an airless sprayer; Kevin O'Connor, Ross Trethewey, and Heath Eastman discuss how a growing number of homes are going all electric and how it compares with fossil fuels. They share what homeowners should research before making the switch; Nathan Gilbert helps two young brothers build a sandbox for their very own digging area.

Ross visits a company in Austin that is 3D printing homes; AskTOH spotlights a dedicated Detroit landscaper; Tom and Kevin turn a square bowl.

Mauro helps a homeowner paint his unfinished stair treads and handrail; the team shares a few new tools they've been using lately; Heath installs wall sconces above a fireplace.

The team builds an outdoor shower for a Cape Cod couple. Jenn and Mark focus on the layout and drainage; Nathan installs the enclosure; Richard makes the water hookup and installs the shower system.

Lee and an arborist diagnose a diseased pine tree; Lee sees how the treatment plan worked and learns about other fungal diseases; Nathan performs a new homeowner walkthrough checklist.

Richard demonstrates how to clean and maintain a mini split; the guys play What Is It; Mark and Jenn team up to help a homeowner upgrade her house's curb appeal by building a garden retaining wall.

Lee explains and demonstrates dethatching and aerating; Heath investigates a high electrical bill by installing a smart home energy monitoring system; Tom and Kevin go over the basics of routers.

Lee helps a homeowner add a new zone to her irrigation system; Richard weighs the pros and cons of PEX and copper; Nathan repairs a door hinge that's fallen out of the old, stripped screw holes.

Jenn travels to Detroit to learn about urban pollinator gardens and plants an herb garden; Tom demonstrates impact drivers versus power drills; Mark replaces a brick driveway apron with cobblestones.

Ross pinpoints the root causes of a home experiencing hot and cold spots and offers solutions; AskTOH spotlights metal fabricator, Shelby Barnhart; Mauro demonstrates how to remove shellac from wood.

Ross explains common ductwork noises and shares some solutions; Lee demonstrates how to fix a dead lawn by aerating and overseeding; Mark repairs cracked stucco over a concrete foundation.

A tribute to landscape contractor, Roger Cook. A man whose genuine kindness and passion for his craft was able to transcend the screen, making viewers feel like they were learning from an old friend.

Tom and Kevin build mudroom cubbies for storing coats, shoes and accessories; Mauro and Kevin then finish it off by painting the cubbies burgundy; Jenn goes over different types of mulch.