Season 23 - Ask This Old House

Ross Trethewey travels to Austin to visit a company that is building homes using 3D printing to learn about the process and how they differ from classic stick-built homes; AskTOH spotlights Aaron Smith, a dedicated landscaper in Detroit who is making a difference through community-focused and sustainable initiatives; Tom Silva and Kevin O'Connor use a lathe to turn a square bowl with legs.

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.

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.

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.

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.

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 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.

Ross Trethewey investigates a homeowner's excessive winter dry air issue and solves it by installing a whole house humidifier system; Mauro Henrique often has to paint up to 80 shutters at a time on a job, so he shares his technique for quickly painting shutters in bulk; In Build It, Tom Silva and Kevin O'Connor create a triangular top outdoor end table out of teak wood.

Kevin O'Connor teams up with wallpaper expert, Carmen Gonzalez, to help a Miami homeowner create a focal point wall with a grass cloth wallpaper; Lee Gilliam demonstrates a variety of common sprinkler heads and explains their different purposes; Richard Trethewey installs a submersible sump pump as a solution to a homeowner's flooded basement problem.

Jenn Nawada demonstrates two different solutions to solve a homeowner's gutter runoff problem by installing a dry well and a popup emitter; Ask This Old House spotlights lead carpenter Lasana Harper, who shares his journey into carpentry and how it has shaped his love for teaching; Heath Eastman helps a homeowner replace her 80's-tastic ceiling fan with a more modern option.

Nathan Gilbert transforms a homeowner's hanging bathroom medicine cabinet into a recessed medicine cabinet; Mark McCullough replaces a chimney crown that is causing water damage to a homeowner's indoor charcoal grill; Mark shows Kevin O'Connor some of the little pieces of history he's found while doing masonry work over the years.

Concrete, brick, and mortar are incredibly durable, but they’re no match for water. While on a house call, mason Mark McCullough realized the root of a homeowner's problems with their front steps was exactly that: water getting behind the stair tread, deteriorating the mortar and heaving the tread forward when it freezes. Luckily, Mark knew just what to do.