Lee troubleshoots why a backyard won't grow grass and installs a shade-tolerant sod; Ross shares what to consider before converting to heat pumps; Kevin and maker Sarah Nadarajah build a side table.

Nathan installs a shade sail for a sunny pool area; Ask This Old House spotlights the brothers of a landscaping company in the Atlanta area; Mark makes a cost-effective concrete walkway repair.

The Ask team explores how homeowners can protect their houses against wildfires. Jenn learns about firescaping, Tom fire hardens a home, and Richard learns a weeding method to lower fire spreading.

Lee cleans up a backyard by removing invasive plants; Mark discusses chimney caps and how to know if you need one; Richard installs a bidet toilet and shares what bidet options are available.

Mauro discusses how he sees color and some of his favorite colors; Then, he paints over an offices wood paneling; Lee discusses shrub pruning tools; Nathan travels to Portland to build a mud kitchen.

Heath shares his tips and tools homeowners can use to identify and label home circuit breakers; Tom discusses his hobby of lathe turning; Then, in Build It he turns a segmented bowl.

Richard helps a homeowner troubleshoot why her shower quickly runs out of hot water; Kevin heads to Upstate New York to meet with maker Jimmy DiResta and learns how to make a leather tote bag.

Nathan shares his love of flea markets; Mauro cleans up a garage by painting over graffiti; Ross shares the importance of radon testing; Nathan helps ready a nursery by installing closet shelving.

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

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.

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.

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; Mark fixes a faulty brick lintel repair on an 1833 home.

Nathan heads to Tulsa, Oklahoma to build a replacement utility cover. Ross discusses low level carbon monoxide exposure. Mark helps a homeowner clean out creosote build-up in their kitchen fireplace.

Ask This Old House celebrates landscape contractor, Lee Gilliam and welcomes him to the cast; Richard helps a homeowner repair a leaking shower valve; Lee and Jenn refresh an eroding sloped yard.

Heath helps a homeowner install string lights over a patio; Mauro color matches a retro aqua kitchen cabinet and repaints it. Mauro goes to Home Depot to demonstration the color matching process.

Nathan recounts his time as a Boy Scout; Tom and Kevin build a hexagon herb planter; Jenn shows materials needed to build a raised planter; Jenn and Nathan rebuild a Girl Scout troop's garden beds.