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Replacing a shower valve with a conventional pressure balanced one; refinishing stair treads; removing moss from a roof.

Ask This Old House

Weird Shower Valve; Mossy Roof

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

Ceiling Light; Tool Storage

Kevin O'Connor works with maker Jenn Largesse; Jenn Nawada revives a stoop; Heath Eastman adds a fireplace insert.

Stoop; Planters; Fireplace Insert

Mark explains the history and function of Colonial-era beehive ovens and restores one in a house built in 1750; Richard explains the failure points in toilet tanks and how to repair them; Jimmy DiResta invites Tom to his shop for a welding lesson.

Beehive Oven; Jimmy DiResta

Replacing a traditional stair railing with more modern cable railing; why standard PVC should not be used to vent gas appliances and what should be used instead; upgrading a standard, flat panel hollow core door to look more modern.

Cable Railing; Painting Shutters

Ross and Richard discuss indoor air quality; Richard helps a homeowner replace her polybutylene piping with conventional PEX; home inspection nightmares; selecting drop cloths; Tom explains different methods for silencing a squeaky door.

Polybutylene; Squeaky Door

Replacing a standard toggle switch with a reproduction antique push button switch to match the rest of the house; in Albany, N.Y., Ross explores ways to make drilling for and installing geothermal heat pumps more affordable for average homeowners.

Switch; Affordable Geothermal

Tom checks out a women-only DIY class; Jenn helps a homeowner select, place, and install plants for her terraced garden; the ways homeowners and contractors should communicate to set appropriate expectations for home improvement projects.

Women's Repair Class; Garden

Tom repairs an old dining room built-in with hand tools and a bar of soap; the team shares more home inspection nightmares; Heath Eastman makes his first house call to install a chandelier in a homeowner's dining room.

Built-in; Dining Room Light

Tom explains the uses of different types of screws; Richard travels to Park City, Utah to install a whole house ductless humidifier; Ross and Richard discuss changes to electric bill payment structures; Jenn installs a planter for a homeowner.

Ductless Humidifier; Planters

Planting a small herb garden with a cocktail theme; a homeowner's radiator sprung away from the pipe when he tried to replace the valve, so Richard heads to his house to help him reconnect it; Mark replaces a homeowner's sloppy fireplace surround.

Radiator; Fireplace Veneer

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General contractor Tom Silva, heating and plumbing master Richard Trethewey and landscaper Roger Cook join host Kevin O'Connor; they assist homeowners with some of their most difficult home improvement challenges.

S18 E4 | Ductless Humidifier; Planters