Roger heads to Florida to learn about citrus greening, a disease that's killing citrus trees across the state the guys ask What Is It? Tom replaces an old vinyl peel-and-stick floor with ceramic tile.
Richard shows Kevin some solutions for dealing with rust staining Tom opens up a small home by installing a pass through in a load-bearing wall Roger replaces a poorly built fence gate with one that will last NASA astronaut Rick Mastracchio.
Tom and Kevin help a homeowner install new cabinets Richard shows many options for countertops, including laminate, wood, engineered stone, and natural stone the Cleveland home and restaurant kitchens of chef Michael Symon provide inspiration.
Electrician Scott Caron replaces outdated fluorescent under-cabinet lights with new LED fixtures Roger and Kevin demonstrate how to work with concrete Richard teaches Tom about the potential energy savings of temperature setbacks on thermostats.
Roger and Jenn share tips for killing weeds Mark restores a damaged historic fireplace Richard and Ross discuss thermostat improvements Tom adds structure to a porch to safely hang a swing.
Tom replaces split-level stair treads in a mid-century modern home Jenn shares some tips about pruners Richard shortens a gas pipe for a stove that doesn't fit against the wall.
Mark repoints a crumbling fieldstone foundation Tom discusses proper disposal techniques for oily rags Mauro smooths over a textured ceiling using joint compound.
Richard updates a filter on a retro faucet Mark explains different masonry jointers Nathan explains when and how to use a Japanese pull saw Tom demonstrates how to re-caulk a bathtub.
Illegal fireworks cause a fire in the triple decker just before COVID-19 strikes contractors put the house back together.
Final touches are added to the triple decker.
Reinstalling the upper cabinets hot water and heating shopping for appliances tile installation and window trim.
General contractor Tom Silva helps a pair of homeowners install a new sliding glass door Tom, along with host Kevin O'Connor, landscaping contractor Roger Cook and plumbing and heating expert Richard Trethewey ask, What is it?
Landscaping contractor Roger Cook helps a homeowner prune an overgrown evergreen hedge Roger, Kevin O'Connor, Richard Trethewey, and Tom Silva ask What Is It? Tom helps a homeowner install a tile backsplash in his kitchen.
Replacing a corroded nipple fitting on a water heater Tom helps a homeowner install a vented range hood in her kitchen he cuts a hole in the exterior wall, installs a mounting block, hangs the exhaust fan above the stove and connects the ductwork.
Tom and Kevin build a simple table from solid fir normally used for building decks, and Kevin works with a wood finishing expert to stain and finish it how to get rid of tree stumps using a gas-powered stump grinder the state of solar energy.
In this special program, the guys celebrate 300 episodes of "Ask This Old House" by looking back at some of their best moments and revealing some behind-the-scenes secrets.
Richard helps a homeowner replace a shower valve that mysteriously shuts off Tom shows how to patch a hole in baseboard Roger shares some tips for maintaining a lawn mower.
Roger helps a homeowner plant a low-cost, low-maintenance privacy screen using arborvitae, fastigiate white pine, lilac, and more Tommy demonstrates many uses for a speed square Richard uses new technology to seal ductwork from the inside.
Roger shows Kevin how to start plants from seed Richard replaces an outdoor hose spigot with one that will never freeze Tom builds a moveable kitchen island with Kevin.
Jenn upgrades an irrigation system the team looks at Home Inspection Nightmares Tom discusses kitchen renovations Kevin builds an Adirondack-style outdoor chair with Jimmy DiResta.