Season 4 - Ask This Old House Episodes

Richard installs a mini-split air conditioning system. The guys ask, "What is it?" Roger helps a homeowner "wake up the lawn" in preparation for spring by using a de-thatching machine.

Tile expert Joe Ferrante shows Kevin the proper way to cut several different types of tile. Tom installs a sump pump in a wet basement. Tom and Richard discuss emergency backup systems for sump pumps.

Richard helps a homeowner select and install a new dishwasher. The guys ask, "What is it?" Tom shows Kevin how to sharpen wood chisels using different types of sharpening stones. Roger and Kevin head outside for some lessons on proper use of lawn spreaders.

Tom Silva replaces an interior "hollow-core" door with a "solid-core" door. Tom and Kevin cut several doors in half to reveal how they’re constructed. Richard repairs a leaky kitchen faucet. Richard shows Kevin several types of kitchen faucets and a few tips on repairing them.

Richard shows Kevin how to repair damaged threads on a radiator. Roger solves a grading problem that is causing wood rot. The guys ask, "What is it?" Tom shows Kevin how to stabilize a wobbly newel post. Kevin helps a homeowner refinish her old cast-iron bathtub..

Richard installs an instantaneous water heater. Roger shows how proper planting of deciduous and evergreen trees can help reduce heating and cooling costs. Tom insulates the walls of a Victorian. Tom demonstrates how to add fiberglass insulation to an attic.

Roger and a specialist help a homeowner install a granite driveway marker. The guys ask, "What is it?" Richard fixes a hot water radiator that is not providing any heat.

Tom shows Kevin how to build a custom cover for a radiator. Richard shows Kevin several different types of humidifiers and makes a housecall to install a steam humidifier on a forced-air heating system.

Roger transplants a spruce tree that was originally planted too close to a house. The guys ask, "What is it?" Tom helps a homeowner extend a staircase handrail using a new type of fastening system.

Richard and a specialist repair a residential well system for a homeowner by replacing the pump and pressurized well tank. Tom helps a homeowner repair a small hole in his vinyl siding.

Tom shows Kevin several different types of hammers and how to use them. Richard repairs a pressure-assisted toilet. Tom then gives Kevin some lessons on how to patch a large hole in a wall using veneer plaster and blueboard.

Roger installs a low cost in-ground sprinkler system. The guys ask, "What is it?" Tom helps a homeowner pour new concrete footings for a backyard deck.

Kevin helps a pair of homeowners who have dangerous levels of radon gas in their basement. Kevin shows a number of radon test kits available. Roger shows a homeowner how to prune his apple tree to produce healthy fruit.

Tom installs a new vinyl floor. The guys ask, "What is it?" Richard shows Kevin a few ways to prevent plumbing pipes from freezing in the winter and the proper way to thaw frozen pipes.

Kevin meets with a local expert to learn about the proper tools techniques for window washing. The guys ask, "What is it?" Richard helps a pair of homeowners flush the sediment out of their aging electric water heater. Richard demonstrates water heater maintenance tips.

Roger and Kevin head outside for a few lessons on the different types of snowthrowers. The guys ask, "What is it?" Tom replaces an old, drafty exterior door with a new pre-hung, energy-efficient unit.

Roger helps a pair of homeowners tame an overgrown privet hedge with some "rejuvenation pruning." Richard helps a homeowner install a laundry sink. Together, they run the copper pipes for the water supply, make the new PVC drain connection, and connect the plumbing vent.

Richard shows how to use a common wire nut to save a partially-used tube of caulk. Tom Silva replaces the worn-out roof on an old garage by tearing off the old roof, laying down felt paper, and re-shingling the roof.

Tom gives Kevin a few lessons on the proper use of a circular saw. Richard installs a new outdoor faucet using flexible plastic tubing called PEX. The guys ask, "What is it?" Arborist Matt Foti prevents a tree from splitting in half with steel cables and through-bolts.

Tom Silva removes moss and lichen from his shade-covered roof. The guys ask, "What is it?" Richard shows Kevin how to repair a leaky valve. Roger plants shade-loving groundcover under a 100-year-old beech tree.

Roger builds a raised garden bed using composite landscape timbers. Roger shows host Kevin several other types of landscape timbers. Richard clears a slow-draining bathtub using a plumbing snake.

Roger helps a homeowner care for an ailing rose bush. The guys ask, "What is it?" Richard shows Kevin a number of ways to steady a wobbly toilet. Tom prevents water from leaking through a hole in the foundation into a basement.

Roger shows Kevin how to repair a flat wheelbarrow tire. Tom repairs an aluminum rain gutter. Kevin and Tom demonstrate a tip sent in from a viewer on how to drill a hole in ceramic tile. Richard Trethewey installs a thermal expansion tank.

Richard helps a homeowner improve the quality of her drinking water by installing an under-sink filter. Richard and Kevin are joined in the loft by water-filtration expert Bill McTighe. Roger Cook helps a homeowner plant a drought-resistant tree in her sloped front yard.

Tom quiets a homeowner’s squeaky stairs and replaces a broken baluster. The guys ask, "What is it?" Richard helps a homeowner prevent a damaging flood by installing an automatic shut-off valve for her washing machine.

Roger helps a homeowner repair a loose flagstone in his mortared front walkway. The guys ask, "What is it?" Tom helps a handy homeowner patch a hardwood floor where an interior wall once stood.