Season 23, Episode 21 of Ask This Old House focuses on three ordinary problems that can quietly waste water, money, and patience: extending irrigation to new planters, choosing between PEX and copper plumbing, and repairing a door hinge whose screws no longer grip. Landscape contractor Lee Gilliam, plumbing expert Richard Trethewey, host Kevin O’Connor, and carpenter Nathan Gilbert turn those headaches into practical lessons. The episode aired in April 2025 and runs just under 24 minutes.
The projects share one idea: a durable repair requires understanding the system around the failed part. A planter should not be connected to the nearest pipe without checking pressure and scheduling. Plumbing should not be selected by habit alone. A loose hinge will not recover because the same tired screw is tightened for the ninth time.
Why the Irrigation Add-On Is More Than Extra Tubing
The first project takes Lee to Austin, Texas, where a homeowner has added planters behind a deck. The existing sprinkler system serves the yard, but the containers need controlled watering. Lee and a local irrigation professional install a separate drip zone using pressure-regulated hardware and closely spaced emitter tubing. The episode lists a 40-psi drip control zone kit, quarter-inch emitter tubing with six-inch spacing, large planters, amended soil, compost, and Tangerine Beauty crossvine among the materials.
Why Drip Irrigation Suits Planters
Spray heads throw water across an area, which can be awkward around containers. Water may hit decking, walls, or pavement while roots receive an uneven share. Microirrigation works at low pressure and low flow, applying water slowly near the root zone. The U.S. Environmental Protection Agency says properly designed microirrigation can use 20% to 50% less water than conventional sprinklers while reducing runoff and evaporation.
Austin Water recommends drip irrigation for beds, shrubs, and trees because it targets roots. Local schedules still apply. As of July 2026, Austin’s published conservation rules assign watering days and restrict daytime operation, with different allowances for automatic systems and drip or hose-end methods. Homeowners should confirm current rules before programming a controller because drought stages can change.
Components That Make a Drip Zone Reliable
A permanent drip zone commonly includes backflow protection where required, a control valve, filtration, a pressure regulator, distribution tubing, emitters, flush points, and a compatible controller. Colorado State University Extension places the backflow device, valve, filter, and regulator in a logical sequence. Utah State University Extension also stresses matching the regulator to the pressure rating of the emitters.
Filtration matters because emitter passages are tiny. Sediment that passes through a lawn sprinkler can clog a drip outlet and leave one plant dry while its neighbor enjoys a private spa. Pressure control is just as important: excessive pressure can dislodge fittings, while low pressure can produce inconsistent flow. Seasonal maintenance should include checking for leaks, clogged or missing emitters, pinched tubing, and damage from tools or animals.
A Practical Sequence for Adding a New Zone
- Map the planting area. Note planter size, plant type, sun exposure, elevation, and distance from the valve manifold.
- Check capacity. Confirm that the controller has an open station and the supply can serve the proposed zone.
- Use compatible drip parts. Select the valve, filter, regulator, tubing, and emitters as one system rather than a plumbing junk drawer.
- Separate different water needs. Sunny containers and shaded beds may require different schedules.
- Flush the tubing. Run water through open ends before installing caps.
- Test every outlet. Look for weak flow, leaks, runoff, and drainage beneath planters.
- Program conservatively. Check moisture below the surface and adjust for weather, plant establishment, and local rules.
Smart controllers can improve scheduling, but they cannot correct poor installation. WaterSense-labeled controllers use weather or soil conditions to reduce unnecessary watering. They still cannot unclog an emitter or spot a tube cut by a shovel, so regular inspection remains essential.
PEX vs. Copper: A Practical Plumbing Comparison
Richard and Kevin compare PEX and copper water-supply piping without declaring a universal winner. Copper is rigid, familiar, durable, resistant to ultraviolet exposure, and useful where a stable stub-out is needed. PEX is flexible, easier to route through framing, resistant to corrosion and scale, and able to reduce the number of fittings in a long run.
| Factor | PEX | Copper |
|---|---|---|
| Installation | Bends around many obstacles and often needs fewer fittings | Requires measured cuts and fittings at turns |
| Joining | Crimp, clamp, expansion, or approved push fittings | Soldered, pressed, compression, or approved push fittings |
| Heat and UV | Must be protected from prolonged sunlight and excessive heat | Better suited to exposed or high-heat transitions when specified correctly |
| Corrosion | Does not pit or corrode like metal | Long-lasting in suitable water chemistry but can corrode under some conditions |
| Rigidity | Needs support and may use rigid fixture stub-outs | Naturally rigid in exposed mechanical areas |
| End of Life | Lightweight to transport | Highly recyclable and retains material value |
Where PEX Often Wins
PEX is attractive in retrofits, manifold systems, and long runs through joists or stud bays. Its flexibility can reduce joints and potential leak points. The Plastics Pipe Institute notes that efficient PEX layouts and smaller branch lines may also shorten the wait for hot water. Connections can be made without an open flamean obvious benefit in tight framing cavities where a torch can turn a modest repair into a call to the fire department.
Where Copper Remains Useful
Copper performs well near high-heat equipment, in exposed utility spaces, and at rigid fixture connections. It is not vulnerable to ultraviolet damage or chewing in the same way polymer tubing can be, and it is fully recyclable. The episode presents a sensible hybrid approach: use PEX for concealed distribution and copper where exposure, heat, or rigidity calls for it.
Local code, water chemistry, manufacturer instructions, fire-stopping rules, and approved fittings should guide the final design. Concealed piping, water heaters, boilers, service lines, or work requiring inspection are good reasons to involve a licensed plumber.
How the Stripped-Hole Repair Restores a Door Hinge
The final project addresses a loose hinge on an older, heavy door. Repeated movement has enlarged the screw holes until the threads no longer bite. Nathan considers longer screws, commercial inserts, toothpicks, and small plugs, then chooses a durable dowel-and-epoxy repair. He drills the damaged holes to a consistent quarter-inch diameter, removes dust, coats short dowels with two-part epoxy, inserts them, waits for the cure, trims them flush, drills centered pilot holes, and installs longer screws.
Why Tightening the Same Screw Fails
A wood screw holds because its threads engage sound fibers. Once those fibers are crushed or torn away, harder turning usually removes more wood. Toothpicks and glue can work for light-duty damage, but a heavy entry door places considerable leverage on the top hinge. Replacing the damaged area with a full dowel provides a more predictable block of new wood.
Dowel-and-Epoxy Repair Steps
- Support the door with shims or a door jack so the hinge is unloaded.
- Move the hinge leaf aside and mark the screw locations.
- Drill each damaged hole uniformly, keeping the drill square and avoiding unnecessary depth into the framing.
- Vacuum the dust so the adhesive contacts clean material.
- Dry-fit hardwood dowels, then coat and install them with two-part epoxy.
- Allow a full cure. “Mostly hard” is the adhesive equivalent of “the ladder seems stable.”
- Trim and sand flush so the hinge sits flat in its mortise.
- Drill centered pilot holes with a self-centering hinge bit.
- Install suitable screws by hand and stop when the hinge is snug.
Screw-head shape matters. A head that sits above the hinge leaf can bind when the door closes. Nathan uses longer brass slotted screws that visually match the old hinge, but cautions against choosing an oversized head merely to gain length. Fine Homebuilding also recommends self-centering bits because even a small off-center pilot hole can shift hinge alignment.
The Shared Lesson: Diagnose Pressure, Load, and Alignment
The three projects follow the same engineering logic. An emitter needs clean water at controlled pressure. A supply line needs the right material, joining method, support, and environment. A hinge screw needs sound wood, a centered pilot hole, and enough depth to resist the door’s load. The visible failure is only the final link.
- What force is acting? Water pressure, heat, gravity, vibration, or repeated impact?
- What material receives it? Polymer tubing, copper, jamb wood, framing, or planter soil?
- What failed first? A clogged emitter, poor fitting, unsupported line, stripped hole, or bad schedule?
- Can the repair be maintained? Will it remain accessible for inspection, flushing, tightening, or replacement?
Real-World Experiences and Practical Lessons
The Irrigation Branch That Waters Everything Except the Plant
A familiar weekend project starts by tapping into the nearest spray line. Water reaches the planter, everyone celebrates, and the tools go back into the garage. Two weeks later, one container is soaked, another is dry, and the deck has a clean stripe where overspray lands. The experience teaches that visible water is not controlled irrigation. A dedicated drip zone provides appropriate pressure, filtration, scheduling, and flow while allowing the planters to be tested separately from the lawn.
The Smart Controller and the Not-So-Smart Shovel
A weather-based controller can adjust run times, but it cannot see a punctured tube under mulch. A landscaper, pet, or shovel may move or damage a line while the controller continues operating with impressive confidence. Walk each active zone several times per season. Watch the emitters, inspect fittings, feel the soil below the surface, and compare plants at opposite ends of the line. Technology manages timing; it is less talented at noticing that a squirrel has redesigned the distribution network.
Choosing Pipe by Route Instead of Loyalty
A bathroom remodel may include an open basement ceiling, a tight wall cavity, a rigid shower valve, and an existing copper trunk. An all-or-nothing decision creates unnecessary work. PEX may suit the long concealed run because it bends around obstacles with fewer joints. Copper may be better at the valve or exposed stub-out because it remains straight. A properly designed mixed system is not a compromise; it is often the most logical use of both materials.
The Hinge That Has Already Been “Fixed” Five Times
Older doors often contain toothpicks, matchsticks, random screws, and layers of glue from earlier repairs. A new screw may hold briefly, but a heavy door soon pulls the top hinge loose again because the damaged wood was never rebuilt. The dowel method replaces that weak area with sound material. Supporting the door during drilling matters too; otherwise the hinge shifts and the repaired door may still sag even when every screw feels tight.
Small Finishing Details Prevent Repeat Failures
The last steps often determine durability. Flushing irrigation tubing removes debris before it reaches emitters. Supporting PEX prevents rubbing and movement. Protecting nearby material during copper work reduces fire risk. A self-centering bit keeps hinge holes aligned. Lubricating a brass screw reduces driving resistance, while hand-tightening helps prevent snapping or stripping. These details are not glamorous, but they separate a repair from its sequel.
Conclusion
“S23 E21: Irrigation Add-On, Stripped Holes” shows that efficient watering depends on zoning, filtration, pressure control, scheduling, and local rules. It explains why PEX and copper are materials with different strengths rather than rival teams demanding lifelong loyalty. It also proves that a loose hinge becomes reliable only after damaged wood is rebuilt and the new screw is centered correctly.
The best takeaway is simple: do not repair only what you can see. Trace the pressure, load, material, and alignment behind the problem. A few extra minutes of diagnosis can prevent years of leaks, loose hardware, thirsty plants, and vocabulary unsuitable for a family-friendly home-improvement show.
Note: Irrigation backflow requirements, plumbing codes, and permit rules vary by location. Confirm current local requirements and use a qualified professional when work involves potable-water protection, concealed supply lines, or regulated connections.
