Ask This Old House S24E21: Running Power to a Shed, Mauro's Painting Kit, and Compost or Dispose It

Season 24, Episode 21 gives us three segments that share a quiet theme: the parts you don't see. Heath Eastman buries a feeder cable under a lawn and then tells you where he buried it. Mauro Henrique lays out a paint kit and spends most of the time on drop cloths and plastic sheeting. And Kevin O'Connor, Richard Trethewey, and Jenn Nawada play a kitchen-waste quiz where the right answer depends on what happens inside the drain after you walk away. Nobody in this episode is showing off a finish. They're all talking about what's underneath it.

Heath Eastman Runs Power to Jeff's Shed

Jeff has a new shed in the yard, and one half of it is going to be a workshop. He wants light, a place to charge batteries, and enough juice for the tools he hasn't bought yet. Heath Eastman's answer is a subpanel rather than a single circuit, and he says why: room for growth. If the shop half becomes an actual woodshop later, the panel is already there.

The path is the interesting part. Jeff walks Heath through the house side and it's not simple. The back door leads to a crawl space that's blocked off, so the run has to go to a corner of the basement instead. Outside, the entry point lands between an old coal chute and a window, because plumbing stacks are in the way of everything else. Heath picks the run on the far side of a joist so the PVC doesn't tangle with the drain pipes running upstairs. On an old house, this is the whole job. The digging is the easy half.

Trench, sand, and the bell end rule

Ryan, brought in to dig, gets a fairly straight shot from the house to the shed in a yard Heath calls nice and flat. The target is roughly two feet deep, with 18 inches of cover at the top of the pipe and a few inches of sand underneath it. Heath asks for the sand because rocks in the backfill can work their way up through frost movement, and the sand bed gives the conduit something forgiving to sit in. Sand goes over the pipe, too, before the soil does.

Jeff asks a good question during the conduit layout: why did Heath have him set the bell ends facing the shed instead of the house? Because the yard pitches away from the house. Water that gets into the run should travel around the bell, not into the glued joint. If you laid it the other direction, water running downhill would sit against the seam where the glue has to be perfect. It's the kind of orientation decision that costs nothing at layout and a lot later.

At the shed wall, Heath sets an LB fitting where the wires come up and turn in, plus an expansion fitting above grade. Frost heaves move the ground, and the expansion fitting lets the conduit move up and down without pulling the wire or tearing the pipe out of the building. He mentions you can paint the fitting to match the shed. Small thing. Also the kind of small thing that decides whether a homeowner resents the conduit forever.

Two ground rods, one unbroken wire, and tape that talks

Two eight-foot ground rods go in about six feet apart, connected with bare No. 6 wire that Heath deliberately does not cut. He slides the connector down so the run stays continuous from rod to rod to panel. Then, with the trench backfilled to about six inches below grade, he has Jeff walk out a metallic caution tape directly over the conduit before the final grade goes on. Hit the tape while digging for a shrub later, and you know there's a line below. The metallic version is traceable with a toner if you ever need to find the run precisely.

Inside, Heath finds a main panel that's busy and not rated for tandem breakers. Instead of forcing it, he asks Jeff what he can give up. Jeff offers the receptacles on an old workbench he won't use anymore, which frees two spaces for a two-pole 60-amp breaker. That's a real conversation to have with an electrician before anyone buys parts.

The conduit is intentionally oversized for the wire being pulled, which makes the pull easier and leaves room later. Heath uses fish tape, a pull line, a couple of hitches around the conductors, and tape smoothed over the nose so nothing catches an edge in the pipe. The wire tie-in at the main panel is left to a licensed electrician with the service disconnected, and the show says so plainly. That's not a disclaimer. That's the job.

The shed itself gets one receptacle and one light, the minimum Heath names for an outbuilding, plus an eight-foot LED overhead, an exterior light over the door, and a spot for a possible fridge. Heath adds that everything past the panel is the fun part. He's not wrong.

Heath's previous appearance this season was swapping battery detectors for interconnected hardwired smoke and CO alarms (S24E18), and the through-line holds: this is a guy who cares about what you can't see after the drywall or the sod goes back. A buried feeder is the same discipline with more shoveling.

Mauro Henrique's Painting Kit: What Actually Earns Space

This segment is a cart audit, not a tutorial. Kevin holds up the tools, Mauro explains why each one survives in his truck, and the answers are more opinionated than you'd expect.

He starts with protection, which tells you where his priorities sit. Canvas drop cloths on the floors. Taped plastic sheeting for walls, the kind with the tape already attached. A separate plastic for covering furniture. Kevin says canvas on the floor, never plastic, and Mauro agrees immediately: plastic on a floor is slippery. If you've ever stepped off a ladder onto a sheet of 4-mil, you already know.

Rollers come next. Nine-inch roller, 3/8-inch nap for smooth interior surfaces. A 3/4-inch nap for textured walls or a popcorn ceiling, where the longer fibers carry more paint into the dips. Kevin asks the question a lot of homeowners are too polite to ask, and Mauro explains nap as fluffiness, which is about as plain as that gets. The tray has a well and a grid so the roller sheds excess before it hits the wall.

Small tapered brushes handle cutting in against trim, and Mauro points out the magnetic holder that sticks to the ferrule so the brush stays on the tray instead of in the bucket. His extension pole telescopes for ceilings and high walls. And his multi-tool is a 17-in-1, not the classic 5-in-1. Big round end for cleaning rollers, small end for mini rollers, plus nail pullers and scrapers. Kevin points out that particular tool lives on Mauro's hip. Mauro does not deny it.

This is the painting counterpart to the nursery repaint and arched accent wall from S24E19. Same presenter, different layer of the job. One shows the technique, this one shows what's in the truck before the technique starts.

Compost or Dispose It

Kevin hosts a game show called Compost or Dispose It, with Richard Trethewey and Jenn Nawada as contestants and sound effects doing most of the comedy. Disposal growl for one answer, cow moo for the other. The format is silly. The plumbing underneath it is not.

Chicken meat and bones lose both rounds. Richard won't put it in the disposer because of the skin and bone, and Jenn points out you shouldn't give a dog cooked bones, which is correct and worth remembering. Banana peels and celery are rejected for the disposer because stringy material wraps around the blades. Jenn compares it to hair tangling, which is a fair analogy and probably why plumbers hate both. Coffee grounds are the sneaky one. Richard says the problem isn't the disposer, it's the drain: grounds can re-coagulate downstream and clog a pipe nobody can reach.

Ice cubes aren't compost, and Richard treats the old blade-sharpening claim as folklore, though a cube or two in the disposer gets a shrug. Pistachio shells get a pun and a firm no from both. Eggshells go to Jenn's compost pile, and Richard calls the no-eggshells-in-the-disposer rule a bit of a wives' tale, noting they're fragile enough to wash through. Lemons split the vote: compost for Jenn, a wedge into the disposer for Richard, who uses it to freshen a chamber that can get sour.

The natural predecessor here is Richard's garbage disposal install with an air switch back in S24E15, where he drilled through granite and let the empty unit growl on camera. Same appliance, same presenter, different question. There he showed what a disposal is made of. Here he shows what it isn't built to eat.

DIY Confidence Scale

Running power to a shed: 3/10. The conduit gluing and the LB fitting are approachable. Dig Safe, trench depth, ground rods, feeder sizing, and the main-panel tie-in are not, and the panel connection in particular should be a licensed electrician's work with the service off. Watch this one, take notes, then call someone.

Assembling Mauro's paint kit: 7/10. Buying the right roller nap and taping plastic to a wall is genuinely a homeowner job. Knowing which brush to reach for at a trim line takes practice. The tools don't make you fast. Repetition does.

Keeping coffee grounds out of the drain: 9/10. You have to remember not to do it. That's the entire difficulty level, and it's still where most people fail.

Additional Resources

• Watch on PBS
• Official This Old House episode page

The thing that stays with me is the caution tape. A homeowner pays for a trench they'll never see, a conduit they'll never see, and sand they'll never see, and then the one visible-for-a-moment product is a strip of foil-backed plastic that exists purely to protect the next person who digs. If you've had a line run to an outbuilding, did anyone bother to leave you a map?