Sprinkler head replacement: leaking heads, costs, and what not to do.

Somewhere in Maryland right now a townhome ceiling has a sprinkler head with a bead of water hanging off it, and an owner deciding it can probably wait. It cannot. A weeping head is a head partway through failing, and the difference between catching it this week and ignoring it for a season is the difference between a quick service call and a soaked ceiling with a story attached. This is what is actually going on and what fixing it involves.

Why heads leak

A residential sprinkler head is a sealed valve held shut by a heat-sensitive element. Four things defeat that seal in practice. Corrosion, the slow one, especially in humid spaces and near the bay. Mechanical damage, the fast one: a ladder, a moving box, a curtain rod hung from the wrong thing. Paint, the sneaky one, because a painted head is compromised even when it looks fine and painters tape over heads far less often than they should. And age, which in Prince George’s and other early-mandate counties includes a specific problem: 1990s-era heads recalled nationally and never exchanged, covered in our recall guide.

What to do the moment you see a drip

Close the sprinkler control valve, the labeled one with the gauge near where the water service enters, and leave your domestic water on; the two are separate. Put a bucket under the head, and call. What you should not do, ever, is cap, plug, tape, or unscrew a head yourself. A capped head is a room with no fire protection and a pressurized line rigged to fail, and it will not pass the next inspection or resale check.

What replacement involves and costs

For a licensed crew this is routine: system drained down, the failed head swapped for one matching its temperature rating and coverage, system re-pressurized, and the gauge verified. It is typically a single visit, usually inside a week of the call, and it sits at the small end of everything on our cost page, an order of magnitude below what the insurance claim for a let-go head runs. The repair ends with documentation, which matters in resale-minded markets like Howard and Anne Arundel.

The five-minute prevention routine

Glance at the gauge monthly. Keep paint and hangers off heads, and tell every painter and mover the heads are off limits. Keep tall storage away from garage runs. And if your system has never been looked at by a professional, an annual inspection costs less than the deductible you are risking without it. Heads are the cheapest part of the system and the most common failure point; treating them that way is most of the game.