The decision
Four questions, in order
A box gutter, the trough built into a rowhouse cornice, can be patched, relined with membrane or metal, rebuilt, or converted to a hanging gutter. Answering these four questions in order narrows it down quickly. The box gutter repair page explains how the gutters work and how they fail.
- 1. Is the wood trough sound?Yes: a patch or reline is on the table.No: the trough has to be rebuilt, or the gutter converted to a hanging one.
- 2. Is the house in a historic district?Yes: relining keeps the street view the same; converting changes the cornice line and gets closer review.No: conversion is simpler to approve, though it still changes the look of the row.
- 3. How long will the owner keep the house?Many years: a longer-lasting lining, such as metal, spreads its cost over more time.A few years: a membrane reline or a careful patch may be the better value.
- 4. Does matching original material matter?Yes: copper or lead-coated copper matches original work.No: a membrane reline does the job at a fraction of the cost.
Up front and over time
What each choice costs
| Option | Up-front cost (national) | How long it lasts |
|---|---|---|
| Patch | $20–$50 per foot of repair | Short term; buys time on a lining that is otherwise sound |
| Membrane reline (EPDM/epoxy) | $900–$1,900 per job | Varies with detailing at the outlet and ends, and with exposure |
| Metal reline | $8,000 or more | Copper: 75 to 100 years or more |
| Rebuild the trough | $40–$180 per foot | Depends on the new lining chosen |
| Convert to hanging gutters | $1,500–$5,000 or more | That of the new hanging gutter; the old trough is closed off |
All figures from Modernize's box gutter guide, national. No source gives a reliable life span for membrane relines, so none is stated here.
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The case for each
When each option makes sense
Patch
One or two failed seams on a lining that is otherwise in good shape. A soldered or properly bonded patch is a real repair; roofing cement smeared over a crack is not, and it makes a later reline harder.
Membrane reline
The most common choice on Jersey City rowhouses: the old lining comes out and a membrane goes in, turned up under the roof edge and over the front lip. It keeps the cornice looking the same from the street and costs a fraction of metal.
Metal reline
For owners who want the longest-lasting lining or need to match original copper. The up-front cost is the highest, but a copper lining can outlast several membranes.
Convert to hanging gutters
When the cornice wood has rotted beyond repair, or the owner wants a system that is simpler to maintain. It closes off the old trough and hangs a new gutter at the edge, which changes how the cornice reads from the street.
Urgency
Can it wait until spring?
Some box-gutter problems can be scheduled; others get worse with every storm because the water is going into the wall.
| Sign | Usually means | Timing |
|---|---|---|
| A drip from the cornice face in heavy rain only | A seam or end starting to fail | Plan the repair; a temporary fix may hold |
| Peeling paint on the cornice soffit | Water has been in the wood for a while | Get it looked at before the next wet season |
| A new ceiling stain near the front wall | Water is reaching the interior | Sooner rather than later |
| Soft or crumbling wood on the cornice | Rot in the trough or brackets | Urgent; the fix may now be a rebuild |
| Plants growing from the cornice line | Standing water and debris in the trough | Clear it now; inspect the lining |
On the day
What a reline involves
- Access from the roof, usually through a hatch, or from scaffolding on taller fronts.
- The old lining comes out, along with layers of past patching.
- The wood is inspected. Soft sections are cut out and replaced, which is where prices can change.
- The new lining goes in, turned up under the roof edge and over the front lip, and sealed or soldered at the outlet and ends.
- The outlet and conductor head are checked so the new lining drains freely into the leader.
- A water test confirms the trough drains with nothing standing.
Historic blocks
The street view decides a lot
In Jersey City's five historic districts, work needs approval before it begins. Relining usually leaves the cornice looking the same and is the kind of repair handled at staff level. Converting changes the cornice line, which is what review exists to look at. The historic districts page explains the process and what to bring to staff.
Talking to a contractor
Questions that separate good box-gutter quotes
- Will someone inspect the trough from the roof before giving a final price?
- What happens to the price if rot turns up once the old lining is out?
- How will the outlet into the conductor head be detailed?
- How are the ends and the joint at a neighbor's house handled?
- Will there be photos before, during and after?
- Who handles historic-district approval, if it applies?
Full prices for every option, plus leaders and guards, are in what gutters cost in Jersey City.