Built-In Box Gutters on Older Omaha Homes

Stand across the street and study the roof edge. A hanging gutter shows as a separate trough fastened to the fascia. A built-in gutter does not show at all, or appears only as a thick, molded cornice with the shingles stopping short of its outer edge. Downspouts that start from under the cornice rather than from a visible trough are another giveaway.

Omaha has plenty of houses old enough to have them. About 17.8 percent of homes in the city were built in 1939 or earlier. Dundee filled in with Colonial, Georgian and Tudor Revival houses after 1905, and the Gold Coast blocks of the Cathedral neighborhood hold Colonial Revival, Tudor Revival and Queen Anne homes built from the 1880s into the 1940s. Hanscom Park is one of the oldest residential subdivisions in the city, and Field Club listings include houses from 1910 and 1913.

You may hear these called Yankee gutters, built-ins or cornice gutters. Some are true boxes behind a decorative crown molding, and some are metal-lined channels set on the roof just above the eave. Both work the same way and fail the same way.

A carpenter framed a trough into the rafter tails and sloped it toward the outlets. A tinsmith then lined it with sheet metal, usually terne-coated steel or tin, and sometimes copper on the better houses. The liner ran up under the roofing on the back side and over the outer lip on the front, and outlets dropped through the floor of the box into the downspout, sometimes by way of a conductor head.

Done right, the design is excellent. The gutter is large, it is hidden in the trim, and it cannot pull away from the house. The weakness is that every leak drains straight into the structure. A hanging gutter that leaks drips on the lawn. A built-in gutter that leaks drips into the cornice, the top of the wall and sometimes the plaster of an upstairs room.

Old liners rarely give out all at once. They fail at seams, at outlets and in low spots where water stood for years. The usual sequence goes something like this.

• Paint on a terne or tin liner wears thin and rust pinholes open in the low spots.
• Soldered seams crack after years of expansion and contraction.
• Past repairs with roofing tar trap water and hide rot under the patch.
• Water reaches the wooden trough, which softens and sags and holds even more water.
• Ice packs the box in winter and lifts the liner or splits a seam.
• Stains show up on the soffit, the frieze board or a ceiling below the eave.

A built-in gutter sits at the eave, the coldest part of the roof, and it holds more snow and water than a hanging trough. January in Omaha averages a low of about 14.5 degrees, and the city averages about 27 inches of snow a year. Nebraska is also seeing fewer days below freezing and more multi-day winter thaws, which means more melt and refreeze cycles inside the box.

Each cycle lets meltwater pool, freeze and expand against the liner. Where an outlet is partly blocked, the box can fill with ice from end to end, and that pressure is what opens old seams. Our guide to ice dams and gutters covers the roof side of the same problem.

By the time a stain shows indoors, the wood under the liner has usually been wet for a while. Treat any soffit stain under a built-in gutter as a reason to open it up and look, not a reason to repaint.

There are four realistic paths. Which one fits depends on how far the rot has gone, how much the look of the cornice matters to you and what you want to spend.

Whatever liner goes in, rotted wood beneath it has to come out first. A new liner laid over a soft trough sags, ponds water and fails early. Expect the final price to depend on what turns up once the old liner is pulled back. Our page on box gutter repair explains how a cornice gets opened and assessed.

Some owners want the hidden leak risk gone for good. A conversion closes off the box, carries the roofing over it and hangs a gutter on the new edge. On a plain cornice a standard K-style can look fine. On a detailed Tudor or Colonial Revival front, a half-round gutter with round downspouts usually sits better against the period trim.

Where the cornice is the point of the house, a metal reline in copper keeps everything original and weathers to a patina that suits brick and stucco. It is the slowest and most expensive route, but it can outlast every other option on this list.

If your home sits in the Field Club or Country Club historic districts, both listed on the National Register, ask whether any local review applies before changing the roof edge. Relining leaves the exterior as it was. Converting does not.

A sound built-in gutter needs more attention than a hanging one, because its problems hide. Clean it each spring and fall, keep the outlets fully open, and look along the liner for rust spots, cracked seams and old tar patches. Recoat terne and tin liners with a compatible coating before the paint wears through.

Check the soffit and frieze below the box every spring for fresh stains or peeling paint. Damaged soffit under a built-in gutter is almost always a symptom of the liner above rather than the main problem.

If you own an older home in Dundee, Field Club, Hanscom Park or the Cathedral area and you are seeing stains near the eave, call us. We can look at the liner, the wood and the outlets and lay out which repair path fits the house.