Old Wood on High Ground: Termites, Ants and Attic Animals in Morgan Park

North Blue Island, the 1869 plat and the 1914 annexation fight

Long before it was a city neighborhood, this was a strip of glacial high ground poking up from the flat bed of an ancient lake, and settlers called the settlement on it North Blue Island. Thomas Morgan kept a homestead here from the 1840s. In 1869 a land syndicate bought roughly 3,000 acres from his family and laid out curving streets that broke from the city grid. A rail spur, later replaced by the Suburban Line in 1889, carried commuters to work. The village incorporated in 1882, banned alcohol sales east of Western Avenue, and after a contested vote was annexed to Chicago in 1914.

That suburban start explains the houses. Architects including Dwight Perkins and Dankmar Adler worked here, and the Palliser firm's pattern-book designs show up on the ridge; Palliser's Cottage Home No. 35 at 2314 W. 111th Place is a designated Chicago landmark. Estate-sized homes line Longwood Drive. These are wood houses first and foremost, with deep porches, tall attics and siding over balloon framing, and they have stood for well over a century on soil that stays damp under heavy shade.

Eastern subterranean termites in sills, porch posts and lattice

No pest has more at stake on the ridge than the eastern subterranean termite. Colonies live in the soil and send workers upward through pencil-wide mud tubes to reach wood, feeding from the inside so a sill or joist can look sound while it is hollowed out. A frame house from the 1880s or 1890s gives them a long menu: porch posts resting on footings that have sunk to grade, wood lattice skirting packed with leaves, sill plates that now sit inches from soil after generations of landscaping, and basements finished in wood paneling against damp stone or rubble walls.

The slope itself adds risk. Soil on the north and east faces of the ridge dries slowly after rain, and mulch and leaf litter wash downhill against the uphill side of a foundation, quietly burying the lowest courses of siding. Swarmers are usually the first visible sign. On a warm day in April or May, a burst of small dark insects with long, equal-length wings appears near a basement window or a sunny porch door, and the shed wings pile up on the sill.

Houses this old almost always carry scars from earlier infestations, so the real question during an inspection is whether termites are working now. A careful inspector probes suspect wood, opens a section of mud tube to look for live workers and may return to see whether the break has been rebuilt. Treatment on a historic frame house usually means perimeter bait stations or a liquid termiticide applied by trenching along exposed soil, with drilling kept to concrete stoops and slabs rather than original woodwork.

Carpenter ants, the other wood problem under old box gutters

Black carpenter ants are often mistaken for termites, and on these houses both can be present at once. Carpenter ants do not eat wood. They chew out smooth galleries to nest in, and they strongly prefer wood that a leak has already softened. Built-in box gutters on Victorian and four-square roofs, porch roofs that hold snow and ice, and window frames whose glazing has failed all create that kind of wood. Small piles of coarse, sawdust-like frass beneath trim, and large black workers wandering a kitchen at night in spring, are the usual clues.

Indoor nests are often satellites of a parent colony outdoors, typically in a hollow oak, a rotting stump or an old railroad tie used as landscape edging. Good treatment finds both. Telling the swarmers apart matters, because the fixes are completely different: carpenter ants have a pinched waist, elbowed antennae and hind wings shorter than the front pair, while termite swarmers have a thick waist, straight antennae and four wings of equal length. Repairing the leak that softened the wood is part of the cure, not an optional extra.

Squirrels, raccoons and bats in turrets, dormers and high attics

The same oaks and maples that shade the ridge give eastern gray squirrels and fox squirrels a highway to the roof. A Victorian roofline offers more chewable joints than any modern house: dormer cheeks, turret bases, the seam where a porch roof meets the main wall, and fascia boards softened by peeling paint. Females look for den space before a late-winter litter and again before a second litter around late summer, and scratching overhead at dawn and dusk is the giveaway. Removal relies on a one-way door over the main hole, heavy mesh on every other gap, and careful timing if young are present.

Raccoons favor the tall attics and uncapped brick chimneys, tearing into a weak soffit or rotted roof board in late winter to raise kits, and their latrines can carry roundworm, so cleanup calls for protective gear. Big brown bats slip through half-inch gaps at ridge vents, loose flashing and chimney chases. They are protected insect eaters, so the only legal fix is exclusion with one-way devices, and most specialists hold off from about June to mid-August, when flightless pups are in the roost.

Frame Victorian, four-square, bungalow or ranch: inspection priorities

The type of house sets the inspection plan more than the street address does. On the ridge houses, a provider should spend most of the visit on wood-to-soil contact, the porch structure, any crawl space and the attic, often with a flashlight, a probe and a moisture meter. On the brick bungalows and frame cottages of the flatter blocks, the basement and the detached garage on the alley usually come first, because that is where mice, Norway rats and oriental cockroaches near old floor drains tend to show up.

Postwar ranches near the western edge behave more like the houses of neighboring Mount Greenwood, with slab-edge and garage-wall gaps, open lawns that draw grub-digging skunks, and cemetery grounds close by for opossums and raccoons to travel at night. Many homes of every era have been altered as well, with enclosed back porches, rear kitchen additions and basement rec rooms paneled over old masonry. Each change can hide a moisture problem or leave a gap where new plumbing was run, so mention any additions when booking. Every type shares one risk regardless of age: a large tree limb resting over the roof.

• Frame Victorians and Queen Annes: porch posts, lattice skirting, low sill plates, turret and dormer joints
• Four-squares: box gutters, gable vents, hip-roof soffits and stone basement walls
• Brick bungalows: basement window wells, the hollow under the front stoop, half-story attic vents
• Frame cottages: crawl areas, rear porch framing and siding that has been covered over
• Postwar ranches: garage-to-house walls, slab edges and soffit returns

Mice, Norway rats and basement roaches on the alley blocks

Away from the ridge, the pest list looks more like the rest of the South Side bungalow belt. House mice slip into basements where old mortar has let go around service pipes, beneath tired overhead-door gaskets and at the edges of basement sash, and they nest behind furnaces and inside finished ceilings. Norway rats dig in beside detached garages, under cracked slabs and along fences that face the alleys, especially where carts sit open or dog waste is left in the yard. A licensed provider usually pairs locked bait stations along the garage with sealing at the house, while a 311 request brings city baiting to the alley itself.

Oriental cockroaches, large, dark and slow, are the basement roach of the older bungalows and cottages. They live near floor drains, laundry tubs and the cold joint where floor meets wall, and they are most visible from late spring into early summer. Refilling dry drain traps, fitting drain covers and lowering humidity do as much as any treatment. Unlike the kitchen-dwelling German cockroach, they rarely climb to upper floors, so sightings upstairs usually point to a different species.

Twelve months on the south end of the ridge

January and February are den-hunting months for raccoons and squirrels, and soffit damage often shows after a thaw. March brings big brown bats out of hibernation and the first nesting squirrels. April and May are swarm season, first for termites on warm afternoons and then for carpenter ants, while raccoon kits grow in attics. From June into mid-August, bat exclusion waits while pups mature, yellowjackets build in porch ceilings and carpenter ant trails peak. Late August and September bring a second squirrel litter and the best window for bat exclusion. October and November are mouse months, in ridge crawl spaces and bungalow basements alike, and the time to cap chimneys before raccoons choose a winter den.

A few local quirks shift this calendar. The ridge warms and dries a little sooner than the low ground east of the tracks in spring, so termite swarms on sunny south-facing porches can come a week or two ahead of those in shaded basements. Heavy oak mast years, when acorns cover the sidewalks in fall, tend to be followed by more squirrel pressure on roofs the next winter. And the first hard freeze in late October or November is reliably the week when mice show up in crawl spaces that were quiet all summer.

A defensive checklist for a century-old wood house

The goal on a historic home is to cut off moisture and soil contact without altering what makes the house worth keeping. Nearly every item below can be done with materials hidden below grade or behind trim, and none of it requires replacing original siding or ornament. Owners on steep lots should check the uphill wall first, since that is where soil and leaves pile up after storms and slowly bury the bottom boards.

• Keep soil and mulch at least six inches below siding, sills and porch skirting
• Set wood porch posts on concrete or metal bases instead of bare footings at grade
• Repair box gutter and porch roof leaks promptly so carpenter ants find no soft wood
• Cap chimneys and screen gable and ridge vents with heavy mesh painted to match
• Trim oak and maple limbs back at least six feet from rooflines
• Stack firewood on a rack well away from porches and siding
• Run a dehumidifier in stone or rubble basements through the humid months
• Book a termite inspection every few years, and always before porch or siding work

Landmark status, crawl spaces and what a visit takes here

Much of the ridge sits within the Ridge Historic District on the National Register, a recognition that places no rules on private owners. City landmark designation is different, and individually landmarked homes need review for visible exterior changes. Pest work rarely triggers it, but if exclusion means replacing a vent cover, fascia board or porch element on a landmark, ask the provider to plan matching materials or painted mesh. Expect a visit to an old frame house to run longer than one to a bungalow. The provider may need to crawl under a porch, check the full attic and map moisture on suspect wood before recommending treatment. A same-day inspection is often possible when someone is working on the far South Side, while termite treatment itself is usually scheduled afterward.

Follow-up is part of the plan for most jobs here. Termite bait systems are checked on a schedule, often several times a year, and liquid treatments come with a recommended reinspection. Wildlife exclusion usually means a return trip to remove the one-way door once the animals are out and to seal the last opening. Ask how the provider documents what they found, such as photos of mud tubes or entry holes, since that record helps when a house is sold or a porch is rebuilt.