Structural Exclusion in Northport

What does the village design scheme govern, and what does it leave alone?

It governs the appearance of the building and leaves most of the openings to the owner — which turns out to be the useful half.

Northport incorporated in 1894, the first village in the Town of Huntington to do so, and it runs its own Board of Architectural and Historic Review. Applications for construction, reconstruction, alteration or demolition go through it. The criteria are specific about materials: red common brick, clapboard, shingles and stone, along with modern equivalents approved by the State Historic Preservation Office. The traditional roofline is described as varied — pitched and shingled, with dormers and gables — in slate, asphalt or wood shingles, and the colors run to natural muted tones and white.

Read that as a builder rather than as a planner and it is a description of where the building leaks. Varied rooflines mean valleys and intersections. Gables mean gable vents. Shingle fields move, lose fixings and let water into sheathing behind them. Every one of those is an exclusion item.

Then read the exemption. Painting and door and window replacement are expressly outside the review. On a village house that has stood since before 1940 — and about 920 units, 28.5 per cent of the stock, have — the openings may have been swapped two or three times across the decades with no record of any of it. The most productive single item on that building is therefore also the item least entangled in process.

That is the shape of this work in Northport. The high-value detailing at the openings is generally available immediately. The work that alters an elevation, rebuilds a porch, changes a roof material or replaces visible trim is a conversation with the village first. Scoping the job so those two categories are separated, and so the second is not holding up the first, is worth doing at the proposal stage rather than in September when the weather is about to turn.

Why is a replaced window the most productive opening on an old house here?

Because the original rough opening is still in the wall behind the new frame, and nobody closed the space between them.

A replacement window is set inside the existing opening. The old frame may have come out or may have been left in place; either way the new unit is smaller than the hole it sits in, and the difference is packed with whatever the installer had — offcut insulation, foam, sometimes nothing at all. From outside it is covered by a trim board or a length of coil stock. From inside it is behind the casing. Nobody has looked at it since the day it went in.

Three things are wrong with that space on a house of this age.

It is continuous with the wall cavity. Pre-1940 frame construction here has no sheathing membrane and frequently no insulation in the original bays. The stud bay runs from the sill plate to the top plate and often into the roof space. An opening at a window head connects to that shaft.

It is where water collects. Where the flashing, the sill pan or the drainage path behind the trim was not corrected during the replacement, water gets into the rough opening and stays. Damp timber in a wall is the resource that keeps a carpenter ant satellite nest viable, and it is the softest target available to anything chewing.

It is reachable. Unlike a mansard void or a closed cornice, this opening can be opened from outside with hand tools, inspected, corrected and closed properly, and the work is invisible when the trim goes back.

The correct detail is to remove the exterior trim, clear the packing, check the condition of the framing and the sill, establish a proper drainage path where one is missing, close the annulus with rigid material rather than compressible material, and re-trim. On an old village house with fifteen or twenty openings that is a real day’s work, and it deals with more of the envelope than anything else on the list.

What does a dormered, gabled roofline actually give away?

A soffit return at the base of every dormer cheek, and a louvred vent at every gable end.

The village criteria encourage exactly the roof geometry that generates this problem, and the older stock has it in quantity. Each dormer cheek meeting a main roof plane produces a valley, which concentrates water and debris, and a flashing joint that has usually been repaired at least once. At the bottom of the cheek, where the dormer’s own eave dies into the main roof, there is generally a small triangular box — the soffit return. On a great many houses that box is hollow, closed with a thin board, and open at its inner end into the eave cavity.

Gray squirrels find those returns before anyone else does. They are sheltered, they are dry, they are directly connected to the roof space, and they are at a height nobody inspects from the ground without binoculars.

The gable vents are the second item. On older houses these are louvred openings with screening behind them that has corroded, torn or gone entirely. The correct treatment is a mesh set back inside the opening, cut generously and fixed so an edge cannot be worked, with the louvres left doing their job. Closing a gable vent to keep animals out swaps a wildlife problem for a moisture problem in the roof space, and the moisture problem is the more expensive of the two.

Then the shingle field itself. Wood and slate shingles cup, lose fixings and move, and the flashing at their intersections was often improvised. Water behind a shingle field goes into sheathing, and sheathing at elevated moisture content is what a carpenter ant colony is looking for. There is a limit to what exclusion work can do about that; a sound covering is what keeps a roof cavity closed, and where the covering has failed the honest answer is a roofer rather than a mesh.

Chimneys complete the roofline list: a cap, an intact crown, sound flashing at the shoulders, and no gap where the stack passes the roof plane. Raccoons use a chimney as a den site by preference, and a chimney closed while an animal is inside it is a serious problem for the building and for the animal.

How does a falling lot change the grade line around one house?

It makes the single most important measurement on the property different on each elevation.

Northport sits on the low, steep hills of the Harbor Hill Moraine, and a parcel can drop twenty feet from street to shoreline within its own boundaries. Making that usable means terracing. There is a level sitting area somewhere, a retaining wall holding a bed, a set of steps, a paved apron, and a path cut into the slope.

The result is that the clearance between soil and the bottom of the siding varies dramatically around one building. The street elevation may be generous. The elevation behind the terrace may have none, because the terrace was built up to make a level surface and the last three inches of foundation disappeared under it. That is the measurement that decides how much of this work is sealing and how much is ground correction, and on this terrain it has to be taken at several points rather than once.

Two other consequences follow from the fall.

Retaining structures create permanent voids. Behind a dry-laid wall, under a set of built steps, beside a terrace edge — these are dry, protected spaces within feet of the building, and they are harborage in the literal sense. Sealing the house while leaving the harborage in place beside it produces a building under continuous pressure.

Water arrives with momentum rather than sitting. A leader discharging on a slope sends its water somewhere specific, and on a built lot that somewhere is usually a corner nobody chose. Walking the perimeter during or immediately after rain is the single most useful thing an owner can do here without any equipment at all, because on falling ground the wet corner is not always the one you would guess.

What does the harbor air do to the fixings?

It shortens the life of everything except the right metals, so the specification has to be decided by exposure rather than by habit.

Salt-laden air corrodes galvanised coatings and accelerates any junction between dissimilar metals. On an exposed shoreline elevation at Scudder Beach or Duck Island Harbor, mesh and fixings intended to last decades are specified in stainless or copper, and mixed-metal contacts are avoided rather than accepted. Two streets inland, on a sheltered village lot with buildings and canopy between the house and the water, the exposure is ordinary and the choice is wider.

That is a real cost difference on a large job and it is worth being explicit about, because a specification that treats the whole village as waterfront is expensive and one that treats it all as inland fails visibly within a few seasons.

The rest of the material discipline is the same everywhere and it is where most of this work goes wrong:

Mesh and hardware cloth wherever ventilation or drainage has to continue. Cut generously, set back inside the opening so it is concealed, and fixed so an edge cannot be worked.

Mortar appropriate to the wall at masonry. On a rubble or early block foundation that means a mortar softer than the stone rather than a hard modern mix, because a mortar harder than the surrounding material damages the material it is meant to protect.

Sheet metal at chewable edges: timber corners, door bottoms, the base of a jamb, the leading edge of a soffit board.

Rigid closure, cut to the opening, at soffits, returns and cornice ends — not material pushed into a gap.

Proper terminations for dryer vents, extract fans and combustion flues, which are appliances rather than holes.

What fails, predictably: cured expanding foam, which is chewed through and which fails a second time by making a live opening look closed, and which for both of those reasons we do not put into a house in any position; plain steel wool, which corrodes and stains; sealant doing a structural job; and hard cementitious patching over a moving joint, which cracks in the first season and then holds water in the crack.

What has to be closed on the outbuildings before the house?

Everything the house needs, and generally sooner, because the outbuildings are where the population lives.

The village’s history has left a great deal of secondary structure behind. Garages, garden stores, workshops, gear lockers and boathouses, many of them older than the house they serve and framed with the generosity of buildings meant to be worked in rather than lived in. Sills sit low, boards are wide, joints are open, and there is no reason anyone ever sealed any of it.

Working outward from the residence finds the overflow rather than the source. Working inward from the outbuildings finds the source. The order matters more here than the technique does.

What these structures need is a shorter list than a house but a firmer one. The bottom edge of the cladding, where boards have shrunk away from a sill. The door — a real threshold and a jamb that meets it, rather than a gap you can see daylight through. The junction where a lean-to or a later addition meets the original structure. Vents and any opening high in a gable. And, if the building is used for storage, a change in how the contents are kept, because canvas, cordage, cushioning and cardboard on a floor is a nesting substrate no amount of sealing overcomes.

A shoreline outbuilding is best surveyed at the end of the season rather than at the beginning, because that is when it tells you what has spent the summer in it.

What does a village cellar need at floor level?

Attention to a short list of things that were installed for a way of living nobody here has used since the 1950s.

Cellars under the older village stock were dug for storage, for coal and for a boiler that burned it, and the arrangements that served those uses are mostly still in the building even where the uses have gone. Four of them matter.

The bulkhead or hatchway door. An external cellar entrance with sloping doors over it is a large opening at ground level on the wettest side of most houses. The doors have rusted or warped, the frame has moved, the sill under it has decayed, and the gap at the head or along the leading edge is generous. This is one of the few openings on an old house big enough to admit anything and low enough to be found by everything. It needs a frame that meets the doors, a sound sill and a threshold, not a length of weatherstrip.

The coal chute. Where a chute door survives it is a plate over a hole through the foundation wall, and behind the plate is frequently nothing but rubble and daylight. These are permanently closable, and closing one properly is worth more than a season of exterior baiting.

Abandoned services. A redundant water service, a capped-off oil fill line, a disused sleeve where a feed came in before the utility was moved. On a house that has been continuously occupied for a century these accumulate, and each one is a hole through the wall that no longer has a job. Every one of them can be closed permanently once it is found, which makes them the most satisfying items on the list.

The floor itself. Where a stack passes through a slab, at cleanouts, and at any point where an old drain line was cut and left, the opening is below the level anyone inspects. On the harborfront streets, where the drainage predates most of the plumbing connected to it, this is where the productive checks are.

In what order does this run on a village property?

Survey, reduce, close, correct the ground, verify — and the sequence is not interchangeable.

Survey the building and the ground together. The perimeter at grade on every elevation, with the planting moved and the soil pulled back where it has to be. Every penetration. The roof plane from the ground with binoculars, methodically, because almost all wildlife entry here is above the gutter line and almost none of it is visible from inside. Then the water: where each leader discharges, where the grade falls, where beds have been built up, and where the ground stays dark after rain.

Reduce any interior population first. Closing a building that still holds animals takes away their way out and concentrates them in wall voids. On construction with continuous cavities from sill to roof, that is a particularly awkward outcome. The reduction side is rodent control in Northport.

Close the openings, matched to substrate, and record every one — location, what was found, material used, photograph. Anything unreachable goes on the same list with a note explaining why.

Then correct the ground. Cut planting off the wall. Drop beds that have risen above the top of the foundation. Extend leaders to somewhere with fall. Deal with the terrace or retaining structure that has created a void beside the building. On a falling lot this is frequently the largest single item, and it does not look like pest control at all.

Then verify, after weather, and specifically after a freeze-thaw cycle has tested the masonry work.

The same survey produces the wood-to-soil findings, and in a maritime microclimate working through a seven-foot tidal range they are worth correcting whether or not an insect has found them yet. The one that usually has is the carpenter ant, and that is ant control. The other candidate is the eastern subterranean termite, which Graduate does not treat and does not inspect for; where the evidence points that way the honest step is identification, set out at eastern subterranean termite, followed by a firm that does that work. For the discipline itself, see structural exclusion; for what the whole village produces across every service, pest control in Northport with the Long Island hub and the full coverage list.

What does the Northport calendar look like?

Late August to November for the closing, spring for the ground, winter for the diagnosis.

Late August through November is the decisive window. Cooling nights move house mice toward buildings, and a building closed before that happens does not acquire the winter population it would otherwise carry through to spring. The weather still supports ladder work, roof work and grade work.

It also avoids the hardest question in this trade, which is whether anything is inside a void when you close it. With bats and raccoons that is both a welfare problem and a building problem — a trapped animal makes a second opening, and the second is always worse than the first. Cornell’s guidance is explicit that the relevant law varies and that the New York State Department of Environmental Conservation should be consulted before any animal is trapped or excluded. Doing the roofline before denning season starts removes most of the difficulty.

December to February is diagnostic. On a still, cold morning an old frame house shows where warm air is leaving it, and air leaks and pest entries are the same openings. Interior work — cellar sealing, chase closure, trimming around a chimney — is comfortable in this period and disruptive in July.

March to May is when the ground reads. Before planting fills in, burrows, runs, harborage and grade problems are visible, and the winter’s record on masonry, steps and terraces is fresh.

April to June is the window for drainage correction, because the ground is workable and any change can be tested against the same season’s rain rather than waiting a year to find out whether it helped.

How do you check the work was real?

By reading the record rather than the invoice, and by looking again after a winter.

A scope on a village house should list items one by one: a location precise enough for somebody else to stand in front of, what was found there, the material used, and a photograph. Conditions referred elsewhere — a failed roof covering for a roofer, a settled terrace for a mason, a suspected slow leak for a plumber — appear as referrals rather than being quietly dropped.

The re-check a season later asks four questions.

Has anything opened? Freeze and thaw move old masonry more than they move modern walls. Lime-bedded stone in particular gives up joints over a winter, and a repointed section is worth putting a hand on rather than looking at.

Has anything been undone? This is the common one. An irrigation trench, a new fence line, a drainage retrofit, a landscaping job, a replaced line set, a re-laid path. Every one of those routinely removes exterior sealing, and nobody connects a landscaper with a pest treatment. If any exterior contractor has been on the property, the sealing is worth re-checking.

Has the ground crept back up? A bed gains a little depth with every mulch top-up, and five years of that removes the clearance you set.

Has anything new grown into the roof? A limb reaching a roof edge is a wildlife route, and it was not there when the survey was done. In a village with mature street canopy over steep-pitched roofs, that changes faster than people expect.

Comparable stock, with different constraints, sits west across the neck at Cold Spring Harbor, south at Huntington, and — at the opposite extreme of density — at Lloyd Harbor. For a proper read of the perimeter and the roofline rather than a number to seal a house, tell us what the building is and what era it belongs to.

Related

• Structural Exclusion — how we approach it
• All pest control in Northport
• Rodent Control in Northport
• Ant Control in Northport