Structural Exclusion in Kings Point

What does structural exclusion mean on a property this size?

It means closing a group of buildings instead of a building, and treating the ground between them as part of the envelope.

A2 zoning sets the terms: forty thousand square feet of lot, a sixty-foot front yard, twenty-eight feet to each side line, and a permitted-use list running to private garages and greenhouses alongside the dwelling. The village-wide picture is at pest control in Kings Point. What it produces as exclusion work is a scope with four or five separate envelopes in it and several hundred feet of trenched ground tying them together.

The first thing that changes is arithmetic. A quarter-acre house in a post-war subdivision has perhaps 180 feet of perimeter at grade, one roofline, one garage and two or three service penetrations. A parcel here carries the residence, a detached garage, a pool house, a gate lodge or a greenhouse, sometimes a boathouse at the water, and a shed older than all of them — each a complete envelope with its own sill line, roof edge and set of holes cut by trades who never spoke to each other.

The second thing that changes is sequence. On a small lot you close the house and the matter is finished. Here, closing the house first pushes whatever is resident into the garage and the pool house, and closing those a season later pushes it back. A property of this shape is closed in one campaign or it is not closed.

The third is that the findings are not where the eye naturally goes: behind a planting bed, under the lip of a terrace, at the back of a garage nobody has emptied in a decade, and where new construction was married to a 1958 service trench. Structural exclusion sets out the general method; what follows is what it runs into here.

Why does the tree ordinance move the work onto the building?

Because the ordinary first recommendation in this trade needs a permit here, and the permit has real penalties behind it.

Chapter 147 covers any tree of six inches diameter or more, measured four and a half feet above the ground, and it reaches cutting, pruning, topping, elevating and burying roots. That is deliberately wide. An owner who wants a limb lifted off a slate valley is inside the ordinance rather than outside it, and so is the contractor who suggests it in passing. The application wants site plans showing tree positions against the improvements, photographs with the trees physically marked in ribbon or tape, and whatever further survey the inspector asks for. Replacement is set at 110 percent of the diameter removed, with a floor of one three-inch caliper tree per tree taken and five years of maintenance attached. A first violation runs from $1,500 to $20,000, a third inside five years reaches $60,000, and up to fifteen days of imprisonment is available to the court.

We are not the people to advise anyone about that code and nothing here should be read as advice about it. Village Hall and an arborist who files these applications regularly are. What we can speak to is what it does to a scope of work: the branch is a variable an owner may not be able to move quickly, and the roof is one they can move this month.

That changes the shape of a roofline closure. Where canopy can be cut back, five obvious openings can be closed on the understanding that pressure against the building has fallen. Where it cannot, that pressure stays at full strength indefinitely, and a roof with three openings closed and two open is a roof that has not been closed. So the count rises: every boxed-in return, every gable louver, the ridge closure along its length, the drip edge, the flashing at each chimney, and every junction where one roof plane dies into another or into the cheek of a dormer.

It also changes where money is best spent. Where canopy removal is simple, a day of tree work can be worth more than a day of sealing; here it is the reverse. What arrives over the canopy, and how its evidence is read, belongs to rodent control and to wildlife work. The question this page settles is narrower: which surface is lawfully yours to alter without an application, and in this village that is the building.

What does water moving through this ground do to a building?

It opens it — not in one season, but continuously, and from below, which is where nobody looks.

New York Sea Grant’s account of how a north shore bluff fails was written for a shoreline, and the mechanisms it names are the same ones working on a foundation three hundred yards inland. Waves take the toe once the beach in front of it has gone. Groundwater travelling through the bluff loosens material, picks it up and erodes at the point where the flow emerges. Surface runoff carries sand down any face that has lost its vegetation, and losing that vegetation leaves bare ground open to rain and wind. Then the detail that matters most to a homeowner rather than to a coastal engineer: water entering the ground, by rainfall or by a sprinkler system, speeds the failure up, and the remedy is drainage and berms that send it elsewhere.

The bluffs on this end of the Sound are cut into the Manhasset formation — till and outwash under a thin skin of Harbor Hill till, described as rock flour, coarse sands, pebbles and boulders — standing at roughly ten meters here, lower than the segments further east. That is a material with very little cohesion once water is running through it.

Translate the same mechanisms to a building and the list gets specific. A foundation wall with water moving along its outer face loses the fines out of the backfill, and what the backfill loses becomes a void held against the wall. A mortar joint carrying moisture through the winter opens with each freeze and thaw until it is a continuous gap rather than a joint. Settling backfill drops the grade into a trough you can see after rain, and the trough delivers the next storm to the same place. Where a leader discharges into made ground, water finds a path and keeps it, and a path in soil is a burrow with no occupant yet.

Which is why a survey here spends time on items nobody associates with pest work. Where every leader discharges and how far off the wall it lands. Whether grade falls away from the building along its whole length or only across the front. Whether the irrigation heads at the corners are throwing at masonry twice a day. Whether a terrace has dropped along one edge, and whether a retaining wall still has a working weep system. On a lot falling toward the water, the sprinkler schedule is a line item in an exclusion scope.

None of that is sealing, and all of it decides whether sealing lasts, because a closure fixed to a substrate still moving has a date on it.

What is different about a converted estate outbuilding?

Everything about the openings, and nothing about the principle.

This peninsula carries a building type that barely exists elsewhere in Nassau County: the estate outbuilding that has become a dwelling. Stables, carriage houses, gate lodges, greenhouses and garages built for estates that no longer exist. The clearest local case is Martin Hall, which burned in 1932 and left its stable standing, now a private residence of more than 15,000 square feet.

The difficulty is that those buildings were detailed for a use with different requirements. A stable needed air at floor level and a way for water to leave the floor, so it has ventilation slots low in the wall, drainage channels cut into the slab, and door openings sized for an animal. A carriage house needed clear width for a vehicle with a turning circle, so its principal openings are wide, headed in timber and often rebuilt more than once. A greenhouse needed ventilators and a heating run, and the heating run entered somewhere. A building taking a coal delivery needed a chute through the wall.

A conversion deals with what the building looks like and what it needs in order to be habitable. It does not reliably deal with a slot three inches above a slab, a drainage channel now running beneath a finished floor, a redundant chute capped in boarding, or the gap behind a header where a cart opening was framed down to a domestic door. All four turn up regularly, and none appears on a list written for a house.

So these buildings get surveyed from the outside in and from the floor up, with the original use held in mind. What was this space for, where did air and water enter and leave it, and what became of those routes when the purpose changed. The closures that follow are almost all fabricated, because there is no stock part for a ventilation slot in a rubble wall or the head of a former cart opening. A floor channel is traced to wherever it discharges and dealt with at that end as well as inside the room.

The estate-era principal houses present the same problem at a larger scale: thick walls, slate or tile over complicated geometry, and a century of penetrations cut by trades working decades apart.

What does a 1950s or 1960s house here give up first?

A short, repeatable list, which is good news, because a repeatable list can be finished.

Half the housing stock sits in that period: 470 units from the 1950s and 304 from the 1960s against a median construction year of 1961, with the 1970s nearly empty at 27. What they share is a poured foundation, a frame on it, and sixty-odd years of other people’s work layered over the top.

The rim. Where the sill plate meets the top of the foundation wall there is a joint, and on this generation it was very often covered rather than sealed. From inside a basement it is visible between the joists along the full length of the wall. It is the most productive single item on a house of this age and among the least inspected, because getting to it means moving stored material off the wall.

Service holes cut on site. Water, gas, electrical service, irrigation, the air-conditioning line set, a generator feed, a pool line, exterior lighting. Each was cut to clear its pipe and hardly any was closed afterward. A sleeve is not a seal, and an annulus around a pipe is an opening with a guide rail attached to it.

The garage. The junction between jamb and seal at the bottom corners of an overhead door opens as the seal ages and the slab moves, and the triangular gap it leaves is predictable enough to look for first. The side door into the house rarely has a sweep worth the name. On a detached garage, add eaves that are frequently open.

Low soffits and returns. The boxed sections where a roof edge dies into a wall were often left open in original construction here, and they connect directly to the attic.

Vents. Foundation vents, gable louvers and crawlspace openings. Screening fails at the cut edge first, where the coating stops, and once it has gone there the vent is simply a hole at the height a mouse travels.

Sixty years of retrofit. Replacement windows with the old opening framed down and the gap left behind the trim. Basements finished over the rim. Insulation upgrades that buried everything worth seeing. Rear additions married to the original frame at a seam nobody flashed, which on this housing type is the second most productive finding after the rim.

What does a rebuilt house hide below grade?

The previous house, broadly, and whatever was done to it on the way out.

Roughly 400 houses in the village were built or rebuilt between 1974 and 2024, with 95 units recorded as 2020 or later, and nearly all are replacements on lots laid out decades earlier. Above grade they are new and frequently very well built. Below grade they are inheritances.

What gets inherited is consistent. The old driveway and area drains, still connected to something. Irrigation sleeves crossing the site at a depth nobody wrote down. The service trench from the street, reused because digging a second one serves no purpose. Sections of earlier foundation left where they sat below the new footprint. Construction timber — form lumber, stakes, offcuts, pallet material — put back into the backfill because carting it away costs money. And on many lots an earlier cesspool covered over rather than decommissioned.

Each matters for its own reason. An abandoned drain is a cavity with a connection to open ground at one end. A sleeve is a ready-made route beneath a slab. A reused trench is ground disturbed twice that settles unevenly, and settlement against a wall is where the next opening appears. Buried timber is food and moisture at the depth termites travel. Cornell Cooperative Extension asks for three inches between wood siding or baseboard and soil, with eight inches of clean concrete beneath the baseboard, and a regrade that brings fresh planting beds up against new siding removes that clearance in an afternoon.

The practical finding sits at the junction. New construction meets inherited below-grade work at a handful of points — where the reused trench enters the new wall, where an old drain was tied into a new line, where a new slab was poured over an older footing — and that is where detailing is thinnest, because two crews each assumed the other had dealt with it.

An owner whose house was finished five or eight years ago assumes the envelope is sound, and above grade it usually is. The exposure is that nobody has looked since the certificate of occupancy, and on a weather elevation five years is long enough for a screen to fail at its cut edge.

What goes into each opening, and what never does?

A short list, chosen against the substrate and fixed mechanically, plus one product that is not on it in any position.

What this firm installs is custom-fabricated 26-gauge galvanized sheet metal, cut and bent on site to the opening rather than trimmed off a stock piece and made to look close enough. Mortar and hydraulic cement wherever the substrate is masonry, which on the older buildings means repointing before anything is sealed, since sealant over a failed joint fails along with the joint. Copper and stainless mesh where an annulus has to be packed, and on any salt elevation, because a fill that corrodes leaves a stain down the wall beneath it. Hardware cloth where an opening has to go on passing air. Xcluder fill fabric around services and Xcluder door sweeps at thresholds. Xcluder GEO where a barrier has to sit below grade against burrowing, which on a lot with voids already in the ground is more often than usual. Mechanical fasteners throughout, because adhesion is a prediction about a surface nobody prepared.

Expanding foam is not in the specification anywhere, in any role. Not as the barrier, not behind one, not skimmed over one. The test underneath that is one an owner can apply without us: rodents chew through cured foam, and so does most of what comes over the canopy here. The second reason matters on a property with several buildings and a long service life. Foam reads as completed work to the next person who opens that wall, so on the strength of looking like a seal it gets left where it is.

Three things have to stay open, and getting this wrong is the commonest technical error here. Weep holes in brick veneer are drainage, so they are screened rather than filled. Foundation and crawlspace vents on a building designed to breathe through them take hardware cloth, not sheet. A ventilation path belonging to the roof assembly is left working and screened where it enters, because closing it moves a moisture problem into the roof structure, and softened framing is the condition carpenter ants are waiting for.

What order does the work follow on a lot this size?

Reduce, correct the water, close from the outbuildings inward, then verify. The order is not negotiable and inverting it is how this work fails.

Reduce first. Closing a building with a live population inside takes away the route out and concentrates the animals in the wall voids, which is worse than the problem reported. Reduction comes before closure every time, and on a compound that means the outbuildings as well as the house.

Then the water. Leaders extended to discharge clear of the wall, grade corrected where it falls toward the building, irrigation heads turned off the masonry, a dropped terrace edge dealt with, failed flashing replaced. This is the step owners most want to defer, and it decides how long everything after it survives.

Then masonry. Repointing and cement work go in ahead of any closure that will be fixed to them.

Then the detached structures, before the house. Garage, pool house, greenhouse, gate lodge, boathouse, shed. Leaving them to a second phase keeps a reservoir on site to refill the building you just finished.

Then the house, from the ground upward. Rim, service penetrations, vents, the grade-line openings behind the planting, the garage junctions, then the roofline, which on a building with several pitches meeting one another is the largest share of the count.

Then verify. A return visit after weather, and on exterior masonry after a freeze-thaw cycle, with the result written against the location list rather than described in general terms.

Timing has one answer in this trade and the acre lot sharpens it. Work in late summer and early autumn, because a structure closed before the nights cool never takes the winter population on, while one closed in midwinter begins with that population indoors. A compound has to be booked earlier than an owner expects, because there is more of it to close. Wildlife adds a constraint: bat exclusion cannot proceed during the maternity season, which New York’s health department puts from late May to mid-August, and squirrel and raccoon work carries the same consideration wherever young are present.

What does the written scope have to name?

Locations, building by building and elevation by elevation, with a material set against each one. A document that does not do that is not a scope.

The test an owner can apply without technical knowledge is whether the document could just as well describe the neighbor’s property. A page naming openings, materials and sequence in general terms describes the trade. A document naming which corner of which building, on which elevation, in what material and in what order, describes the property.

On a compound lot the inventory has to be explicit. Every structure listed, every elevation of it, the openings on each one numbered, the material set against each opening, the items that must stay open named as such with their screening specified so nobody later reads them as work left undone, the water corrections listed separately because several are not our work, and the sequence written down so it cannot be reordered.

Owners here frequently want that document before they commission anything, sometimes in order to put the work out to other contractors. That is a legitimate use of it, and it is why the specification is treated as a product in its own right under exclusion consulting. Talking a property through costs nothing. The survey and written scope on custom work at this scale carries a fee, and commissioning the work credits that fee against the project. We publish no prices, because a figure attached to work varying this much between two houses on one street is either meaningless or misleading.

One further item belongs in the record here, and the tree ordinance makes it unavoidable. Where canopy over a roof cannot be altered without a village permit, the document should say so against the elevation it affects, and state that the closure there was specified for pressure nobody expects to reduce. That note is what stops a later owner, or a later contractor, from reading a heavily closed roof as over-engineering and quietly undoing it.

Arnold Katz, who holds a B.S. in Entomology from the University of Georgia, is the staff entomologist on this work and still out on surveys; Ryan Katz runs the firm and the field side of jobs this size. The position between them has not moved in four decades. A pest problem is a building with an opening and a water path in it, and on an acre in Kings Point it is usually several buildings and more than one path.

Related

• Structural Exclusion — how we approach it
• All pest control in Kings Point
• Wasp & Hornet Removal in Kings Point
• Rodent Control in Kings Point
• Mosquito Management in Kings Point