The Home Insulators

Insulation Contractors in Deptford, NJ

18.7% of Deptford Township’s 12,465 housing units were built in the 1950s — the biggest single decade here, and more 1950s housing than any other Gloucester County town we cover. Add the 1940s and the cohort is 22.8%. Another 27.9% came out of the 1960s and 70s, which puts 55.7% of the township on the ground before New Jersey had a statewide energy code. The median unit dates from 1976.

That makes Deptford an early-postwar Philadelphia suburb rather than a modern subdivision township, and it changes what we find in the attic. The 1950s rancher and cape on a crawl space or a slab, the 60s and 70s split and bi-level, and the development houses that filled the rest are three different jobs, and only one is about adding depth to an attic.

72.5% of units are detached and 8.3% attached, 73.3% of occupied units are owner-occupied, 83.2% heat with gas and 4.8% with oil. The utility answer is not uniform either: the township is split between two electric companies and two gas companies.

The houses we insulate in Deptford

Deptford filled in from the Philadelphia side. The 1950s streets around Oak Valley, Woodbury Gardens, Woodbury Terrace, Westville Grove, Good Intent and Lake Tract are the core of that era: small ranches and capes on modest lots, most of them on a crawl space or a slab, a few with a shallow basement. The cape fails at the knee wall — a short stud wall with batts on the room side and nothing on the attic side, floor joists running under it out to an open eave, unbaffled slopes and a shallow flat above. The rancher fails across a long attic of loose-fill that has settled below its rated depth, with top plates, plumbing chases and a bare attic hatch all leaking into it.

Under those houses the crawl space is the second half of the work. A vented crawl on this coastal-plain soil, with sagging batts between the floor joists and bare ground below, loses heat in winter and adds humidity in summer, and any duct through it leaks into it. We seal the vents, lay a ground cover, insulate the crawl walls and rim, and bring the crawl inside the house. On a slab house there is no floor to insulate, so the attic plane and the ducts carry the job.

15.1% of the township is 1960s and 12.8% is 1970s: splits, bi-levels and larger ranches around Almonesson, Blackwood Terrace, Country Club Estates and Hammond Heights. The split-level is the one that catches people out. It has two or three separate attic planes at different heights, a knee wall between them, a bedroom over the garage with open joist bays under its floor, and a lower level half below grade. Insulating only the highest attic leaves most of the ceiling area untouched, which is why a split can be insulated twice and still be cold.

23.4% is 1980s and 90s and 20.9% has been built since 2000, including 16.0% in the 2000s alone. Those houses have full walls and are not a blown-in-wall job. The work is the air handler and duct trunk in a vented attic, cathedral slopes framed without baffles, recessed cans, garage ceilings and bath fans venting into the attic. The 1,029 attached townhouse units get the party wall closed first, because in most of them it stops at the ceiling line rather than running tight to the roof deck.

5.0% of the township predates 1940, which is the older fabric near the Woodbury and Westville edges. Those we treat as balloon-framed with knob-and-tube until the attic says otherwise, and the wiring comes out before anything goes into a wall.

Roofs rebuilt after the 2021 tornado

On 1 September 2021 an EF3 tornado with winds up to 150 miles per hour, thrown off by the remnants of Hurricane Ida, went through Deptford Township and damaged more than a hundred homes. Years on, that is still a live insulation question here.

When a roof deck is torn off and rebuilt on an insurance scope, what goes back is usually a roof: sheathing, underlayment, shingles. The insulation below it is a separate line item, and air sealing frequently is not a line item at all. What we find in rebuilt houses is new framing over an attic floor that still has the original settled loose-fill, baffles that were never reinstalled at the eaves, a ridge vent added without a matching intake, top plates and chases left open after the ceiling was patched, and batts that were soaked, dried in place and never replaced. Wet fiberglass that has been compressed does not recover its R-value when it dries.

If your roof was redone after 2021, the useful question is not whether the roof is good. It is what happened to the plane below it: compression and water staining in the existing insulation, whether the intake vents match the new ridge vent, and whether anyone sealed the ceiling before new insulation went down. Often the right answer is to take the old material out rather than bury it.

We seal before we insulate

Insulation slows heat moving through a surface. It does nothing about air moving through a gap. Blow fresh cellulose over a Deptford rancher with an open chimney chase and a vented crawl below and you have paid for depth that the air path will undo.

In the 1950s rancher or cape that defines this township the sequence is: seal the crawl vents, lay the ground cover, seal and insulate any ducts down there, then the crawl walls and rim; upstairs, block the joist bays at the eave under a cape’s knee wall and put an air barrier on its back side, seal the top plates, chases, cans and hatch, baffle the eaves and slopes, vent the bath fans outside, then insulate the flat attic to depth. In a split-level each attic plane gets the same treatment, and the knee wall between them is sealed on the attic side.

If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.

What insulation costs in Deptford

Most of our projects run between $3,500 and $12,500. Here the number moves with whether there is a crawl space to close, how many separate attic planes a split-level has, the feet of knee wall and eave to block in a cape, and whether storm-damaged insulation has to come out before new material goes in. A slab house needing only the attic plane and ducts sits at the low end; a split-level with three planes, a garage ceiling and a rim sits higher. Our spray foam cost guide has more.

Open cell foam runs R-3.9 to R-4.2 per inch. Closed cell runs R-6.9 to R-7.1 per inch and also acts as a vapor retarder, which is why it costs more and why it is right in some assemblies and unnecessary in others. All products are manufactured in the United States and meet applicable building code and safety standards. After air sealing and insulating, homeowners typically save 20% or more on heating and cooling.

Insulation rebates in Deptford

Deptford is really split, so start with your bills rather than an assumption. Most of the township is PSE&G for electric, with Atlantic City Electric serving roughly the southern quarter. Most of it is South Jersey Gas for gas, with PSE&G serving the northern end. Two houses on opposite sides of the township can end up in two different programs.

Where the gas is South Jersey Gas, its Whole Home Energy Solutions pays up to $7,500 in rebates — $2,000 for a modeled five percent energy saving plus $200 for every point above that, capped at $7,500 and at half the project cost — with 0% on-bill repayment of $2,500 to $25,000. It needs an active account and gas heat, and covers houses, townhomes, condos and buildings under four units. South Jersey Gas also offers a complimentary Whole Home Energy Assessment.

Where the bill says PSE&G, PSE&G Whole Home Energy Solutions offers up to $7,500 in rebates plus 0% on-bill repayment of up to $25,000, seven years for projects of $10,000 or less and ten above that. It starts with an assessment by a BPI-certified contractor participating in PSE&G’s program, and PSE&G does not publish per-measure amounts. PSE&G’s own Whole Home Energy Assessment is free once a year for a residential customer in a home of fewer than five units. Atlantic City Electric Whole Home Energy Solutions covers the southern electric customers: up to $7,500, not more than half the cost, plus 0% financing of $2,500 to $25,000, single-family residences only, no free walk-through stated. A house billed by two companies can use either program; start with whoever bills your heating fuel.

No-cost work: PSE&G Home Weatherization, the Atlantic City Electric Home Weatherization Program and South Jersey Gas Home Weatherization for Income-Qualified Customers all install insulation, air sealing and duct sealing at no cost between 250% and 400% of the federal poverty guidelines. New Jersey Comfort Partners does the same at or below 250%, $82,500 for a family of four in 2026, and refers the 4.8% of Deptford homes on oil to the state weatherization office.

The New Jersey IRA Home Energy Rebates have not launched — the state’s page says they are in development and not open for applications. The federal Section 25C tax credit ended for anything placed in service after 31 December 2025, so there is no federal insulation credit on a 2026 job. Details are in our New York and New Jersey rebate guide.

Code and climate in Deptford

55.7% of Deptford went up before New Jersey’s first statewide energy subcode of 1 January 1978, and on the 1950s streets that is close to all of it — houses built with no insulation requirement at all. Gloucester County is climate zone 4A, the milder coastal-plain zone, so the cooling season carries a real share of the savings here.

New Jersey adopted the 2024 IECC on 17 August 2026. New construction gets R-49 ceilings — the 2021 edition it replaced asked for R-60 — walls at R-30 cavity or R-20 plus R-5 continuous, windows at U-0.30 in zone 4A, and air leakage of 3.0 air changes per hour at 50 pascals. A complete permit application filed under the old code is still accepted until about 16 February 2027. R-49 is what we design to.

An existing house falls under New Jersey’s Rehabilitation Subcode: insulating an attic does not require bringing the rest of the house to current code and does not require a blower-door test. Blown-in or batt insulation against the interior finish is ordinary maintenance with no permit; spray foam and other foam plastic insulation need a permit, which we pull as part of the job.

Common questions about insulation in Deptford

Do you install insulation in Deptford, NJ?

Yes, across Oak Valley, Almonesson, Good Intent, Lake Tract, Blackwood Terrace, Woodbury Gardens and the rest of the township. Most of our work here is the 1950s rancher and cape, 18.7% of the stock, with its crawl space and knee walls, and the 1960s and 70s split-levels with their separate attic planes. We also handle the newer development houses where the air handler sits in a vented attic, and the 1,029 attached townhouse units.

How much does insulation cost in Deptford?

Most projects run $3,500 to $12,500. What moves it is whether a crawl space is being closed, how many separate attic planes a split-level has, the feet of knee wall and eave to block in a cape, and whether storm-damaged or water-stained insulation has to come out first. A slab house needing only the attic plane and duct work sits at the low end. You get a written scope and a price after a free walk-through, before anything is ordered.

Are there insulation rebates in Deptford?

Yes, but Deptford is split between utilities, so check your bills. Most of the township is PSE&G for electric and South Jersey Gas for gas, with Atlantic City Electric in the south and PSE&G gas in the north. Each runs Whole Home Energy Solutions with up to $7,500 in rebates and 0% repayment up to $25,000; South Jersey Gas publishes the formula, PSE&G and Atlantic City Electric do not. Income-qualified households can get the work at no cost. There is no federal 25C credit on a 2026 job.

Our roof was replaced after the 2021 tornado. Does the attic still need work?

Usually, yes. An insurance roof scope covers sheathing, underlayment and shingles; the insulation below is a separate item and air sealing often is not on the scope at all. We regularly find original settled loose-fill under new framing, eave baffles that were never put back, a new ridge vent with no matching intake, and batts that were soaked and dried in place. Compressed wet fiberglass does not recover its R-value. We check the plane below the roof, not the roof.

Free energy audit in Deptford

We open the crawl space and look at the batts, the ground, the ducts and the rim, then every attic plane the house has, the knee walls, the eaves, the chimney chase and the garage ceiling. In a house rebuilt after the storm we look hard at what was left under the new roof. Then a written scope and a price. No charge, no obligation.

Call 914-825-6824 or use the form. Open 8am–8pm, seven days. We work out of New Rochelle, NY with a 100-plus in-house crew and we never subcontract, and we hold manufacturer installer certifications from the spray foam manufacturers we use.

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