The median Gloucester County house dates from 1979, and 51.4% of the county’s 117,530 units were standing before New Jersey’s first statewide energy subcode of 1 January 1978. What those years left on this stretch of the coastal plain is a particular set of surfaces: band joists bare on block, vented crawl spaces under ranches, finished rooms tucked into shallow rafters, air handlers on platforms in hot attics. Spray foam insulation is the material people here search for by name, and it earns its price in exactly those places — where the air barrier and the R-value have to land in the same few inches.
The county is low and it is owned. 73.5% of the units are detached houses, 79.4% of occupied homes are owner-occupied, and 77.8% of them burn utility gas, with 8.5% on fuel oil and 10.5% on electricity. That matters for foam more than for any other material: the roof deck, the rim joist and the crawl space walls all belong to the person answering the door.
Where spray foam insulation pays in Gloucester County houses
Rim joists and crawl space walls. A great many of the county’s older houses sit low on the ground rather than over a deep cellar, and the band of framing on top of the foundation is where the house leaks year round. Deptford is 22.8% 1940s and 50s, West Deptford 20.9% and Mantua Township 20.9%, and in those small ranches and capes the rim is usually bare or plugged with a loose batt. Closed cell ties sill, rim and subfloor into one surface, and foam up to 3 1/4 inches thick can stay uncovered when the product meets the code’s density and flame-spread limits. On the block walls of a crawl space the Department of Energy lists about 3 inches of closed cell against 10 inches of open cell, and says fiberglass and cellulose do not belong against that wall at all because fiber collects and holds moisture.
Knee walls and shallow slopes in the split-level belt. 26.2% of the county came out of the 1960s and 70s, and the share is highest in Washington Township at 36.2%, West Deptford at 32.6%, Monroe Township at 30.9% and Deptford at 27.9%. Splits and bi-levels of those years put a knee wall against an unheated side attic, a bedroom over an open garage ceiling, and a sloped ceiling in rafters too shallow for fiber and a vent channel both. A filled 2×6 bay of closed cell reaches roughly R-38 to R-39, and about 7 inches in a 2×8 reaches R-49, which is why a shallow slope gets foam rather than more batts.
Roof decks over ductwork. The newer half of the county runs its heating and cooling through the attic. 22.0% of Gloucester housing has gone up since 2000, and that is 76.2% of Woolwich Township and 45.2% of Harrison Township, with another 44.1% of Washington Township and 38.3% of Mantua Township from the 1980s and 90s. Those roofs are broken up by hips, valleys and dormers that are awkward to vent, and the air handler sits in the vented space. Foam against the underside of the sheathing brings that equipment inside the house; Section R806.5 of the International Residential Code allows the attic to go unvented when the assembly sits entirely inside the thermal envelope and the foam is in direct contact with the deck.
Houses that do not run on gas. Fuel oil still heats 9.1% of West Deptford, 8.7% of Monroe Township, 6.8% of Harrison Township and 6.6% of Mantua Township, and electricity heats 20.8% of West Deptford and 13.9% of Glassboro. In those houses every unit of heat is bought at a premium, and the surfaces foam handles best are usually the ones no previous contractor touched.
How we do spray foam insulation in Gloucester County
Foam bonds to clean, dry wood or masonry, so anything in the way comes out first. Wet, settled or rodent-fouled insulation is bagged under containment and the deck is cleared with a HEPA insulation vacuum. Mold growing on framing or sheathing is a remediation trade, and that company works before we do. Pebble-like vermiculite stays where it is until a licensed professional has tested it.
Then the material follows the surface. Closed cell runs R-6.9 to R-7.1 per inch, cures rigid and acts as a vapor retarder at about 1 1/2 inches, which puts it on rim joists, block and stone foundation walls, crawl space walls and shallow rafters. Open cell runs R-3.9 to R-4.2 per inch and suits roof decks with the depth to hold it and open framing in a gutted wall. Gloucester County sits in climate zone 4A, and that changes one rule in our favor: the vapor retarder coating the code puts on open cell under a roof applies in zone 5 and colder. Where a hybrid of foam and fiber goes into the rafters, the foam alone has to reach R-15 here for condensation control, against R-20 in the zone 5 counties north of us.
On the day, the crew masks finished surfaces, shuts the heating and cooling down in the work area, and checks the wood against the product data sheet — one manufacturer bars spraying on wood above 18 percent moisture content or within 5 degrees of the dew point. A test patch proves adhesion, the foam goes on in passes inside the thickness limit, and depth is measured as the work moves. The house stays empty until the foam has cured and the space has been ventilated and cleaned; plan on at least a day, and the manufacturer’s re-entry time is on the quote before anyone starts.
Foam is combustible, so the quote also names its fire protection. In living space and finished basements that is a thermal barrier such as 1/2-inch gypsum board, hung by the finishing trade. In an attic or crawl space entered only for repairs, an ignition barrier or a foam tested for exposed use is enough. An attic anyone stores boxes in needs the full barrier.
What spray foam insulation costs in Gloucester County
Most of our projects run between $3,500 and $12,500. Foam is priced in board feet — one square foot at one inch — so area times thickness sets the number, and an R-49 roof deck over a Woolwich Township colonial takes many times the material of a rim joist in a Deptford rancher. Closed cell costs more per inch and open cell needs more inches, so the assembly decides which is cheaper. Access moves the price too: the low crawl spaces under Mantua Township and Monroe Township ranches are slow to prep and slow to spray. Removing old material is its own line item, and the fire barrier is quoted with the work. The detail sits in our spray foam insulation cost guide.
Rebates for spray foam insulation in Gloucester County
Which program pays for a foam job here depends on two envelopes in the mail drawer. Atlantic City Electric bills the electric in 18 of the county’s 24 towns, Woolwich Township, Harrison Township, Mantua Township, Glassboro, Monroe Township and Washington Township included; Deptford and West Deptford are PSE&G territory. On the gas side, South Jersey Gas covers 20 of the 24, with West Deptford on PSE&G for both.
South Jersey Gas Whole Home Energy Solutions pays up to $7,500 per project — $2,000 at a modeled five percent saving plus $200 for each further percentage point, capped at half the project cost — with 0% on-bill repayment of $2,500 to $25,000, and a complimentary Whole Home Energy Assessment for customers. It requires an active gas account and gas heat. Atlantic City Electric Whole Home Energy Solutions also runs to $7,500 and no more than half the cost, with 0% financing of $2,500 to $25,000, publishes no formula, states no free walk-through, and is written for single-family residences only. It carries no gas-heat requirement, which makes it the practical door for the oil and electric-heated houses above. PSE&G Whole Home Energy Solutions offers up to $7,500 plus 0% on-bill repayment of up to $25,000 and starts with an assessment by a BPI-certified contractor participating in PSE&G’s program; its free Whole Home Energy Assessment is open to residential customers in homes of fewer than five units. Where the gas and the electric come from different companies, start with whoever bills the heating fuel and confirm with the other, and ask any installer, including us, whether they take part.
Income-qualified households can have the work done at no cost through the utilities’ weatherization programs, or through New Jersey Comfort Partners at or below 250% of the federal poverty guidelines, $82,500 a year for a family of four in 2026; homes on oil, propane or kerosene are referred to the state’s weatherization office instead. New Jersey’s IRA Home Energy Rebates are not available — the state has them in development and not open for applications. The federal Section 25C tax credit ended for anything placed in service after 31 December 2025. More detail is in the New York and New Jersey rebate guide.
Code and climate in Gloucester County
Gloucester County sits in climate zone 4A, the mildest winter zone in the state, which tilts the arithmetic of foam toward summer: a sealed roof deck keeps August heat off the ducts as surely as it keeps February heat in. New Jersey adopted the 2024 IECC on 17 August 2026. New construction takes R-49 ceilings, where the 2021 edition it replaced called for R-60, walls at R-30 in the cavity or R-20 plus R-5 continuous, windows at U-0.30 in the 4A counties, and air leakage of 3.0 air changes per hour at 50 pascals. Closed cell reaches that wall number in about 4 1/4 inches of a 2×6 bay.
An existing Gloucester house falls under New Jersey’s Rehabilitation Subcode, so improving one assembly does not drag the rest of the house up to new-construction numbers and no blower-door test is required. Where a cathedral ceiling cannot hold R-49, the code accepts R-30 over no more than 500 square feet or 20 percent of the insulated ceiling area, whichever is less. Under an unvented roof no Class I vapor retarder, plastic sheeting included, goes on the ceiling side, and any plastic on the attic floor comes off when the roof line is foamed.
Towns we serve in Gloucester County
Every town page carries that town’s housing numbers, the assemblies that fail in it and which utility pays:
Common questions about spray foam insulation in Gloucester County
Who installs spray foam insulation near me in Gloucester County?
We do, in the eight towns above and the boroughs between them. The Home Insulators has been family-owned since 2015, works out of New Rochelle, NY with a 100-plus-person in-house crew, and never subcontracts, so the people who quote a Harrison Township roof deck are the people who spray it. Before quoting we look at what is in the bays now, whether the roof has leaked, how the attic or crawl space is used, and whether foam is the right material for that surface at all.
How much does spray foam insulation cost in Gloucester County?
Most projects run $3,500 to $12,500. Foam is sold by the board foot, so the number follows area times thickness: a rim joist in a 1950s Deptford rancher is the smallest foam job we do, and an unvented roof deck over a post-2000 Woolwich Township house is one of the largest. Open or closed cell, the number of passes, crawl space access, the fire barrier the code requires and any old material coming out all move the price.
Closed cell or open cell spray foam for a Gloucester County house?
Closed cell, at R-6.9 to R-7.1 per inch, goes where moisture and depth are the problem: rim joists, block crawl space walls, foundation walls and shallow rafters over a finished second floor. Open cell, at R-3.9 to R-4.2 per inch, costs less per inch and suits a roof deck with rafter depth to spare or a gutted wall. In climate zone 4A the vapor retarder coating required on open cell under a roof in zone 5 and colder does not apply, which widens the choice here.
Can spray foam go into the closed walls of an older Gloucester County house?
Not standard spray foam. It sets in seconds and is made for open cavities, so it cannot be spread evenly through a hole into a bay full of wires and blocking. A finished wall in a Glassboro or Mantua Township house is either opened during a renovation or re-siding, or it is drilled and dense-packed with cellulose or fiberglass. Injection foam is a separate slow-expanding product for closed cavities. Active knob-and-tube wiring has to be replaced by an electrician before anything fills a bay.
Free energy audit in Gloucester County
The walk-through is free and specific to the house. We check the rim joist and the crawl space or slab edge, what is in the attic now, the eaves, the duct runs and the air handler platform, the knee walls in a split, and the slopes over any finished room upstairs. Then you get a written scope naming the foam, its thickness, its fire protection and the price, with no obligation.
Call 914-554-2289, 8am–8pm, seven days. The Home Insulators is family-owned, based in New Rochelle, NY since 2015, and every crew that comes to Gloucester County is our own — 100-plus people in house, never subcontracted.
Get my free estimateor call 914-554-2289, 8am–8pm every day