Two Montvale houses in five — 40.6% of the borough’s 3,188 units — were built in the 1960s and 70s, the highest share of that era among the fifteen Bergen County towns we cover. Montvale is the purest split-level town on our list.
The corporate campuses are what people know, A&P’s world headquarters from the 1970s to 2015 among them, but 84.1% of Montvale’s units are owner-occupied and 64.3% are detached houses. This page is for the owner of the split first.
The houses we insulate in Montvale
The median Montvale home was built in 1968. Of 3,188 units, 13.9% predate 1940, 14.1% went up in the 1940s and 50s, 40.6% in the 1960s and 70s, 11.7% in the 1980s and 90s and 19.8% since 2000; 68.5% predate 1980. Beyond the 64.3% detached, 13.5% of units are attached and 13.8% are in two- to four-family buildings. 84.1% heat with gas and 6.3% still burn oil, more than the county’s 3.9%.
The borough doubled in each of the 1950s and 1960s, from 1,856 people in 1950 to 3,699 in 1960 and 7,327 in 1970, and the houses that did it are splits, ranches and colonials. A split-level has more attic than it looks like it has: a long low flat over the bedroom wing, a smaller attic over the living-room wing at a different height, and a wall between them that runs open from one to the other. What we find is settled loose-fill, eaves with no baffles so the wind washes through the insulation at the edge, a cantilevered bay hanging past the foundation with its joist bays open, and a bedroom over the garage with nothing sealed between the two. Nothing is broken. The standard moved, and every bypass under the loose-fill was left open the day it went in.
The 14.1% from the 1940s and 50s are capes: knee walls with no air barrier behind them, joist bays open to the eave, unbaffled slopes, a shallow flat. The 13.9% built before 1940 is balloon-framed, stud bays open from sill to attic, and we check for knob-and-tube before any wall is filled. Two stone houses are on the Register, Eckerson and Holdrum–Van Houten, and those we do not drill: the work is the garret, the cellar and rim, and any frame wing.
Montvale is a Pascack Valley town like Hillsdale, but a younger one, and the difference shows in the attic: fewer knee walls, more long low flats over splits.
Montvale’s newer fifth: townhouses and the North Market apartments
19.8% of Montvale’s housing has gone up since 2000, and much of it is one site. When Mercedes-Benz USA left its 37-acre campus in 2015, S. Hekemian Group took it: the Shoppes at DePiero’s Farm in 2017, Bergen’s first Wegmans, and North Market / Tri-Boro Square, about 308–312 apartments plus a hotel and retail, under construction from 2020. An apartment building that new is a management decision, not a homeowner’s, and it is not what this page is about.
The rest of the newer fifth, and the 13.5% of units that are attached, is townhouses. A post-2000 townhouse has walls built to code; what fails is the party wall where it opens into a shared attic, the garage-under floor at the rim, the duct runs and air handler in the attic, and bath fans that end there. The 1980s and 90s townhouses add R-11 or R-13 walls and R-19 to R-30 attics leaking at the rim, the garage wall, the cans and the soffits. In either, the attic above a row is usually the association’s, and the association signs.
We seal before we insulate
Insulation slows heat moving through a surface. It does nothing about air moving through a gap. Blow more loose-fill over open bypasses and you have deeper loose-fill over open bypasses.
In a Montvale split the sequence runs through the attic. Rake back the settled fill at the eaves and baffle them, seal the top plates and the wall that divides the upper attic from the lower, close the chase around the stairwell and the plumbing stack, block the cantilever bays where the bedroom floor hangs past the foundation, seal the garage ceiling under the bedroom, cap the cans and the bath fan, then blow back to depth.
If a quote specifies a depth of insulation and never mentions air sealing, it is half a job.
What insulation costs in Montvale
Most of our projects run between $3,500 and $12,500. In a Montvale split what moves the number is the length of low attic to seal, how many cantilever bays and how much garage ceiling there is to block and insulate, and whether the basement rim is reachable. A townhouse is priced on how many units share the attic.
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. ENERGY STAR says sealing air leaks and adding insulation can save up to 10% on annual energy bills.
Insulation rebates in Montvale
Montvale gets its electricity from Rockland Electric, the New Jersey arm of Orange & Rockland, and its gas from PSE&G.
Rockland Electric Whole Home Energy Solutions offers up to $7,500 in rebates plus interest-free financing, typically over seven to ten years. Every project must include at least attic air sealing and an attic insulation upgrade, which is the split-level job. The work must be done by a BPI-certified contractor participating in the program. Rockland Electric’s Home Energy Assessment is free for its residential customers.
Rockland Electric Home Weatherization covers insulation, air sealing and duct sealing at no cost for income-qualified households, roughly $39,900 to $63,840 for one person and more for larger households. Because the gas is PSE&G, PSE&G’s free Whole Home Energy Assessment also applies. Whether PSE&G’s rebate program accepts a PSE&G-gas, Rockland-Electric home is not stated on PSE&G’s page, so start with Rockland Electric’s program and confirm with PSE&G.
New Jersey Comfort Partners installs insulation and air sealing at no cost for households at or below 250% of the federal poverty guidelines, for example $82,500 for a family of four; homes heated with oil or propane are referred to the state weatherization office, which applies to the 6.3% of Montvale on oil. The New Jersey IRA Home Energy Rebates have not launched — the state’s page says “under development” — so they are not available yet. See the full rebate guide.
The federal Section 25C tax credit ended for anything placed in service after 31 December 2025. There is no federal insulation credit on a 2026 job.
Code and climate in Montvale
More than two thirds of Montvale, 68.5%, predates 1980, and New Jersey’s first statewide energy subcode took effect on 1 January 1977. Nearly all of those splits went up before the state had an energy code, so their insulation is thin and their bypasses were never sealed. Bergen County is climate zone 5A.
New Jersey adopted the 2024 IECC on 17 August 2026. For new construction it sets R-49 ceilings — the 2021 edition it replaced called for R-60, and a permit application filed under the old code is still accepted for six months, until about mid-February 2027 — with walls at R-20 plus R-5 continuous, windows at U-0.28, and air leakage of 3.0 air changes per hour at 50 pascals. R-49 is the number the state considers right for this climate, and it is what we design to.
A 1968 split falls under New Jersey’s Rehabilitation Subcode: insulating the attic does not require bringing the rest of the house to code or a blower-door test. Blown-in or batt insulation installed 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 Montvale
Do you install insulation in Montvale, NJ?
Yes. Most of the work here is 1960s–70s splits and ranches, 40.6% of the borough’s housing, with the post-war capes and the pre-1940 houses behind them. Montvale is 64.3% detached and 84.1% owner-occupied, so the scope is usually one house and one signature: the attic, the cantilever and the bedroom over the garage first, then the basement rim.
How much does insulation cost in Montvale?
Most projects run $3,500 to $12,500. In a split the drivers are the length of low attic to seal and bring to depth, the number of cantilever bays and the garage ceiling to block, and whether the rim in the basement is reachable. A townhouse is priced on how many units share the attic and whether the association scopes the row.
Are there insulation rebates in Montvale?
Yes. Montvale is Rockland Electric territory for electricity and PSE&G for gas. Rockland Electric Whole Home Energy Solutions offers up to $7,500 in rebates plus interest-free financing, typically over seven to ten years, and every project must include at least attic air sealing and an attic insulation upgrade. Rockland Electric’s Home Energy Assessment is free. There is no federal insulation credit on a 2026 job.
Our Montvale split-level already has insulation in the attic. Is adding more worth it?
Usually, but not on its own. The loose-fill of the 1960s has settled, the eaves have no baffles, and the bypasses under it — the top plates, the stairwell chase, the wall between the two attic levels, the cantilever, the garage ceiling — were never sealed. Seal those first and the added depth performs. Add depth without sealing and the bedroom over the garage stays cold.
Free energy audit in Montvale
In a split we walk both attic levels, the eaves, the cantilever and the garage ceiling under the bedroom, then the basement rim. In a townhouse we walk the shared attic and the party-wall tops. Then a written scope and a price, no charge, no obligation. If the attic is fine and the cold room is the cantilever, we will say so.
Call 914-825-6824 or use the form on this page. Open 8am–8pm, seven days. We work out of New Rochelle, NY with a 100-plus in-house crew.
Learn more
- Insulation contractors across Bergen County
- New Jersey insulation rebates in full
- Attic insulation guide
- Open cell and closed cell spray foam compared
- Air sealing
- Recommended R-values for New York and New Jersey
- What happens during an energy audit