New Construction Spray Foam in Grand Rapids, Holland, and Kalamazoo: What Builders Spec

You’re signing a purchase agreement on a new construction home in Caledonia Township, looking at a spec home off Byron Center Avenue, or working with a custom builder on a lot near Lake Macatawa in Holland. Somewhere in the builder’s standard features sheet, you see “spray foam insulation” listed — and you want to know whether that means the same thing in a $350,000 Eastbrook production home as it does in a custom timber-frame build in East Grand Rapids.

It doesn’t. And the difference affects your energy bills for the next thirty years.

West Michigan builders are navigating a tighter set of code requirements than they were five years ago. Michigan adopted the 2021 International Energy Conservation Code, which bumped thermal performance standards meaningfully in Zone 5B — the climate zone that covers all of Grand Rapids, Holland, Zeeland, and Kalamazoo. At the same time, Consumers Energy is running rebate programs that can put real money back in the builder’s pocket (and yours, if it’s negotiated into the deal) for exceeding those minimums. Spray foam is sitting at the intersection of both pressures.

Here is what the builder specification sheets actually mean, what discerning West Michigan buyers are asking for, and how to tell whether the foam in your new home is doing the job it was sold as doing.

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Michigan IECC 2021 in Zone 5B: What the Code Actually Requires

Zone 5B covers the entire West Michigan corridor from Kalamazoo north through Grand Rapids and out to the lakeshore communities in Ottawa County. Before you can evaluate a builder’s foam spec, you need to know the floor the code sets.

Under Michigan’s 2021 IECC adoption, new residential construction in Zone 5B must meet these minimum thermal envelope requirements:

– Attic: R-49 – Cathedral ceilings: R-49 continuous or equivalent assembly – Above-grade walls: R-20 or R-13 + R-5 continuous sheathing (often written as “R-20 / R-13+5”) – Basement walls: R-15 continuous or R-19 cavity – Crawlspace walls: R-15 continuous

The wall assembly requirement is where spray foam starts earning its keep in West Michigan new construction. An R-13 fiberglass batt in a 2×4 wall — the old baseline — no longer clears the bar on its own. Builders going 2×6 framing with open-cell foam in the cavity can hit R-20 in a single pass. Builders using closed-cell foam on the rim joist and open-cell in the walls are hitting air-sealing metrics that fiberglass simply cannot match, which matters for the blower door test that inspectors now require.

West Michigan winters are not abstract. Grand Rapids averages around 134 heating degree days per month in January. Holland and Zeeland get lake-effect snow that can drop temperatures sharply and hold them there. Kalamazoo sits slightly inland with less lake moderation. Code minimum is survivable; it is not comfortable.

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Production Builders: Eastbrook Homes, Allen Edwin, and What “Standard” Means

The two most active production builders in the Grand Rapids and Holland markets — Eastbrook Homes and Allen Edwin Home Builders — both offer spray foam as either a standard feature or an upgrade, depending on the community and the base package.

Allen Edwin, which builds heavily in the affordable-to-mid-range segment across West Michigan and into the Battle Creek and Kalamazoo markets, typically specs open-cell spray foam in the attic at their energy-efficient packages. Their standard build is designed to be ENERGY STAR certifiable, and open-cell foam in the roof deck (the underside of the sheathing rather than the floor of the attic) creates an unvented attic assembly that performs well when mechanicals are run through that space — which is increasingly common in their floor plans.

Eastbrook builds communities like Thornwood in Caledonia, Whispering Ridge in Jenison, and various developments in the Byron Center corridor. Their spec sheets often call out spray foam at the rim joist as standard, with attic spray foam available as an upgrade tier. The rim joist is one of the single highest-impact locations for spray foam in a cold climate — it is where the wood framing meets the foundation, where thermal bridging is worst, and where air leakage concentrates. A properly foamed rim joist in a Grand Rapids home can measurably shift both heating load and blower door numbers.

What discerning buyers in these communities are now asking for, particularly buyers coming from custom or semi-custom experience:

– Is the attic vented or unvented? (Unvented with spray foam on the roof deck is better for homes with HVAC in the attic space) – Is it open-cell or closed-cell in the walls, and what’s the installed R-value per inch? – Was a blower door test performed, and what was the ACH50 result? – Is the rim joist 100% foamed, or just the visible sections?

If a sales rep cannot answer those questions, that is a signal worth noting.

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Custom Builders in West Michigan: Holland, Zeeland, East Grand Rapids, and the Lakefront Market

The custom builder market in West Michigan operates in a different tier. Builders working in East Grand Rapids, Ada Township, the Cascade Road corridor, and the Holland lakeshore — particularly in neighborhoods near Lake Macatawa, Macatawa Park, and out toward West Olive — are routinely spec’ing closed-cell spray foam as the wall and rim joist assembly.

Closed-cell foam runs roughly 1.5 to 2 inches on walls to hit R-10 to R-13 continuous before cavity insulation is added. In a 2×6 wall, a flash-and-batt assembly (1 to 1.5 inches of closed-cell plus fiberglass batt) gets builders to R-20 or better with an air barrier that passes the tightest blower door targets. Some high-performance custom projects in the Ada and Forest Hills area are targeting 1.5 ACH50 or lower — well below the code ceiling of 3.0 ACH50 — using full closed-cell assemblies.

Why does this matter on the lakeshore? Holland and Zeeland sit in one of the higher wind-exposure zones in the state. Lake Michigan drives persistent westerly winds that pressurize building envelopes harder than the Grand Rapids metro proper. Air sealing performance — not just R-value — determines comfort in those homes. A Holland home with inadequate air sealing will draft noticeably on the north and west exposures in January, regardless of what the R-value on the inspection card says.

Custom buyers in Zeeland and the surrounding Holland Township area are also working with builders who have relationships with local foam contractors, which means application quality tends to be higher than in production builds where volume bidding can affect crew skill level and quality control.

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Consumers Energy Rebates for New Construction Spec Homes

Consumers Energy — the primary natural gas utility serving the Grand Rapids and Holland service territory — runs rebate programs through their Energy Efficiency program that apply to new construction. As of the current program cycle, new construction rebates are available for builders who exceed code minimum performance.

The rebate structure relevant to spray foam applications generally includes:

– High-efficiency air sealing bonus: Homes achieving 2.0 ACH50 or below on blower door testing can qualify for additional incentives – Whole-home energy package: Builders who bundle high-performance insulation, high-efficiency HVAC, and water heating can access larger rebate pools – Production builder program track: High-volume builders working directly with Consumers Energy can negotiate project-level agreements that pass incentives through at closing

For buyers in the Grand Rapids metro, it is worth asking the builder directly: “Are you enrolled in the Consumers Energy new construction program, and are any incentives included in this purchase price?” Some builders capture the rebate as margin. Others pass it through. You will not know unless you ask.

DTE Energy serves portions of the eastern Metro Detroit footprint, but for West Michigan builds — Grand Rapids, Holland, Kalamazoo — Consumers Energy is the relevant utility for natural gas efficiency incentives. Kalamazoo also has municipal gas service in some areas through Kalamazoo Gas Light (now served through Consumers), so it is worth confirming your service provider before assuming which rebate program applies.

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Open-Cell vs. Closed-Cell in West Michigan New Construction: The Practical Breakdown

The foam type question comes up in almost every new construction conversation. Here is what actually matters in Zone 5B.

Open-cell foam (roughly R-3.7 per inch) is vapor-permeable, which creates a design consideration in cold climates. Michigan’s building science community has been consistent: open-cell foam on the interior side of a wall without a vapor retarder in Zone 5B can allow moisture to accumulate in the sheathing under certain conditions. This is manageable with proper design — either a painted drywall vapor retarder, a smart vapor retarder membrane, or by using open-cell only in attic applications where the vapor drive physics are less problematic. Most West Michigan builders using open-cell in walls are specifying a “smart” retarder (MemBrain or equivalent) to close that loop.

Closed-cell foam (roughly R-6.5 per inch) is a Class II vapor retarder by itself. In a flash-and-batt assembly, it handles the vapor and air control layers simultaneously. It is the appropriate spec for below-grade applications — basement rim joists, foundation walls, crawlspace walls — and for any assembly where moisture management is critical. It costs more per board foot, which is why production builders default to open-cell in walls and closed-cell only at the rim joist.

The practical rule of thumb for West Michigan buyers: ask for closed-cell at every rim joist and foundation perimeter, regardless of what’s used in the walls. That single specification has more impact on comfort, moisture control, and long-term building durability in a Grand Rapids or Kalamazoo winter than almost any other single insulation decision.

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What to Put in Your Builder Specification Addendum

If you are building new construction anywhere in the West Michigan market and you want spray foam done right, here is what to put in writing before you sign:

1. Rim joist: 2 inches closed-cell spray foam, 100% coverage, including all band joist sections and penetrations 2. Attic assembly: Specify whether vented or unvented. If unvented, specify minimum R-38 open-cell on roof deck underside; if vented, specify R-49 open-cell or blown-in on attic floor with foam at all penetrations 3. Walls: Specify assembly type — full open-cell cavity fill, flash-and-batt, or full closed-cell — and the expected final R-value of the complete assembly 4. Blower door test: Require a post-construction blower door test result in writing, with a target of 3.0 ACH50 or better (and ask for 2.0 if you are in a high-performance custom build) 5. Consumers Energy enrollment: Confirm whether the builder is enrolled and whether rebates are credited to buyer at closing

Do not accept “spray foam insulation included” as a complete specification. That phrase describes a material category, not a building performance outcome.

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Frequently Asked Questions

Does spray foam in new construction actually lower my utility bills in Grand Rapids, or is it mostly marketing?

The performance data is real, but it depends on the application. A home with properly specified spray foam — particularly at the rim joist, attic, and wall assemblies — that achieves 2.0 ACH50 or better on blower door testing will typically outperform a conventionally insulated home in the same floor plan by 15 to 30% on heating costs over a West Michigan winter. The lake-effect weather patterns that hit Holland and Grand Rapids drive those numbers higher than you would see in more stable climate zones. The key word is “properly specified” — spray foam that is underthick, poorly applied, or missing at critical junctions like penetrations and rim joists will not deliver the modeled savings.

Is open-cell foam safe to use in Michigan walls, or should I always insist on closed-cell?

Open-cell foam is appropriate in West Michigan wall assemblies when designed correctly. The vapor permeability requires either a smart vapor retarder on the interior or a design that accounts for drying potential. This is not a reason to avoid open-cell — it is a reason to ask your builder what vapor management approach they are using with it. A builder who cannot answer that question is a builder who may be leaving out a code-required detail.

What’s the difference between what Eastbrook or Allen Edwin builds and what a custom builder in East Grand Rapids would spec?

Production builders are optimizing for cost per square foot at volume. They spec spray foam where it delivers the clearest return on code compliance and customer perception — rim joists, attic packages — and use fiberglass or blown-in for the rest where code allows. Custom builders have more design flexibility and often use closed-cell flash-and-batt assemblies throughout, achieving tighter blower door numbers and longer-term performance margins. The gap is real; it is also bridgeable in production builds if you know what upgrades to ask for before you sign.

Can I get Consumers Energy rebates as the homeowner, or do they go to the builder?

Rebates in the new construction program typically flow to the builder or contractor who performed the work. Whether that value reaches the buyer depends on what is negotiated in the purchase agreement. Ask specifically whether the builder is enrolled in the Consumers Energy new construction efficiency program and whether any incentives are credited to you at closing. Some builders pass them through as a closing credit; others do not mention them.

How do I verify the foam was actually installed correctly in my new build?

Request a copy of the blower door test results before closing. A result of 3.0 ACH50 or below confirms the air barrier is performing — spray foam is typically the primary contributor. You can also ask for photos of the rim joist and attic foam application before drywall goes up; responsible builders take progress photos as part of their quality documentation. If your builder resists either request, that is information.

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If you are building in Grand Rapids, Holland, Zeeland, Kalamazoo, or anywhere in the West Michigan corridor and you want an independent assessment of what your builder is specifying — or you are a builder looking to understand what a proper foam specification looks like for IECC 2021 compliance and Consumers Energy rebate eligibility — reach out for a free estimate and a straight conversation about what your project actually needs.