How to Stop Losing Money on Insulation: A Procurement Manager on the Hidden Costs of Batt Insulation

The Numbers That Keep Me Up at Night

I manage procurement for a mid-sized commercial contractor—about 60 field employees, primarily doing new construction and retrofits. Our insulation spend runs around $150,000 annually across fiberglass, spray foam, and rigid board. Nine years into this role, I've tracked every single invoice.

Here's what keeps me up: in 2023, I audited our insulation purchases against actual installed quantities across 14 projects. The average waste rate was 17%. Not theoretical waste—actual product thrown in dumpsters, cut off, or ordered wrong.

That's about $25,000 a year in material we paid for but never used. For a company our size, that's real money.

And the frustrating part? Most of it was preventable.

The Surface Problem: 'Insulation Costs Too Much'

Every GC I talk to says insulation prices are out of control. And sure, the list prices on Johns Manville batt insulation and other materials have gone up. But here's what I've learned: the unit price is rarely the real problem.

When I dig into budget overruns, the story is almost never 'the material was too expensive.' It's more like 'we ordered the wrong R-value' or 'the submittal had the wrong dimensions' or 'we ran short and paid rush shipping on a partial order.'

The price on the data sheet? That's easy to compare. It's everything around the price that bleeds your budget dry.

The Deeper Reasons Your Insulation Budget Is Bleeding

1. The Submittal Trap

Here's a scenario I've seen play out at least six times: project specs call for Johns Manville insulation submittal approval before ordering. The submittal gets approved for, say, R-19 batts in 2x6 walls. Great.

But by the time the order goes in—two weeks later, because approvals always take longer than expected—the GC has redesigned one wall section. Now you need some R-21 in 2x8 studs. But nobody remembered to update the submittal. So the crew orders all R-19, the R-21 section gets installed with the wrong product, and you've got a change order and wasted material.

We had a project like that in Q2 2024. Waste rate hit 22% on that one. The submittal process wasn't the cause—it was the missed update to the submittal.

The lesson: don't just manage the initial submittal. Manage the revisions.

2. The 'Looks About Right' Problem

Fiberglass batts come in standard sizes—but commercial buildings are rarely standard. You've got oddly shaped ceiling cavities, ductwork interference, plumbing runs. The crew cuts around obstacles, and suddenly that 15-batt bundle is producing 11 usable pieces and four scraps.

I don't have hard data on industry-wide average waste from cutting, but based on our tracking across 90+ orders: the waste rate for batt insulation averages 12-15% on typical commercial projects. For complex retrofits, it can hit 25%.

That's not a quality issue with the product. It's a mismatch between standard sizes and real-world conditions.

So glad we started requiring crews to pre-measure and submit a cutting plan before ordering—we cut waste by about 5% just from that one change.

3. The 'Cheapest Product' Mirage

A competitor's product was $0.12 per square foot cheaper than Johns Manville batt insulation on a recent bid. The PM pushed to go with them. I pushed back. Why? Because I've been burned before.

Looking back on our 2022 failure with a budget brand: the fibers were less consistent, more itch complaints from the crew, and five warranty claims from the client when the insulation settled more than expected. The total cost of those claims? $4,200. Savings from the cheaper product? $1,800. Net loss: $2,400.

If I could redo that decision, I'd never let a line-item price difference under 20% drive the choice. But at the time, the budget pressure was real, and I didn't have data on actual failure rates. I do now.

4. The Installation Learning Curve

New crew members waste more material. It's just a fact. On a typical commercial project, I've seen waste from first-year installers run 30-40% higher than from experienced ones. Not because they're bad—because they haven't learned the subtle tricks: how to cut around an electrical box without ruining a whole batt, how to estimate offcuts more accurately.

The investment in training pays for itself within two projects, in reduced waste alone.

The Real Cost of Not Fixing This

Let's put some numbers on it. If your company spends $200,000 annually on insulation:

• At a 15% waste rate: $30,000 in lost material
• At a 10% waste rate: $20,000
• At a 5% waste rate: $10,000

The difference between 'okay' and 'managed well' is $20,000 a year for a company spending at that level. That's not insignificant.

And waste isn't the only cost. There's also:

• Rework from incorrect installations
• Expedited shipping for emergency orders
• Change order inefficiencies
• Warranty callbacks

I track those too. Across our 2023 projects, indirect costs from insulation-related issues totaled $8,700—on top of the $25,000 in direct waste.

The most frustrating part? About 60% of that $33,700 total was caused by the same three issues: submittal revision failures, inaccurate takeoffs, and last-minute design changes. Recurring problems, year after year.

A Simple Strategy That Actually Works

I'm not going to give you a 12-step program. Here's what we did, and it works:

1. Submittal Version Control

We now require that every submittal revision gets a new version number, and the purchasing order references that number. If the approved submittal is Rev C, that's what we order to. No handshake agreements, no 'just swap the R-value on the next order.'

This one change eliminated about 40% of our waste issues in the first six months.

2. Pre-Order Takeoff Verification

Before any insulation order over $2,000, a senior crew member does a physical takeoff and compares it to the submittal. We catch mismatches before the order goes in, not after.

Since implementing this in Q3 2024, zero submittal-to-order mismatches. Before that, we averaged one per quarter.

3. Buy the Right Product the First Time

Johns Manville products cost more upfront than some alternatives. But when we ran the numbers over six years of cumulative spending across 90+ orders, the total cost of ownership for JM products was lower than budget brands in every case where we tracked full lifecycle costs.

Why? Fewer complaints from the crew, fewer callbacks, and more consistent quality that meant less waste on the jobsite.

I wish I had tracked performance data from the beginning. What I can say anecdotally is that switching to JM as our primary vendor saved us about 12% in total costs compared to our previous mix of suppliers—even though the per-unit cost was 8-10% higher.

4. Invest in Installation Training

We run a half-day training session for every new hire, focused on material handling and cutting techniques for Johns Manville batt insulation and other products we use. Cost: about $2,000 a year in trainer time and materials. Savings in reduced waste: roughly $4,500 a year.

Not a bad return on investment.

The Bottom Line

Insulation costs aren't going down. Material prices, as of early 2025, have stabilized but remain high relative to pre-pandemic levels. You can't control the market.

But you can control how much of what you buy actually ends up installed where it belongs. And that 15-20% waste reduction? That's real savings, every year, without fighting a single vendor on price.

The question isn't 'which insulation is cheapest.' It's 'how do I get the most value out of every dollar I spend on insulation?'

I've found my answer. Yours might look different—but I'd bet the root cause of the waste is the same.