Wholesale Fiberglass Insulation.
You Offer the Service Fee.
We show you the actual wholesale price for vinyl-faced insulation rolls upfront. You indicate the service fee you are willing to pay. Immediate acceptance or denial. No hidden markups.
Add accessories and offer the Service Fee amount to complete order.
(+ $445–$745 shipping + service fee)
Displayed
Service Fee
certified supplier
a delivery day/time.
Shipping
Material
Materials Tested to Meet or Exceed Industry Standards
- NIA
- NAIMA
- ASTM E84
- UL-723
- Factory Mutual
- Class A-1 Fire
- BS 476 Class 0
The only insulation specialist that publishes the manufacturer’s wholesale price.
Outside our parent company, Factory Steel Overstock, no other insulation seller in North America shows you the per-square-foot rate the factory charges before you commit. Every other supplier folds an undisclosed margin into the unit price. We separate it out: factory cost on one line, your offered service fee on another. The math is on the page, not in someone’s back office.
A subsidiary of Factory Steel Overstock · BBB A+ accredited parent company · Insulation specialist since 2024
How Cost-Plus Works
Three steps. Full transparency. You see every dollar.
Calculate the Wholesale Cost
Use the Instant Price Calculator to see the actual factory-wholesale cost of your insulation. No profit has been added.
Offer a Service Fee
You offer a service fee amount you are comfortable with. If the offer is accepted, pay the service fee that same day.
Pay the Certified ASTM Supplier
Receive simple payment instructions for the wholesale material cost, plus applicable taxes. Pay the supplier directly. Delivery 7–14 days.
Four Facings. One Standard: Wholesale.
Each facing serves a different purpose. All are available at the same transparent cost-plus pricing.
VR-R Plus
Vinyl-reinforced vapor retardant facing — the top choice for DIY and professional installs alike.
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WMP-10
White polypropylene facing with a 10-perm rating — solid performance at an economical price point.
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WMP-30
Heavy-duty 30-perm polypropylene facing — the preferred choice of professional installers.
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WMP-50
Premium 50-perm facing with metalized polyester backing — the highest-grade option we offer.
View DetailsInsulation Accessories
Add accessories to your order at the same wholesale-plus-fee pricing model. Most builds need patch tape and either banding or double-sided tape.
Patch Tape
Sealing and repairing insulation facing joints. For repairs, 1 roll covers 15,000 sq ft. To seal, order additional.
Double-Sided Tape
Securing insulation to purlins and girts. 1 roll per 2,000 sq ft.
Banding (with screws)
Metal banding to secure insulation from shifting or sagging with fasteners included. 1 - 500' banding covers 1,000 sq ft surface coverage.
Banding (without screws)
Metal banding — 1 - 500' banding covers 1,000 sq ft surface coverage.
Wholesale Cost + Your Offered Service Fee
Two clear line items. Nothing else. Every quote breaks both apart so you see exactly what each dollar covers.
1. Wholesale Material Cost
The actual factory price for your insulation. Per square foot, multiplied by your total square footage. This is what the manufacturer charges — the same rate national distributors pay. No markup, no commission, no padding. Plus applicable taxes.
2. Flat Service Fee
A single fixed fee that covers our work sourcing the order, coordinating freight, and providing specification support. The amount is based on your material total — published openly in the table below. Same fee for every customer.
A Subsidiary Built for One Product Category
Two years of focused work in a single corner of the building-supply market — backed by the supplier network and operational backbone of a parent company that has been running cost-plus building supply since 2011.
Founded 2024
Founded in 2024, Insulation Overstock was established as a focused subsidiary of Factory Steel Overstock to extend the proven cost-plus model into the fiberglass insulation market. In just two years, our commitment to true wholesale + cost pricing, contractor-direct sourcing, and transparent margins has positioned Insulation Overstock as a leading public outlet for affordable, high-quality insulation products.
Direct Manufacturer Sourcing
Our quotes pull from NAIMA-certified U.S. fiberglass manufacturers we work with directly. The wholesale rate on every order is the rate the factory itself charges — not a distributor markup we paid and pass along.
Specification Depth
Perm ratings, ASTM compliance numbers, IECC zone-by-zone R-value targets, the difference between PSP and PSKP construction — we keep all of it on tap so a first-time buyer gets the same guidance a national distributor would charge a consultant for.
Parent-Company Backing
Insulation Overstock operates under the operational umbrella of Factory Steel Overstock, a BBB A+ accredited business since 2013. Same vetted supplier network, same freight relationships, same payment infrastructure — with the focus narrowed to just the insulation product line.
What Makes This Different
We removed the parts of the insulation buying process that waste your time and money.
Five-Star Reviews from Factory Steel Overstock Customers
Insulation Overstock launched in September 2024. The reviews below are verified customer testimonials from our parent company, Factory Steel Overstock — the operational backbone behind Insulation Overstock’s cost-plus buying model since 2011.
“Easy and honest. A true pleasure doing business with this company. Hard to find customer service of this magnitude in today’s world.”
“After searching for a few days, we finally found a company that has the insulation we were looking for. Thank you FSOS!”
“Excellent service. Straightforward and very easy with which to conduct business. I appreciate his honest approach to business.”
R-Value Reference
All four facings are available in these R-values. Higher R-values provide greater thermal resistance.
| R-Value | Thickness | Typical Use |
|---|---|---|
| R-8 | 2.5" | Light-duty walls, interior partitions |
| R-10 | 3.0" | Standard walls in mild climates |
| R-11 | 3.5" | Standard 2x4 wall cavities |
| R-13 | 3.625" to 4" | Standard walls, moderate climates |
| R-19 | 6.0" | Walls and ceilings, cold climates |
| R-25 | 8.0" | Roofs, ceilings, extreme cold climates |