For Dealers
Stock the below-grade insulation your customers are asking for, backed by our 6-month buy back guarantee.
For Contractors
Fanfold gives you 3x the coverage, fewer seams, and a printed grid for fast PEX install. Faster to lay, easier to tape.
For Homeowners
Get a warmer floor, lower bills, and EPS that holds its R-value over time. Ask your builder for Lexar.
Carried by building suppliers across the country
The Proof is in the Numbers.
The insulation under your slab is the one part of the build you can't fix later. Here's why it's worth getting right.
Of a Building's Energy Loss
Studies put as much as a quarter of a building's energy loss on uninsulated foundations, crawl spaces, and slabs. Insulation under the concrete cuts it down.
Faster Install
One 4x24 fanfold covers 3x the area of a 4x8 sheet. Fewer pieces to carry, a third of the end joints to tape, and no chalk lines.
R-Value Kept in a 15-Year Test
Dug up after 15 years below grade, EPS kept 94% of its R-value. XPS (pink and blue foam board) kept 52%. That's 81% more insulating value left in the ground.
Energy loss: industry estimate. R-value: EPS Industry Alliance, Technical Bulletin 103 (2008), EPS vs. XPS after 15 years below grade, St. Paul, MN. Install speed: Lexar estimate vs. 4x8 sheets.
How it Works
Three steps to a better slab.
Install 4x24 Fanfold
Each piece ships folded into a 4x4 cube and opens to a 4x24 run: 96 square feet at a time. The 6-mil vapor barrier is already on it, so there's no plastic to roll out first.
Printed 6" Grid
No chalk lines. The printed 6-inch grid lays out your PEX, rebar, or mesh and gives you a straight line to cut on. Staple PEX right into it.
Build With Confidence
Pick 15, 25, 40, or 60 PSI to match the load. Tape the seams and build on top, knowing what's underneath keeps working.
What they say after the build
Dealers who stock it, contractors who build with it, and owners living on top of it.
“Lexar’s large fan-fold panels, integrated vapor barrier, 6-inch layout grid, and Preventol® Termite Protection help save time and labor without sacrificing quality. Just as important, the Lexar team backs its products with knowledgeable support and responsive customer service.”
“Lexar Insulation is a game changer. It is easier to haul and install, and it is an excellent product for in-floor heating applications. We install Lexar insulation with every shed floor we sell because of its quality, ease of use, and consistent performance.”
“Whether it’s a professional contractor or a first-time DIY homeowner, customers consistently comment on how easy it is to install and how well it performs. The product quality, customer support, and long-term durability have made it an easy recommendation for us for more than 10 years.”
“It’s been about two years now, and we couldn’t be happier with it. We absolutely love having warm, cozy floors during the winter. If I were doing it again, I’d definitely use Lexar.”