Under Grade EPS Insulation

High Density closed cell EPS has massive benefits compared to XPS in every category and produces a much greater R-Value long term as well as longevity in every concrete or below grade scenario.

We offer brand new residential and commercial A-Grade 4' x 8' x 2" in 40 PSI extreme high density for under concrete, under grade, roofing projects or any weight bearing project in which insulation is needed.

Custom sizes from 1/2" up to 6" as well as 60 PSI are available upon request, depending on the quantities ordered.

Check out why Closed Cell EPS is superior to XPS (blue, pink and green board) in every category, from long term R-Value, water retention, longevity and much more.

Please visit the links below and see the results of the 15 year studios showing almost double long term R-Value opposed to XPS. 

• EPS has no dyes & 100% recyclable, making this very Eco Friendly.
• Laminated facing to prevent water penetration and foil facing on the back side for reflecting heat and light (On The Polyshield Products Only).
• ONLY loses up to 6% R-Value, unlike ALL other types of insulation board. (XPS will lose up to 48%, see results of the 15 studies below).
• The ONLY insulation board that gains R-Value as the temperature gets colder! This is huge in the Midwest and colder regions!
• No thermal drift over the entire life of the product.
• Easy to cut & install in any shape and size to fit your needs.
• The best water wicking product on the market! You won't have to worry about moisture damaging your insulation unlike XPS.
• Proudly made in the USA, like every other product Plywood King offers.