Styrofoam™ Brand Deckmate™ Plus

Commercial | Residential | Multifamily | Wall

Cover all the bases on low-slope roofs

On low-slope roofs, DuPont™ Styrofoam™ Brand Deckmate™ Plus Extruded Polystyrene Insulation helps resist moisture and freeze-thaw impacts while eliminating the need for a thermal barrier.


Styrofoam™ Brand Deckmate™ Plus

A durable foam insulation board with shiplap edges, DuPont™ Styrofoam™ Brand Deckmate™ Plus Extruded Polystyrene Insulation is easy, fast and flexible to use. The Styrofoam™ Brand XPS product line gives you the proven thermal and moisture performance of the original XPS, plus the product options you need to design and build energy-efficient, resilient structures all the way to the top. It’s lightweight and easy to install, which makes the work go faster, and it’s readily available through our wide distributor network. When and where you need it, Styrofoam™ Brand is there.


Features & benefits

Lightweight and durable
  • Easy to handle
  • Reduces waste
  • Resists damage
  • Closed-cell structure
  • Excellent freeze-thaw resistance
  • Excellent insulating characteristics
  • High moisture resistance
  • Direct-to-deck application
  • Easy, fast, flexible use on site
  • Eliminates need for thermal barrier to keep costs down
  • Boosts energy performance
  • Cost-effective

    Physical Properties

      Method Unit Value
    Thermal Resistance per inch (25 mm) @ 75°F (24°C) mean temp.<sup>1</sup> C518 ft2 •h•°F/Btu (m2 •°C/W), R-value (RSI)(1) 5.0, 0.87
    Compressive Strength<sup>2</sup> D1621 psi (kPa), min. 25, 20 (140)
    Flexural Strength<sup></sup> C203 psi (kPa), min. 50, 43.5 (300)
    Water Absorption<sup></sup> C272, D2842 % by volume, max. 0.3, 0.7
    Water Vapor Permeance<sup>3</sup> E96 perm @ 1” thick perm @ 2” thick 1.5 (90)
    Dimensional Stability, max<sup>5</sup> D2126, CAN/ULC S701 % linear change, max. 2
    Coefficient of Linear Thermal Expansion<sup></sup> - x105in/in °F (x102mm/m °C) 3.5 x 10-5 (6.3 x 10-2)
    Maximum Use Temperature<sup></sup> - Fdays
    Flame Spread<sup>4</sup> E84 Fdays 1.5
    Smoke Developed<sup>4</sup> E84 Fdays 165

    1 R means resistance to heat flow. The higher the R-value, the greater the insulating power.

    2Vertical compressive strength is measured at 10 percent deformation or at yield, whichever occurs first.

    3Based on 1” (25 mm) thickness.

    4These numerical flame spread and smoke developed ratings are not intended to reflect hazards presented by this or any other material under actual fire conditions.

    5Tested at 158°F/97% RH/7 days.


    Available Sizes

    Length Width
    0 0
    96 48
    96 48
    96 48
    96 48