Structural Insulated Sheathing

STYROFOAM SISâ„¢ Brand Structural Insulated Sheathing from Dow
Make A Big Difference Without A Big Change

Without adding a single step to the construction process, achieve new levels of efficiency in every home you build: efficiency of design, efficiency of effort and perhaps most important, efficient use of energy required for heating and cooling.

Product Overview

The innovative STYROFOAM SISâ„¢ Brand Structural Insulated Sheathing from Dow combines three functions in one product:
  1. Structural lateral bracing and transverse loads
  2. Significant insulation performance
  3. Water-resistive barrier
A first-of-its-kind product, STYROFOAM SISâ„¢ Brand Structural Insulated Sheathing is the result research, development and rigorous testing. And professional builders have used it with strong success.
Ready to make a difference without a big change? We're braced for your questions.

Wall Bracing Resource Center

SIS House

Dow has summarized the "rules" related to Braced Wall Lines under the International Residential Code to help you place STYROFOAM SIS™, as well as calculate the amount of sheathing needed for your residential project. See the Wall Bracing Resource Center.
STYROFOAM SISâ„¢ Brand Structural Insulated Sheathing Awards