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Sources for Structural Insulated Sheathing (SIS) Products

braun247 | Posted in General Questions on

I found a post from 2018 that listed a few of these,

And have also looked at the Nailbase post by Martin Holladay (2016)

Nailbase Panels for Walls

It seems like there are more companies now.

I have found the following companies that make structural insulated sheathing (SIS) products with their highest R value sheet:

Zip R – R12, poly, seems to used the lower long term cold weather R values

OX-IS – R10, uses Poly, so it is lower than listed value

ArmorWall – R21, poured urethane (waiting on an back from the company about long term cold weath R value), it also really heavy, the lightest 4×8 panel is 92lbs. For refence, 5/8 OSB weighs 66.6lbs.
ArmorWall is a unique one that one might want more info on
Go to the bottom of the and select “Max Facts: ArmorWall Goes Green”

ROK-ON – R10.5, EPS core, surrounded by sheets on both sides

Hunter Panels Xci Ply and NB -R25.8 uses poly, so it is lower than listed value

Barricade® Thermo-Brace® S.I.B – R5, uses GPS

Rmax Thermasheath®-SI – R6 uses Poly, so it is lower than listed value

C-SIS Sheathing – R6 uses Poly, so it is lower than listed value

Does anyone know of any other companies that make SIS’s?
I’m just looking for as many options as I can get.


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  1. GBA Editor
    Kiley Jacques | | #1

    Hi Joe,

    This thread talks in depth about DOW’s SIS.

    1. braun247 | | #2

      Thanks for the link. Based on what I can find online, Styrofoam SIS is now OX-IS. Searching the Duponts website, they do not offer a SIS anymore.

  2. braun247 | | #3

    ArmorWall just got back to me, they use polyurethane, from which I can tell, is the same stuff closed cell spay foam is made of.

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