Is Rmax Thermasheath-XP an acceptable alternative to Dow Thermax?
![](https://secure.gravatar.com/avatar/835715853d5db2521efdb1d8a04901a6?s=52&d=https%3A%2F%2Fimages.greenbuildingadvisor.com%2Fapp%2Favatars%2F200x200%2Fn.png&r=g)
I intended on using Dow Thermax for an exposed basement application in a residential setting.
I thought there were no alternatives without using an ignition barrier (drywall) but recently came across Rmax Thermasheath-XP. For my purposes, I believe this would be a more affordable option.
https://www.rmax.com/thermasheath-xp/
Does anyone have any experience with this product? It seems to have similar properties to Dow Thermax. Does Dow Thermax have any documented advantages?
Thanks!!
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
![](https://www.greenbuildingadvisor.com/app/themes/greenbuildingadvisor/dist/img/modules/detail-library/thumb1.png)
![](https://www.greenbuildingadvisor.com/app/themes/greenbuildingadvisor/dist/img/modules/detail-library/thumb2.png)
Replies
Natepa,
According to the manufacturer's claims, it should work. But check with your local building inspector before you buy the materials -- just to make sure your inspector agrees.
All of the polyiso manufacturers seem to have an equivalent product.
Some others I've found:
R-Max TSX-8500 & TSX-8510
Johns Manville CI Max
Hunter xci 286
but they seem to be even harder to source than Thermax, which is probably why they aren't mentioned much.