Insulfoam Frequently Asked Questions

Q: Which way does the metallic side face on InsulFoam R-TECH?

The metallic facer on InsulFoam R-TECH may provide additional R-Value if it’s facing a dead air space. If there is no dead air space, it doesn’t matter which way the metallic side is facing. Placing the metallic facer towards an open-air space may allow the material to act as a radiant barrier.

Q: What is the R-value of InsulFoam insulation?

InsulFoam EPS has R-values that vary depending on temperature and the density of the product installed. For instance, our standard R-TECH, sold in home improvement stores, has an average R-value of about 3.9 per inch at 75°F.

Q: Can it go directly under drywall?

Yes. Drywall is a common finish material that can be applied directly over InsulFoam EPS and R-TECH.

Q: What types of adhesives and tapes work with the insulation?

Acrylics, urethanes, and polyether adhesives work best. Tapes used in weather resistant barrier applications are typically compatible with InsulFoam EPS and R-TECH. Refer to our technical bulletin for more information.

Q: What types of paints are compatible with the insulation?

Quality latex paints and primers should be used for best results. Avoid products that contain solvents such as xylene, acetone, etc.

Q: Can R-TECH be an air barrier or Weather Resistant Barrier (WRB)?

R-TECH by nature is an air barrier, and with the seams taped, it becomes a vapor retarder. It is also a moisture barrier, as it is hydrophobic, and is a weather resistant barrier when joints are taped with appropriate products.

Q: Is R-TECH rated for blocking sound?

No, it does little for sound deadening.

Q: What’s the best way to cut the material?

You can use an insulation knife, razor knife, or any other specialty foam knife or foam saw blade. Check out Insulfoam’s full video on how to measure, mark, and cut Insulfoam EPS.

Q: How can it be fastened to a wall?

You can use cap screws, cap nails, adhesives, or minimum 1″-wide staples to fasten insulation to the wall. Check out Insulfoam’s full video on how to install R-TECH on exterior walls.

Q: Will it harm my pets if used inside my house?

No, this material is non-toxic to animals inside the home.

Q: Can it be used in a basement or attic?

Yes, it’s a great interior insulation solution for both the basement and attic. Check out Insulfoam’s YouTube channel for videos on installing:

*Local building codes should be reviewed prior to installation.

Q: Can the material be left exposed?

It depends on the application; it can be left exposed in an attic or crawlspace type of application. Local building codes should be reviewed for exposed interior applications. If it’s an exterior application, it should be covered with some sort of finishing material.