Insulfoam FAQ

Q: Which way does the metallic side of Insulfoam R-TECH face?

The metallic facer on Insulfoam R-TECH may provide additional R-Value if it’s facing a dead air space of 3⁄4″ or more. If there’s no dead air space, it doesn’t matter which way the metallic side is facing.


Q: What is the R-Value of Insulfoam insulation?

R-TECH has an average R-Value of about 3.9 per inch


Q: Can it go directly under drywall?

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


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

Water based, urethanes and polyether’s adhesives work best. Tapes used in weather resistant barrier applications are typically compatible with R-TECH.


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

Quality latex paints and primers should be used for best results.


Q: Can R-TECH be an air barrier, vapor barrier, WRB, semi vapor barrier, water resistant barrier, weather resistant barrier, radon barrier, moisture barrier, vapor retarder?

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 knives or foam saw blades. Check out Insulfoam’s YouTube channel for a full video on how to measure, mark, and cut Insulfoam EPS Insulation.


Q: How can it be fastened to a wall?

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


Q: Will it poison my animals 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 (interior)?

Yes, it’s a great interior insulation solution for both the basement and attic. Check out our YouTube channel for videos on installing
R-TECH in basement and attic applications.

*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.


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