Gutex Ultratherm Roof Insulation and Underlayment

Credit: Four Seven Five

What makes this product green?

  • Reduces heating and cooling loads
  • Avoids hazardous ingredients


Ultratherm is a moisture-resistant, rigid roof insulation and underlayment made from 95% wood fiber, 4% polyurethane binders, and 0.5% paraffin. Manufactured in Germany, these panels are engineered with tongue and groove edges to improve weather resistance and ease of installation. These panels act as a subroof for pitches greater than 15° without need for taping the tongue and groove or sealing nails, according to the company. The 2-3/8"-thick, 86.6"-long, 29.5"-wide panels have an R-valueMeasure of resistance to heat flow; the higher the R-value, the lower the heat loss. The inverse of U-factor. of 3.4 per inch and a perm rating of 18. Custom sizes are available.

Manufacturer Information

Four Seven Five
131 Union St.
Brooklyn, NY 11231
Phone: 718-622-1600

Listed in: Board Insulation