GUTEX Thermoflex®

Flexible woodfibre insulation board

  • 30
  • 40
  • 50
  • 60
  • 80
  • 100
  • 120
  • 140
  • 160
  • 180
  • 200
  • 220
  • 240
  • 1350x575 mm

λD (W/mK) 0,036




  • Between-stud insulation in timber frame, post and beam interior and exterior wall structures
  • Between-rafter insulation
  • Ceiling insulation
  • Partitions/ drywall structures
  • DIN 4108-10: DZ, DI-dk, WH, WI, WTR

Technical Data

GUTEX Thermoflex®

  • Drastically stronger fitting
  • Incredibly less dust
  • Long-lasting, highly effective insulation
  • Pleasant to touch and handle, making it a pleasure to use
  • High quality look thanks to exceptional homogeneousness
  • Declared thermal conductivity 0.037 W/mK delivers superior insulation performance via minimum raw density
  • Suitable for just about any wood construction thanks to a diverse selection of thicknesses and sizes
  • Cuts to size significantly quicker and cleaner
  • High dimensional precision and stability
  • Lightweight and flexible like you would expect from batt insulation 
  • Fits great, insulates great!



                  Certificates & Test marks

                  • keymark-thermoflex-2017
                  • emas-143-00002-din14001-2009-de
                  • tuev-12853-iso9001
                  • ce-04
                  Technical Data

                  Please follow the following instructions carefully:



                  • Store and install this product dry.
                  • Protect this product against moisture.
                  • Do not stack the pallets one upon another.
                  • Cut with power handsaw, jigsaw or GUTEX Thermoflex knife.
                  • Vacuum off the dust in accordance with applicable workplace safety regulations or practices.
                  • Use either masonry or metal drill at highest rpm.
                  • A hole saw may be used to cut holes for flush electrical sockets or holes for pipes.
                  • GUTEX Thermoflex can stand up to temperatures up to 100 °C for an extended period of time. However, avoid exposure to open flames. In addition, we suggest the use of a suitable means to encapsulate sources of heat, such as installation sleeves for recessed lighting fixtures, etc.

                  Between wood studs or joists

                  • Cut oversized in both length and width and wedge into place.
                  • Oversized dimensions ensure tight joints.
                  • For best sound insulation performance, fill wall spaces with GUTEX Thermoflex interior up to 80 percent.
                  • To minimise waste, two pieces can be wedged in next to each other, but make sure the pieces have the appropriate oversize.
                  • Depending on the construction, the state of the rafters/joists as well as the roof pitch, you may have to adjust the above figures by increasing or decreasing them slightly.
                  • We suggest cutting the insulation 1 % ≥ the width of the cavity and the overall length of the space.
                  • Sheets installed in roofs or ceilings have to be secured within three days to prevent them from falling out of the structure in which they are installed.
                    Between metal studs
                    • The metal studs are flat on one side and u-shaped on the other side to hold the board. With the exception of the very last upright, all of the uprights (studs) are installed with their u-shaped openings pointing in the same direction. The last stud installs, so that it faces the opposite direction. The board that fits into this upright must be installed first.
                    • Insert the insulating board, position the stud, and fix in place.
                    • Install the remainder of the boards.