FDW must be fitted without gaps around ducting; edgesto be overlapped and sealed with tape. Where being used to control condensation, the ducting wrap must be fully sealed to prevent moisture ingress. deviations from the above must be cinsulted with the application, FDW may also require fixing with fire (penetrations with fire retardant adhesive and/or mechanical fixing penetrations through the vapor barrier are to be sealed completely)

Fiber thermal:

- From 80gm to 800gm
- From 5mm to 8cm
Heat and sound insulation