DriStud FRU38 Roof Underlay

220gsm Fire Retardant Vapour Permeable Synthetic Self-Support Roof Underlay

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Overview

DriStud FRU38 is a white synthetic tri-laminate roofing underlay that is water resistant, vapour permeable and fire retardant. The FRU38 is a self-supporting, roof underlay. It is intended for use on new and existing buildings in wind zones up to and including ‘Extra High’, as defined in NZS 3604:2011.

DriStud FRU38 is a Heavier grammage self-support roof underlay, whereas DriStud FRU36 is a lighter grammage self-support roof underlay.

Resources

PropertyStandardValue
Weight220 ±5 g/m2
UV ExposureASTM G15420 days
Roll Sizes (m²)1250mm x 40m (50m²) : 2500mm x 40m (100m²)
Flammability indexAS1530.2-19931
Fire RetardantYes
Water Vapour ResistanceASTM E96 Procedure B0.167 MNs/g; Pass
AbsorbancyAS/NZS 4201: Part 6Requirement ≥150 g/m²; Pass
Air ResistanceBS ISO 5636-5:2003≥0.1 MN s/m³; Pass
Air BarrierYes
Water ResistanceAS/NZS 4201.4:1994≥100mm H₂O; Pass
SupportedSelf Supporting
Roof Pitch˃ 3°

Available Sizes

ROLL SIZES
1250mm x 40.0m (50m2)
2500mm x 40.0m (100m2)
FRU38 - Fire Retardant Roof Underlay
923324547
846635365

Warranty

TCL Hunt Ltd warrants that all DriStud roofing underlays will be free from manufacturing defects. Upon receiving of DriStud roofing underlays, it is recommended that a visual check is made. Where defects are observed, these will be replaced at the discretion of TCL Hunt, provided that they are returned to point of purchase.

If installed in accordance with TCL Hunt installation requirements, TCL Hunt warrants that DriStud roofing underlays will comply with all relevant provisions of the NZ Building Code. DriStud roofing underlays will have a serviceability equal to that of the roof cladding provided that:

  • the balance of the external wall is installed in accordance with the NZ Building Code, and,
  • all necessary maintenance is undertaken in respect of the external wall system.

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