Hydra Classic Wall Underlay

HYDRA Classic Wall underlay is a premium flexible synthetic underlay designed to be used behind exterior cladding systems.

It acts as a secondary weather-resistant barrier, protecting the building envelope from water ingress while allowing the safe passage of water vapour, contributing to a dry and durable wall assembly.

• Can be used with absorbent and non-absorbent claddings.
  
• Can be used with direct fix cladding and cavity applications.
  
• With masonry veneer in accordance with NZBC Acceptable Solutions E2/AS1 and E2/AS4.
  
• Can be used in all wind zones up to and including extra high when used with Rigid Air Barrier systems.
  
• Can be used as an air barrier in unlined spaces, such as attic spaces.

Product Code Roll sizes Coverage

• HYCL1370 1370mm x 37m 50m2
  
• HYCL2740 2740mm x 37m 100m2

• 19313 Marshall Innovations Classic Wall Underlay Pass V1 2 Exp 11 2025 (352 kb)
• 27309 Marshall Hydra Classic Performance Properties Info Flyer V2 (966 kb)
• Bpir Submission 13255 1755548986 HYDRA CLassic Wall Underlay (177 kb)
• Hydra Classic Wall Underlay Brochure (1 mb)
• Hydra Classic Wall Underlay Install Guide (1 mb)
• Hydra Classic Wall Underlay Product Warranty (122 kb)