INSULWOOL® for use in rain-screen cladding systems is satisfactory for use as partial fill cavity wall insulation and is effective in reducing the U value (thermal transmittance) of external walls of timer-frame, steel-frame, reinforced concrete frame, or masonry buildings. The product is for use in new or existing domestic or non-domestic buildings. It is imperative that walls are designed and constructed to incorporate the normal precautions against moisture ingress, including the use of a breathable membrane.   

Certain rain-screen cladding systems, such as those with open joints, may require the addition of a breather membrane incorporated into the system. This requirement is determined by the designer and is outside the scope of this Product Technical Statement (V4-0723).   

• Certain cladding and rain screens, such as those with open joints, may require the addition of a breathable membrane incorporated into the system design. The requirement of a membrane is determined by the system designer. 
• Sheathing or bracing for frame elements. INSULWOOL® must not be relied on to provide and structural contribution, e.g., racking strength.
• Resistance to the ingress of perception and moisture from the ground.
• For timber constructions, installation must not be carried out until the moisture content of the frame is less than 20%. 
• The construction should be made weathertight as soon as is practically possible to ensure maximum protection of the INSULWOOL®.  

The following clauses of the NZBC are applicable to INSULWOOL® and it complies with these requirements as explained below.

• INSULWOOL® provides no structural stability to the building and forms part of the cladding or rain screen system.
• INSULWOOL® must be self-supporting and unable to slump in the cavity.

• Durability — B2: Clause B2.3.1 (a) (b) and B2.3.2 (b) Alternative Solution. Meets the 15-year durability requirements of B.2.3.1 (B) with a service life of 50+ years.
  • As INSULWOOD® is confined between the wall and the cladding or rain screen, and has suitable durability, and provided the integrity of the cladding or rain screen is maintained throughout the life of the product then maintenance is not required. 
  • INSULWOOL® is unaffected by the normal conditions in a wall and is durable, water-resistant, and sufficiently stable to remain effective as insulation.  
• Fire Performance – C: Clause C3.4 (a), C3.7 (a) Alternative Solution
  • INSULWOOL® tested to EN13501.1 and has a reaction to fire classification A1
  • INSULWOOL® tested to ASTM E84 Refer to www.thebuildingagency.co.nz