In New Zealand, roofers typically use various methods for insulation installation to ensure energy efficiency and thermal comfort in buildings. Some commonly used insulation installation methods by NZ roofers include:

  1. Blanket or Batts Insulation: This method involves installing pre-cut insulation blankets or batts made of materials such as glass wool or polyester. The insulation is laid between the ceiling joists or roof rafters, creating a barrier that reduces heat transfer.
  1. Blown-in Insulation: Blown-in insulation, also known as loose-fill insulation, involves using a machine to blow loose insulation material, such as cellulose or fiberglass, into the roof cavity. It is particularly useful for hard-to-reach areas or irregularly shaped spaces.
  1. Insulation Board Installation: Insulation boards, typically made of rigid foam insulation materials like polystyrene, can be installed on the interior side of the roof. They provide a continuous insulation layer and can be affixed to the roof decking or installed as a secondary layer beneath the roofing material.
  1. Spray Foam Insulation: Spray foam insulation involves the application of a liquid foam insulation material, usually polyurethane, onto the roof surface. The foam expands and solidifies, forming a continuous layer of insulation that fills gaps, cracks, and hard-to-reach areas.
  1. Reflective Foil Insulation: Reflective foil insulation consists of a layer of reflective material, often aluminum foil, sandwiched between layers of insulation. It is commonly installed under the roof rafters or on the roof decking to reflect radiant heat and reduce heat gain or loss.

The choice of insulation installation method may depend on factors such as the type of roof, available space, insulation material preferences, and the building’s specific requirements. It’s important to consult with a professional roofer or insulation contractor who can assess your building’s needs and recommend the most suitable insulation installation method.

Additionally, it’s worth noting that New Zealand has building regulations and standards, such as the New Zealand Building Code and the Energy Efficiency and Conservation Authority (EECA) guidelines, which provide guidance on insulation requirements and installation practices to achieve optimal thermal performance. Compliance with these regulations is crucial for ensuring energy efficiency and meeting building code requirements.