Thermal Insulation Systems

Suitable for residential

Suitable for light commercial

Suitable for commercial

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The roof is a top priority when it comes to insulating a building.  This is the area you can make the most impact, since warm air rises, most heat is lost through the roof. 

Dimond offer a range of insulation products to complete the roof build-up.


(a) Thermal Insulation Performance Statement

The performance of Dimond thermal insulation systems for roofing and wall cladding is covered by the statement for uninsulated systems together with the additional criteria set out below. 
The use of Dimond metal roof or wall cladding in conjunction with foil underlay, Tasman Insulation NZ Building Insulation Blanket (BIB), or Foil Faced Building Insulation Blanket (FFBIB), can achieve thermal insulation with a reasonable expectation of performance to meet NZ Building Code requirements of:

  • B2 – 50 years durability
  • H1 – Energy efficiency

Design considerations must include:

  • Appropriate combination of foil underlay BIB and foil, or FFBIB to achieve the appropriate R value and light reflection.
  • Allowance for thermal bridging 
    • – via purlins or girts 
    • – via skylights
  • Use of the full thickness of insulation when laid between battens fixed onto purlins, rather than squeezing down onto purlin.
  • Maintenance (and replacement if necessary) of the roof sheeting or wall cladding and fastener components.

The performance is greatly affected by the quality of the installation which requires careful attention to detail to ensure gaps and holes through the insulation are eliminated as much as practicable.

When foil underlay is used as a vapour barrier all laps must be lapped 150mm and fully taped using 3M 425 foil tape 48mm wide.
BIB and FFBIB are designed for use at ambient temperatures and should not be used in conditions where the temperature exceeds 120ºC (e.g. within 150mm of hot flues). The glass wool content of BIB and FFBIB will not burn.

Aluminium foil surfaces must not be exposed to continuous moisture contact, salt laden air, alkalines or contact with dissimilar metals, that will corrode the surface and reduce the insulation and light reflectance performance.

(b) Foil Selection

Reflective foils can be used to increase thermal insulation, reduce daytime heat gain, disperse light within the building, and provide a vapour barrier.

NZS 4200.1 Category

Product Name Duty Reflective Surfaces 1 Reflective Surfaces 2 Vapour Barrier Fire Retardant Abrasion Resistant Surfaces 1 Abrasion Resistant Surfaces 2 Self Supporting
Sisalation 450 Heavy X X X X X X X
Sisalation 430 Medium X X X X X X
Sisalation 420 White Faced Medium X W X X X X
Sisalation 420 Light X X X X X
Sisalation 420 White Ink Light X W X X X
Sisalation 120 Light X X X X
Sisalation 120 Extra Light X X X X
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