Thermal Insulation Systems

Performance

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.

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

Tasman Insulation NZ Building Insulation Blanket (BIB) and Foil Faced BIB (FFBIB)


Product Description


Glass Wool Building Insulation Blanket (BIB) and Foil Building Insulation Blanket (FFBIB) consist of long, fine glass wool fibres bonded together with a thermosetting resin to form a lightweight, flexible, blanket insulation. FFBIB is faced on one side with double-sided foil which is lightly adhered to the glass wool. BIB and FFBIB are available in stock sizes, but may be manufactured to special requirements.

Features and Benefits

  • Saves energy by reducing ongoing running costs of the building
  • Non combustible, offering a safer environment
  • Foil facings save installation time
  • Absorbs sound so reduces rain noise and other unwanted environment noise
Product
R Value
Thickness
Size (m)
Pieces
Area (m²)
Foil Facing
Pink Batts BIB R1.2
R Value
1.2
Thickness
50
Size (m)
12 x 1.2
Pieces
2
Area (m²)
28.8
Foil Facing
-
BIB R1.8
R Value
1.8
Thickness
75
Size (m)
8 x 1.2
Pieces
2
Area (m²)
19.2
Foil Facing
-
BIB R2.2
R Value
2.2
Thickness
95
Size (m)
8 x 1.2
Pieces
2
Area (m²)
19.2
Foil Facing
-
BIB R2.4
R Value
2.4
Thickness
100
Size (m)
8 x 1.2
Pieces
2
Area (m²)
19.2
Foil Facing
-
BIB R2.6
R Value
2.6
Thickness
110
Size (m)
6 x 1.2
Pieces
2
Area (m²)
14.4
Foil Facing
-
BIB R2.8
R Value
2.8
Thickness
130
Size (m)
8 x 1.2
Pieces
1
Area (m²)
9.6
Foil Facing
-
BIB R3.2
R Value
3.2
Thickness
135
Size (m)
8 x 1.2
Pieces
1
Area (m²)
9.6
Foil Facing
-
BIB R3.6
R Value
3.6
Thickness
140
Size (m)
8 x 1.2
Pieces
1
Area (m²)
9.6
Foil Facing
-
Flamestop FFBIB R1.2
R Value
1.2
Thickness
50
Size (m)
12 x 1.2
Pieces
1
Area (m²)
14.4
Foil Facing
Fire Retardant
FFBIB R1.8
R Value
1.8
Thickness
75
Size (m)
12 x 1.2
Pieces
1
Area (m²)
14.4
Foil Facing
Fire Retardant

For further information contact the manufacturer.

Non Fire Retardant Foil


Sisalation Building Foils are a light duty, single sided reflective foil laminate recommended for use in commercial and industrial wall applications where the following are required:

  • Low cost reflective inner facing
  • Vapour barrier facing for building insulation blanket
  • Non fire retardant


Features and Benefits


Building foils provide a cost effective highly reflective surface to enhance interior light conditions, while providing low
emissivity to limit heat loss and provide an effective barrier against water vapour entering the insulation and roof space when
the laps are fully taped. Two way reinforced offering strength and with Albar on the reverse face offering a resistance to
scuffing and abrasion.


Applications


Sisalation 110

Extra light duty for economical wall applications, offering low strength resistance where abrasion is not critical


Sisalation 120

Light duty for wall applications, offering better strength and resistance to scuffing

Fire Retardant Foil



Sisalation Fire Retardant Foils are a single side reflective foil laminate. Available in a light, medium and heavy duty laminate weight offering better resistance to exposure to wind as the duty increases.


Recommended for use in commercial and industrial wall and roof applications where the following are required:

  • Effective reflective interior facing
  • Vapour barrier facing for building insulation blanket
  • Fire retardant non combustible material


Features and Benefits


Fire retardant foils provide a highly reflective surface to enhance interior lighting conditions, while offering, in a fire situation, a non-combustible surface which will limit the spread of flame. The foil offers a low emissivity surface to limit heat loss and provide an effective barrier against water vapour entering the insulation and roof space when all the laps are full taped.


Two way reinforced for greater strength and edge tear. Albar surface on the reverse faces offers a better resistance to scuffing.


Sisalation 420

A light duty fire retardant foil for economical wall applications when not exposed to high wind.


Sisalation 430

A medium duty fire retardant foil for wall applications and under roofs where better resistance to wind is required.


Sisalation 450

A heavy duty fire retardant foil for roof applications offering high strength in high wind conditions and best abrasion resistance. Suitable for high humidity applications such as indoor pools. Can be installed on spans up to 1200mm without netting or mesh support.


For further information contact the manufacturer.

White Faced Foil


Sisalation White Faced Flame Retardant Foil laminates have a white face one side and an aluminium foil face the other.
Available in a light duty white ink face or a medium duty white polybar film face.


Recommended for use as an attractive interior exposed lining where a light white fresh face is required under roofing and wall
cladding, and where the following are required:

  • Effective reflective interior facing
  • Vapour barrier facing for building insulation blanket
  • Fire retardant non-combustible material


Features and Benefits


Provides a glossy white surface one side to diffuse and enhance lighting conditions, while offering in a fire situation a noncombustible surface which will limit the spread of flame. Both surface faces offer good scuff resistance and are two way reinforced which, combined with high tear resistance of the edges, limits damage during construction.



Applications


Sisalation 420 WI

A light duty fire retardant foil with a white ink coating on one side. Recommended on walls where damage will be minimal during construction.


Sisalation 430 WF

A medium duty fire retardant foil with a white polybar film on one side. Recommended on roofs of warehouses and factories, but must be fully supported.


For further information contact the manufacturer.

Installation Information



Building Insulation Blanket (BIB) and Foil Faced BIB (FFBIB)

Roofing – Building Insulation Blanket (BIB) and Foil Faced BIB (FFBIB) are designed for use under any roof system which requires control of temperature loss or gain. FFBIB is a true vapour barrier which may be necessary for conditioned spaces. In these cases the lap may be sealed during installation. This may be accomplished using contact adhesive or a tape. A more practical solution for FFBIB is suggested using sealant/mastic. Wherever visible the foil reflects light creating a brighter environment below. Roofing underlay should always be placed on top of BIB, to avoid condensation from the roof underside wetting the BIB.


Where insulation is required to achieve its full R value it must not be laid over the purlins. Insulation must be laid between packers fixed onto the top of steel purlins with a 25mm air gap between roof and insulation. If this is not followed and the insulation is fixed over the top of the purlins and squashed down, the R value will be reduced. There is also a risk the roof will appear bumpy between fixings and the side laps will not fully fit together.


Wall
– FFBIB is installed next to the external cladding (building paper should be placed between the cladding and the insulation) with the foil facing inward, the foil facing will reflect the light where it is visible.


Install the insulation system in a DRY state.


Butt adjacent edges of insulation tightly together and fill all gaps with offcuts to avoid heat leakage.


Fit insulation tightly around all roof penetrations and vent pipes except hot flues where a 150mm gap is required.


Where cutting is necessary use a sharp knife and a straight edge.


Where practical it is considered good practice to incorporate an air gap, for ventilation, between the insulation and the metal deck.



Sisalisation Foil, Fire Retardant Foil and White Faced Foil


Roofing – Lay foil horizontally on netting. White faced foil is laid with the white surface facing down. Start at the gutter line and lap successive layers by 150mm minimum. For an effective vapour barrier seal all openings and laps with an appropriate 48mm adhesive foil tape, such as 3M 425 foil tape 48mm wide


For vertical application lay the foil in the ridge to gutter direction with all laps a minimum of 150mm and sealed with an appropriate 48mm adhesive foil tape, such as 3M 425 foil tape 48mm wide.


Walls – Ensure foil is fixed to the supporting framing with a fastener system that is durable for at least 15 years. Lay and tape the laps as for roofing.

For further information visit www.pinkbatts.co.nz

Rain Noise Insulation Systems


The use of Tasman Insulation NZ Building Insulation Blanket (BIB) overlaid with a breather roofing underlay and in close contact with the underside of Dimond metal roofing can effectively reduce the surface impact noise from rainfall.

The noise reduction achieved has not been measured, but history of use suggests a noticeable reduction can be achieved. For the best results use either 75mm or 100mm BIB.


The effectiveness relies on correct installation whereby the supporting netting is stretched across the purlins to give a sag equivalent to one half of the blanket thickness. The BIB is consequently compressed by the roof sheeting over the total area.


Limitations of this system relate to the need for close contact between BIB and the roof underside and the consequences of a higher risk of corrosion from condensation or leakage moisture retained on the roof underside surface. Compression of the blanket will reduce thermal performance.


Other designed systems by acoustic engineers can be used such as:

  • Building up a layer of 17.5mm plywood and insulation blanket laid over the purlins

or

  • Using imported specialist products to deaden the noise when laid under the roof, such as Wavebar Soundbaffle. It does
    add extra dead weight into the roof system, i.e. 8kg/m2, and is required to be fully sealed like a vapour barrier. For further
    information visit www.soundguard.com.au.