Eco Shield™ Insububble is a four layer laminate which utilises

  1. the foil layer for reflective insulation
  2. a laminating layer
  3. a spunbond layer for stability, strength and thermal insulation and
  4. the polyethylene bubble layer for additional insulation.

The product is aesthetically attractive when applied under metal roofs. Insububble can be used under domestic or industrial roofs. It is flame retardant and carries the SANS 1381-4 mark Class E. Tested in terms of SANS 10177 the product has been classified as class B/BI/2/H which means it has a superior flame retardancy and can be used in any structure with a B1 rating with sprinklers. The product has been tested with sprinklers.

Insububble has a strong tear resistance and will not expand when in contact with changing roof temperatures as in the case with other bubble type insulation membranes which consist mainly of polyethylene layers.

Insububble is dimensionally stable and easy to work with.

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Installation Instructions

1) Domestic specifications
One layer of Eco Shield Insububble over rafters and under battens. Lay Eco Shield Insububble longitudinally over the rafters working from the eaves to the ridge and lapped 150 mm at joins.

2) Industrial specifications

Fix strainer wires from ridge to eave purlins at 300 mm to 600 mm centres depending on the application. The wires must run on top of the purlins. Lay Eco Shield Insububble over the strainer wires from the ridge to the eave. Secure Eco Shield Insububble to leg face of top purlin, pull taught down to the eave and fix to bottom purlin. The Eco Shield Insubble should be overlapped 150 mm at each joint to ensure that the strainer wires support each lap.

Special precautions

The foil layer has a poor resistance to acids and alkalis and must not be used in contact with wet concrete or be exposed to a corrosive environment. Unless special precautions are taken, the atmosphere in the roof space can cause corrosion of the foil layer that will directly effect its emissivity and therefore its thermal insulation properties.

Technical specifications

Data Unit Value
Class E
Form Roll
Length m 40 m
Width mm 1250 ± 5%
Thickness mm 1.56 ± 5%
Mass per unit area g/m2 360 ± 10%
Resistance to delamination

  1. Dry at elevated ambient temperatures
  2. Wet at elevated ambient temperatures
  3. Resistance to corrosion

No delamination
No delamination
No corrosion

  1. Machine direction
  2. Cross machine direction
Emissivity <0.05
Water vapour permeance:
Reflective surface facing dessicant
g/(s.MN) <0.002
Fire performance:
Tested in terms of SANS101 77-11
Class B/B1/2/H only
Tensile breaking strength:

  1. Machine direction
  2. Cross machine direction
Bursting strength kPa >586
Puncture resistance mJ >3316
Edge tear resistance

  1. Machine direction
  2. Cross machine direction
System thermal resistance:
(Two air gaps – heat flow down)
(m2.K)/W >0.90