Light Industrial / Commercial Spunsulation

Spunsulation Radiant Barriers are a range of products manufactured for all sectors of the construction industry, that require reflective insulation foils for roofing ,walling and insulation applications.

These products are manufactured by laminating a non-woven polypropylene spunbond membrane to highly reflective aluminium sheets which create a technologically advanced product with high-performing physical properties (see spec sheet).

Spunsulation Radiant Barriers have the normal functions of technical roofing membranes, but provide the added benefit of being a reflective insulation material, which adds to indoor comfort and reduced energy consumption.

Light Industrial / Commercial Spunsulation is utilised in commercial buildings such as offices, shopping centres, schools and community halls that are constructed with a pitched roof.

GSM
Test Method> NWSP 130.1.R0 (15)
Product Building Regulations Requirements Certification
Commercial / Light Industrial Double Sided Foil A13(1)(a) Materials Agrement 2020/605 159
R-Value (m2.K/W  Tensiles (N)  Elongation (%) 
SANS 1381-4:2013 NWSP 110.1.R0 (15) NWSP 110.1.R0 (15)
Product MD CD MD CD
Commercial / Light Industrial Double Sided Foil 1.52 140 140 70 70
Resistance to tear (N)  Hydrostatic head (mm) 
NWSP 110.1.R0 (15)  Spunchem
Product MD CD
Commercial / Light Industrial Double Sided Foil 140 140 >2000

Spunsulation – Radiant Barrier

In order to be classed as a radiant barrier, the product should reflect between 95% and 97% of all radiant energy. This means that the radiant barrier would have an emissivity of between 0.05 and 0.03.

Emissivity of Building Materials
Material Surface  Asphalt Aluminium Foil Brick Concrete Glass Fibreglass/ Cellulose Wood Silver Enamel Paint (black/white) Lacquer Paint (black/white)
Emissivity 0.90-0.98 0.03-0.05 0.93 0.85-0.95 0.95 0.8-1.0 0.90 0.20 0.91 0.80

To understand the relevance of this, we need to look at the different types of heat transfer that occur, namely CONDUCTION, CONVECTION and THERMAL RADIATION. Thermal radiation is responsible for between 90% and 93% of radiant heat that is transferred in a downward flow from the roof, and up to 80% of the heat transfer through side walls of the building, [Fig. 1.1] while conduction and convection play a nominal role.

Reduce Energy Costs

Spunsulation Radiant Barriers reduce energy costs by reflecting radiant heat energy by utilising the amazing reflective properties of aluminium. This works well (but oppositely) in both summer and winter months by keeping the heat from moving through the barrier [Fig. 2.2]. Spunsulation Radiant Barriers are not like bulk insulation, which slows down or resists heat transfer because of its mass.

Heat Flux Reduction Graph

The graph below shows the amount of heat flux entering the roof space per m2 while trying to maintain the room temperature at 25oC using an air-conditioner.

The uninsulated roof has an average heat flux of 3000kJ/m2 while Spunsulation Radiant Barrier has an average heat flux of 2000kJ/m2.

The difference in heat flux is thus 1000kJ/m2 between the two installations, indicating that a third less heat energy has entered the roofspace.

The Spunsulation Roofing Radiant Barrier is to be installed by contractors and roof erectors in accordance with the Building Regulations of South Africa. Click here for the installation guide.

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