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SERVICES
Welcome to Wren Industries Pty Ltd
Wren Industries is a family owned business, based in Melbourne, Victoria. It commenced trading in 1991 and is operated by Tim Renouf. Wren manufactures two aluminium foil radiant heat barrier insulation products – CONCERTINA FOIL BATTS and RENSHADE. The Renouf family have been involved in the manufacture, marketing and sales of foil insulations since the early 1950’s.
Application
Understanding what the best insulation for different Australian climates can be very difficult. The public are mostly indoctrinated that bulk is better, and thicker is better still. It is common to find fibreglass company advertising mentioning only batts and vague detail (or none at all) about their range of foil products. The consumer is not informed about how foil insulations work and are left ignorant or
confused. Why? Because the fibreglass manufacturers have more capital investment in manufacturing fibreglass than foil – and more profit can be generated from fibre-glass than foil.
The selection of the right material or combination of materials will depend on location and climate.
In hot climates, reflective foil laminates are clearly the correct choice as bulk insulations are not radiant heat barriers but rather radiant heat absorbers, which slow down the transfer of heat (relatively low level at 33degC), store it, and then slowly release the heat when cooler periods arrive. And bulk insulation in ceilings causes yet other problems – it traps summer heat within rooms from escaping, as revealed in a 1981 federally funded insulation research project undertaken across Queensland.
Refer http://www.concertinafoilbatts.com/compar.htm
High temperature frequently causes refrigerative cooling (and ductwork insulation) to be under severe heat strain, operate longer and consume high levels of electricity, to the point where total power demand exceeds supply and blackouts occur. Refer http://www.concertinafoilbatts.com/belic/css/belic.htm - http://www.concertinafoilbatts.com/press.htm
When demand is high, peak pricing occurs adding greatly to annual power bills. And greater energy use contributes to ever increasing levels of national greenhouse gas emissions, which Australia is committed to reduce.
The greatest and longest daytime radiant heat loads occur on roofs. Sloping or cathedral roofs with narrow cavities are a particular problem to correctly insulate. When roofing foil insulation is installed it needs a minimum 50mm downward airspace to work at near maximum efficiency and any type of bulk insulation must not fill the cavity and touch the foil, otherwise radiant heat can penetrate the fibres, exceed the 33degC test conditions and cause a substantial drop in summer R-value.
CEILINGS - PITCHED ROOFS
- FOIL BATTS simply laid over fibrous insulation (33deg tested R value) maintaining concertina air spaces.
- Do not pull tight.Dust irrelevant on top surface - bottom triangular foil airspaces emit or re-radiate approx 3% of all summer heat.
- Ceiling temperatures reduced by approx 5-10 deg, depending on thickness of existing insulation.
- Extra R Value = approx R1.0 down/summer, R0.5 up/winter.
- Extreme radiant heat from roof is stopped, creating comfort in the rooms below.
- Reduces air conditioning running costs.
FLOORS
- New and existing floors - overlapped and stapled to joists with min 50mm airspace = Total R3.1
- 97% radiant heat flow down - reflected back to maintain warmer floor temperature
- Create still air above and below FOIL BATT. Enclosed perimeter walls (eg brick veneer or shade cloth behind base boards). Open perimeter walls - use floor joist underlining
- Joist tops clear for gluing and cramping of flooring
- Easier than draping foil or supporting fibre batts with chicken wire
- Perforated FOIL BATTS allows floors to drain possible moisture and assists in breathing of timbers. Recommended for use by Timber Promotion Council (VIC)
Service Categories
Insulation, Ventilation
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