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Radiant Heat Insulation – Roof Sarking & Sisalation

Radiant barriers & reflective insulation foils

Reflective wall wraps and roof sarking foil acts as a barrier against radiant heat . These types of products are primarily installed in homes to reduce summer heat gain and reduce cooling costs. Reflective insulation foil consist of a highly reflective foil material that reflects radiant heat rather than absorbing it. Reflective insulation together with thermal insulation batts are a perfect combination. Our preferred brand of foil wrap reflective insulation is Sisalation® by Fletcher. Sarking insulation for roofs also has a particularly special roll in stopping condensation dripping down from the underside of metal roof sheets, and down into the ceiling area below. This can be of particular concern in tropical regions where condensation is likely to be an issue.

Secondary Protective Skin

Reflective foil insulation and breather wall wrap products provide a secondary protective skin for your home which can reduce draughts and help make you home more comfortable. Sisalation protects the building structure from the elements prior to the application of the external cladding, and acts as a secondary protective layer against rain and dust after the construction has been completed. Roof sarking has also been know to be used under older roofs, as a kind of insurance against leaks. While this may ‘do the job’ it is of course not the recommended solution to a damaged or leaking roof.

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Foilboard Insulation

Foilboard Rigid Insulation Panels

$ 7.38$ 33.00 p/m2 inc. GST
$ 9.11$ 12.92 p/m2 inc. GST
$ 8.33$ 12.17 p/m2 inc. GST
$ 6.67$ 16.89 p/m2 inc. GST
$ 4.67$ 9.08 p/m2 inc. GST
$ 5.61$ 16.33 p/m2 inc. GST
$ 2.12$ 2.49 p/m2 inc. GST

Reflective Foil Insulation Improves  R-value

Sisalation can provide an additional R-value when installed within an air cavity in the building frame. Call Pricewise Insulation on 1300 729 639 for advice on how you could install bulk thermal insulation in combination with reflective Sisalation or sarking to maximise the thermal insulating effect.

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Breather wall wrap increasingly popular

Where air transfer from each side of the membrane is required and unclassified water barrier properties are acceptable, breather wall wrap products are considered to be the best option. Homes in cooler climates with a high insulation value run the risk of condensation problems in the construction. Breather insulation foils allow the construction to breath allowing possible condensation to escape and dry up. Contact Pricewise Insulation on 1300 729 639 for advice regarding breather wall wrap products and their application.

Reflective insulation foil helps to:

+ protect your home from rain & dust
+ improve on-site work flow efficiency by allowing some internal trades to commence work before the tile and cladding are applied
+ increase the thermal insulation value


In addition to being an effective radiant heat insulation, Fletchers Sisalation Metal Roof Sarking has an added benefit in that it dampens some of the noise from e.g. rain falling on the roof, contributing towards a quieter indoor home environment.

Discount Roof Sarking and Sisalation Wall Wrap

Visit the Pricewise Insulation webshop to purchase reflective insulation foil, Sisalation wall wrap and foil board discount prices.

Get the Right Advice – Contact Pricewise Insulation

While insulation may only account for a small fraction of the total building cost, it is critical that you get it right and avoid the needless cost of having to re-do it at a later date. Essentially insulation boils down to selecting the right product, and ensuring it is properly installed at the right stage of the building project, and preserved from damage until the completion of the building. Sisalation and reflective roof sarking insulation in particular lose some of their effectiveness if the surface becomes covered in dust or grime, so the quicker the building exteriors are completed following the installation of the the insulation, the better!

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