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FAQs

Does age affect the thermal performance of VoidForm®?

No. EPS consists of 96%-99% air and 4%-1% polystyrene, and nothing else. Because of its cellular structure EPS is dimensionally stable, and will not settle over time. EPS used and installed correctly does not deteriorate with age and as such is able to deliver constant R values for the life of the building.

Is the RMAX VoidForm® strong?

RMAX VoidForms® are designed to withstand the rigours of installation and concrete pouring.

Prolonged exposure to sunlight will cause a slight discolouration (yellowing) of EPS insulation and cause some surface embrittlement.

Even so, the thermal insulation properties will not be affected unless exposure results in loss of thickness of the EPS boards, although the friable surface can make bonding difficult. For this reason, EPS insulation should be covered to protect it from UV light if it is to be stored in the open for extended periods.

Is the RMAX VoidForm® durable?

Yes. Because EPS is an inert, organic material, it will not rot and is highly resistant to mildew. It also provides no nutritional value to ants, termites, or rodents.

Provided EPS does not suffer mechanical damage or failure of any fittings that may be used, it should have a life equal to that of the building in which it is installed.

Does VoidForm® burn?

Care should be taken to avoid fire sources near VoidForm® installations. If welding or grinding is to occur on top of voids then the hot sparks can represent a fire risk with the EPS.

Like timber, particleboard and other organic building materials, EPS will burn when in contact with a flame.

RMAX recommends the use of Fire Retardant EPS in void construction to minimise the risk of fire.