When it comes to your home, there is really no room for compromise on finish quality and safety, so we have pulled a short guide together to help you with the due diligence required when planning your living space.
Polystyrene foam has been used as a material for cornice for the better part of two decades, and the material and manufacturing technology has come a long way during this time. We’ve identified some preconceptions and sorted the myths from reality below so that you can enjoy the benefits of a cost effective, easy to use solution with peace of mind.
Cornice Myths vs Reality
Myth: “All foam cornice is imported”
Reality: While most products you encounter would be manufactured overseas and imported, our products are manufactured by DS4 Decor locally, in Melbourne Australia and is certified Australian Made. We also take advantage of a local supply chain, with materials sourced from Foamex Australia, a well know supplier of foam products for the Australian construction industry.
Myth: “Foam cornice is not environmentally friendly”
Reality: Our products actually remove waste from the environment!
Our products are made using Foamex’s Styroboard XPS, which is made from up to 100% recycled polystyrene, diverted from landfill.
Waste polystyrene is collected from communities across Australia, and developed into high-denisty XPS for the Australian construction industry. All manufacturing waste from our process is returned to Foamex for recycling.
Foamex XPS board is entirely free from Hexabromocyclododecane (HBCD), a flame retardant that was commonly used in polystyrene insulation materials. This omission of HBCD is highly beneficial as it promotes a safer and more eco-friendly solution for insulation needs, ensuring reduced potential for harmful chemical exposure and contributing to the overall improvement of environmental sustainability.
It is also CFC-Free and made completely without the use of harmful or ozone depleting chemicals.
Our cardboard packaging is sourced from 100% recycled cardboard.
Myth: “Foam cornice looks cheap.”
Reality: What you see after installation is the profile and the paint finish—not the core material. With a good profile and two proper coats, foam and plaster are indistinguishable from floor level.
Pro tip: Use the same ceiling paint on the cornice for a continuous, shadow‑rich look.
Myth: “Foam cornice isn’t durable.”
Reality: Cornice is a non‑contact trim at the ceiling line. Once it is installed it is almost never disturbed. XPS is dense enough for the job and, once bonded and painted, stands up to everyday life. If it ever gets nicked during install, a dab of filler and paint makes it disappear.
Myth: “You can’t paint foam.”
Reality: You absolutely can—with water‑based primer / sealer / undercoat and topcoats. Solvent‑heavy first coats or some aerosols can attack raw foam, so we strongly recommend only water‑based. For a glossy finish water-based enamel can be used.
Click here for a guide to compatible products
Myth: “Foam melts and gives off toxic fumes in normal use.”
Reality: Indoors, finished and painted foam cornice is stable. Like many building materials, polystyrene is combustible, so keep clearances from heaters/halogens and follow appliance manufacturer guidance. It will decompose with high heat to give off combustion products similar to the toxic combustion products of burning timber (according to CSIRO information).
Low VOC:
Low levels of Volatile Organic Compounds (VOC) may be found in organic materials. The VOC content of our material at 4kg/Cum, is well below the maximum levels of between 14 and 75kg/Cum indicated under IEQ-13 criterion.
More details available in our technical resources
Myth: “Foam cornice is not suitable for bathrooms or kitchens.”
Reality: Fine for wet‑area ceilings when you use moisture‑resistant, foam‑safe adhesive and quality water‑based paint. The XPS core is moisture-resistant and closed‑cell; your protection is the paint film and good ventilation.
Myth: “Foam cornice is only for modern homes.”
Reality: Cornice profiles come in crisp coves, minimalist steps, and heritage‑style profiles. For extremely deep relief and museum‑grade ornament, plaster still shines; for most homes, foam offers the look without the weight.
You can view our entire range here
Myth: “Details won’t be sharp.”
Reality: Modern machining delivers clean lines, smooth curves and consistent faces. If sharpness matters, choose profiles with defined edges rather than very small radii.
Myth: “DIY is hard—leave it to a plasterer.”
Reality: Foam is the most DIY‑friendly option. A fine‑tooth saw or mitre box, solvent‑free adhesive, filler/caulk, sanding block, and paint will get you there. Mitred corners at 45° (or half the actual wall angle if out of square) + a neat caulk line = pro finish.
See our installation instructions here
Myth: “Cornice will make my room feel smaller.”
Reality: Scale is the trick.
- 2.4 m ceilings: 55–80 mm face
- 2.7 m ceilings: 80–100 mm
- 3.0 m+ ceilings: 100–130 mm+
A right‑sized profile frames the room rather than crowding it.
Myth: “It hurts resale value.”
Reality: Buyers react to fit and finish. A straight ceiling line, tidy corners, and a consistent paint film read as quality—regardless of the substrate.
Myth: “Foam attracts pests.”
Reality: XPS is not a food source. It’s sealed with paint and sits at the ceiling perimeter where it isn’t accessible. Interior pest issues almost always stem from unrelated building gaps or food/water sources.
Myth: “Foam yellows and crumbles.”
Reality: Raw foam can discolour under UV, but it’s hidden and painted in use. Quality XPS stays stable; the paint film is what you see and maintain.
Myth: “You can’t use it with LED cove lighting.”
Reality: You can. Many profiles create a light shelf or recess. Observe LED manufacturer clearances and ventilation, and prime/paint the light channel to avoid hotspot reflections.
You can view our LED cornice range here.
Myth: “It can’t handle imperfect ceilings or walls.”
Reality: Foam actually helps—it’s forgiving. Adhesive beads take up minor variation; finish edges with a fine, paintable caulk for a razor line.
In summary, foam cornice is a viable modern alternative to plaster and timber cornice, and is absultely appropriate for your home, whether you’re aiming for a high-end finish or a more traditional look. Best of all, it is cost effective and easy to use!