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FAQ

The section below contains frequently asked questions regarding heating and RPS. If you haven’t found the answer to your question, feel free to contact us directly.

Do you know how polystyrene is created and what a wealth of applications it can be used for thanks to its unique properties? Watch our short video “The Story of Polystyrene”:

I want to heat a family house. What kind of insulation should I select?

Generally, we recommend that you use the ETICS contact heating system; you have several materials to choose from, which are available on the market and intended for this kind of application. Whether it’s EPS, mineral fibre or PUR/PIR foams, always choose the materials based on their utility properties in terms of value for money. The comparison of invested resources relative to the return of investment is essential when choosing the insulation type.

I want to heat a family house. What kind of polystyrene should I use for facade heating?

EPS 70 F is the optimal and most frequently used for contact heating systems. In case lower insulation thickness is required but with the same thermally insulating properties, you can also use EPS NEO 70 or EPS 100 F with higher strength. For recommended applications of foam polystyrene, sorted by type and application, see page 12 of our catalogue.

I want to heat a family house floor; what is the optimal polystyrene thickness?

EPS 100 or higher is suitable for floor insulation. In addition to your own requirements, the thickness should also be in conformity with ČSN EN 730540 and the EPBD II directive. The optimal decision is to devise balanced heating for the entire building envelope with good return of investment, which is something the project engineer can help you with. For informative EPS thickness values for individual designs, see page 2 of our catalogue.

If your project documentation has a minimum heat resistance R or a maximum heat permeability coefficient U specified, you can find the corresponding thickness values for individual EPS types on page 10 and 11 of our catalogue.

The thermal conductivity coefficient values for individual EPS types are included in the technical sheets on page 4 and 5 of the catalogue.

Is it true that house heating increases the risk of mould forming?

Actually, quite the contrary as long as outer heating is used.

The heating significantly or entirely reduces the condensation of water vapours within the structure. The temperature at the inner surface of the circumferential walls is higher and therefore further from the dew point, which in turn prevents mould formation. Potential mould problems are not due to the outer heating, but rather lack of heating of significant thermal bridges within the structure (e.g. window cases), as well as with lack air circulation (insufficient ventilation), which would otherwise contribute significantly to the water condensate evaporation.

Is it necessary for the polystyrene to “breathe” when used as facade thermal insulation?

On the contrary. The insulation either “breathes” or provides thermal insulation. A contact heating system (whether based on EPS or cotton-wool) is enclosed on the outside by an impregnable material (plaster, fine mortar, water insulation), which is why its air (as well as moisture) permeability is rather undesirable due to the condensation of water vapour with the cold surface. House walls generally let through a maximum of 4% of air with the internal moisture, which is why a vast majority of the moisture always needs to be ventilated. For example, wooden buildings have a structure fitted with steam insulation, which completely eliminates the “breathing” of the wood. EPS is among materials with medium water vapour permeability (m factor = 20–50).

Is polystyrene safe to human health?

Yes, EPS is safe for human health, stable and a biologically neutral material, which is commonly used with food in its other forms. Using it as an insulation material will get you a safe, functional and comfortable home with minimum costs.

What do I do with the remainder of the polystyrene from the construction? Is it recyclable?

The foam polystyrene (EPS) can be recycled very well in up to 7 cycles, which is why its storage is neither reasonable nor desirable.

That’s why we recommend that you make use of the services of your local junk yard. The yards typically collaborate with companies that use the material for further processing.

At the junk yard, the HBCD fire retardant contained in EPS could possibly be a limitation. However, our products do not contain HBCD and the foam polystyrene is classified as a 170604 class waste.