Maintenence and Durability
Due to its many industrial uses there are many questions about the maintenance of geofoam and how it holds up in specific climates and weather conditions. Geofoam, like any kind of EPS foam (expanded polystyrene), needs very little maintenance when it has been constructed properly. Geofoam, first and foremost, is a terrific insulator and may be used in the masonry walls of basements. Being a non-organic substance animals rarely consume it, but its comb-like structure does make it a viable housing nest for insects and termites specifically in wooded areas. However, contractors can prevent infestation by covering the geofoam in appropriate material per the manufacturer’s instruction.
Geofoam doesn’t absorb moisture very well and research indicates there is less than a 10% absorption rate during its lifetime. If the material has been compromised and moisture is absorbed, then it can significantly increase the chance of degradation of the foam. Geofoam’s low absorption rate also creates some inquiries about how it reacts in temperatures that dip below freezing: specifically in regions of the country where differential freezing is a problem. Differential freezing is when parts of the road become frozen and other parts are not. This causes numerous accidents because most drivers are unaware of this problem. Because of its thermal properties, geofoam stops heat from escaping and prevents frost penetration. Parts of the road that do and do not contain geofoam may result in differential freezing. Engineers who increase the ability of the base to allow ground heat to flow can reduce the chance of differential freezing occurring.
There is also concern about the effects of ultraviolet radiation on geofoam as well. Specifically during times when the geofoam must be stored until the next part of the construction project can begin. Geofoam that is exposed to ultraviolet radiation tends to degrade and reduce the friction between it and other materials in the foundation. Covering geofoam with an opaque sheeting material can prevent degradation: specifically with open-air storage. Gaps between layers of geofoam can also create stress and can decrease the lifespan of the pavement. Proper geotechnical engineering can put a stop to this potential problem.
