This brochure describes the frost insulation of ground and civil engineering works using STYROFOAM* extruded polystyrene insulation from Dow. It covers the principles, design considerations and installation methods for frost and permafrost insulation.
The recommendations contained in this brochure should always be considered in conjunction with guidance from the relevant authorities and any local regulations.
INSULATING GROUND WORKS
Sweden is a country with great climatic variations and temperature differences. The whole country is subject to ground frost, which in the North can reach depths of 2m. In some types of soil ground frost can produce frost heave – frost induced soil movement and expansion – which can damage roads, railways, service pipes and building foundations.
An effective method of protecting these structures is to insulate them with STYROFOAM, which reduces the risk of frost damage and cuts the associated repair and maintenance costs. This method of protection is often simpler and more cost effective than the alternative of forming deep gravel filled foundations.
STYROFOAM boards are available in several types and sizes, enabling designers to match the properties of the insulation to the intended use and the environmental conditions.
The severity of winter conditions is measured by the frost index, the total of daily average temperatures below freezing (number of days x temperature below zero, expressed in negative degree days). The map shows the climatic zones of Sweden based on the mean frost index.