Is EPS suitable for a building with intermittent heating?

A permanently heated office may lose heat to an adjoining unheated store. Include the dividing wall when calculating the heat balance, then trace the junctions at the roof, slab and structural members. Heat can travel around the insulation at those junctions even if the wall itself is well insulated.

For a simple steady-state estimate, heat flow through an element depends on its U-value, area and the temperature difference across it. Adding EPS normally increases thermal resistance and reduces this component of heat loss. Its annual contribution depends on how often that temperature difference exists and how large it is.

Board thickness alone cannot predict the saving on heating bills. Doors, windows, ventilation and heating efficiency also affect consumption. During a short shift, warming cold surfaces and equipment may account for a substantial share of the energy used. Compare insulation options against the actual working week.

The EPS itself is lightweight. A concrete slab, masonry walls and heavy equipment can absorb considerable heat as the building warms. The position of the insulation determines which parts of the structure lie inside the heated envelope. The board’s thermal conductivity gives no measure of that stored heat.

External insulation can slow the cooling of the structure during a short break. During longer shutdowns the indoor temperature can still approach ambient conditions. Internal insulation changes the temperature and moisture profile of the wall. Assess that detail separately before relying on it to shorten start-up time.

People, wet vehicles or processes that release water vapour can quickly raise indoor humidity at start-up. The air warms faster than cold surfaces. If a surface remains below the dew point, moisture can condense there. EPS can improve surface temperatures, while the moisture sources still need to be managed.

Coordinate ventilation with temperature control and inspect corners, thermal bridges and surfaces hidden by stored goods. Investigate damp floors and roof leaks before increasing insulation thickness. Condensation, rain ingress and ground moisture call for different repairs.

Under a floor, heavy plant can continue loading the EPS throughout a shutdown. Check long-term deformation and the slab design. The roof still has to withstand wind and snow and meet the covering requirements. At foundations, check ground contact and moisture exposure regardless of the heating timetable.

For a masonry façade, select boards within the specified external thermal insulation composite system. Check declared thermal conductivity, tensile strength perpendicular to the faces (TR) and other system requirements. The corrected U-value (Uc) describes the complete building element. Fewer heating hours do not change the material properties required by the system.

Compare the installed insulation cost, the cost of altering junctions and the expected energy use for each option. Consider whether a weekend workshop may later operate every day. Where the other design requirements permit, preparing the envelope for that change can avoid reopening completed details.

EPS manufacturers include Termo Organika, Arsanit, Genderka and Neotherm. Compare declared board properties and calculations for the building in question. The operating result depends on insulation, airtightness, ventilation and heating controls working together during occupied hours and during breaks.