Energy efficiency

Thermal properties of a log house are often questioned. The opinion of a log house being cold in winter, thus incurring high heating expenses, is rather common.

However, thermal properties of a house are determined by the full package – walls, roof, flooring, windows and doors. Walls contribute, in average, 25% of thermal loss of total heat loss of a house. Therefore, the insulation of roofs and floors and the quality of windows and doors plays a very important role in thermal properties of a house. Thermal properties of a massive glued log wall meets the building standards of today, provided that additional insulation is adhered to the other parts of the building concerned.

Thermal loss and compensation calculations are conducted for that purpose, indicating how all the other parts of a building are to be insulated to achieve standard thermal properties or heat conductivity coefficient K with the value of 0.25 W/m2K.
Finnlamelli uses glued logs with the dimensions of 180x260mm, 202x260mm and 240x260mm to build log houses, intended to be inhabited all the year round. Special gaskets will be attached between logs in course of buildings as a wind barrier while mineral wool strips are used for thermal insulation of cross-joint corners.

Bulk wool layer with the minimum thickness of 350 mm is used as thermal insulation of roofs. Solid wood windows with double of triple glazing package are used as fittings. The chamber between glazings is filled with argon gas, being an excellent thermal insulation material, in windows, used by Finlamelli.

Where such methods are used, massive glued log walls do not require additional wool or wind barrier sheets as thermal insulation, while also providing for natural moisture regulation. This is one of the main properties and advantages of a log.