The passive house is an energy-efficient building with year round comfort and good indoor environmental comfort without the use of significant active space heating or cooling.

A passive house is a building in which a comfortable interior climate can be maintained without active heating and cooling systems. The passive house is the ultimate in low energy building and is recognised worldwide as the most advanced in terms of energy performance of buildings. The passive house offers one of the most desirable technological and economical solutions for comfortable living and working.

The passive house standard, developed by the Passivehaus Institut in Germany ( is a specific construction standard for buildings. To-date approx. 20,000 houses in Europe have been built to the passive standard. The passive standard includes excellent insulation levels with minimal thermal bridging, very low air-leakage through the building, utilisation of passive solar gain, mechanical ventilation with efficient heat recovery. The primary focus in building to the Passivhaus Standard is directed towards creating a thermally efficient envelope which makes use of free heat gains in order to minimise space heating requirement.

The energy requirement of a house built to
Passivhaus Standard is;

- Annual space heating requirement of less than 15kWh/(m2a)
- Total primary energy demand for space and water heating, ventilation, household appliances and lighting not to exceed 120 kWh/(m2a)
- Air leakage not to exceed 0.6 air changes per hour

A passive house is cost-effective when combined with capitalised costs (construction, including design and installed equipment, plus operating costs for 30 years) do not exceed those of an average new home.

The Thermohouse Solution
The thermohouse system is a flexible system of construction which enables the occupier not only to benefit from the low energy requirement but also to enjoy the superior indoor air quality and living environment. By 2020 all new buildings in Europe shall be constructed to this standard (EU agreement 17th November 2009). The thermohouse system enables the construction of a thermally efficient envelope today, and in a cost competitive manner.
See list of elements

1. The thermohouse external wall system provides a strong, durable, airtight wall with excellent insulation properties. There are two widths available for external wall elements 400mm and 450mm with a U value of 0.13 and 0.11 respectfully.

2. The thermohouse roof panel is a highly insulated panel with unique structural strength. Easy to install this roof panel will make a house weatherproof in a short time. The u-value of the roof is 0.15.

3. The thermohouse underfloor heating board operate more efficiently when used with the thermohouse system. This board has a u-value of 0.45 to 0.12.

The thermohouse thermal envelope is compared to the Passivhaus Standard in the following chart:

Insulation System Passivhaus Standard Thermohouse
Walls U = 0.15 U = 0.13-0.11
Roof U = 0.15 U = 0.15
Underfloor Board U = 0.15 U = 0.12
Thermal Bridges w= 0.01 W/(m2K) w= 0.01 W/(m2K)

In addition, window frames, doors and window glazing must have a U-value = 0.8 W/m2K and an air tightness of n50 = 0.6 air changes per hour.

Though not part of the thermohouse thermal envelope the thermohouse system also includes the thermohouse floor panel and thermohouse internal wall system. These facilitate the completion of the project in a fast efficient manner.

People are becoming increasingly aware of the advantages of building a passive house house. Now these houses can be built at competitive prices using the thermohouse system and are fully certified for a minimum life span of 60 years.

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