Quality Assurance Association
CO2-neutral Wooden Buildings e.V.
Solid wood house “DMBV-Active-House” - Climate Protection Credit
For every cubic meter of built-up wood, 0.9 tons of CO2 is converted into oxygen and biomass. Solid wood houses score especially well on this account. The trade association uses this fact for a new certificate known as the “DMBV-Active-House”.
The contractor received a certificate after the move into this solid wood house. It says: “This single-family residential dwelling has been designed using the highest ecological standards and actively contributes to sustainable construction and climate protection. CO2 that has been stored during the growth phase of the wood used is sufficient to compensate for the CO2 emission of this building for heating purposes over a period of about 62 years. The building is therefore qualified to use the designation DMBV-Active-House”.
Building and Heating with Wood
The underlying calculation is really simple: if a total of 54 cubic meters of wood are used to build a house, this would amount to 48.6 tons of carbon dioxide being stored. Pinewood was primarily used. The house was built as a classic log blockhouse; the triple-laminated Nordic pine logs form a single-layer exterior wall without any additional insulation. The solid exterior walls are 20 centimeters thick. Interim results: The log blockhouse contractors were able to record a credit to their climate protection account of nearly 50 tons of constructional wood.
The house's heating system is renewably and ecologically exemplary because the central heating unit uses wood pellets. It emits only as much CO2 into the environment as was previously bound up in the growth of the wood used for the pellets. Only the amount of CO2 locally released during the combustion of the wood pellets underlies the calculation of the German Solid Wood and Log Blockhouse Association (in German: Deutscher Massivholz- und Blockhausverband (DMBV)). All types of heating can be used in the calculation. The calculated heating demand for the sample house leads to an annual output of exactly 0.877 tons of CO2. Result: residents can heat for about 62 years until their 'climate-credit' of 48.6 tons is exhausted.
The Active-House Certificate is awarded by the Log Blockhouse Construction Quality Assurance Association (in German: Gütegemeinschaft Blockhausbau); the values are determined individually for each house by a professional technical engineer according to officially recognized data bases.
With the “DMBV-Active-House” Certificate, the Association does not only want to present the residents with a clear comparison method. The solid wood and log blockhouse builders also want to draw attention to one of the prevailing grievances, in their opinion. DMBV Managing Director Michael Kuempfbeck criticizes: “Evidence referred to in the EnEV or KfW inadequately presents the actual climate change impact of new dwellings. In this account, only the effects on the climate change while a building is being used have been recorded”. The amount of climate credits calculated by DMBV could only be achieved using wood as the building material - and most clearly here with solid wood.
House Fact Sheet
Log blockhouse with “DMBV-Active-House” certification
|Living area / floor space||Ground floor: 87.05 m²
Top floor: 70.77 m²
Total: 153.09 m³
|External dimensions||11.0 m × 10.0 m|
|Construction method||Singe-layer, solid triple-laminated logs, Nordic pine
Settlement-free wall structure based on prefabricated construction, 20 cm wall thickness
|Roof||38° pitched gable roof with rafter panel insulation, 1.095 m knee wall|
|Heating||Wooden pellets, central heating|
This classic log blockhouse with exterior walls of a single-layer of logs receives the Climate Certificate of the Association.
Comfort and comfortable climate – and not a rustic ambience at all inside the house.