Within this project the carbon sink effects of twenty existing wooden houses in serveral European countries should be analized as well as the real annual CO2 emissions for heating and domestic hot water. The construction types are
– timber frame systems
– cross laminated systems and
– log systems.
All objects were manufactured in a period between 2004 and 2014.
The carbon sink rates are to be calculated in two different ways. First the GWP-rates modules A1, A2 and A3 according to Environmental Product Declarations (EPDs) of EN 15804 were collected. In a second step the masses of wood (real consumption of solid wood, kiln-dried) and the absorbed masses of carbondioxide during the growth of trees for exterior walls and isolated roof areas get analized. The conversion factor between solid wood mass (kiln-dried) and CO2 consumption herein is 1,83 kg CO2 per 1 kg solid wood (50 % carbon in solid wood).
Including cellar/base plate, exterior and interior walls, ceilings, roofs, windows and floor constructions most of the buildings have carbon sink effects. Cellar/base plate, windows and floor construction in all cases show carbon emissions, walls, ceiling and roof sink effects.
At the end follows a comparison to a reference building in a typical mineralic construction. As a function of e.g. architecture and construction the difference between wood and mineralic construction was about 20 to more than 80 tons carbon dioxide for total manufacturing processes A1 – A3.
The essential data and results you will find here: