BUILDING PHYSICS 29 binderholz CLT BBS Wood is permeable for diffusion and therefore permits the autonomous movement of steam through building parts. This positive building physical attribute of cross laminated timber CLT BBS and its capacity to absorb room humidity without being damaged (absorption property) contribute decisively to a comfortable and balanced room climate. Steam diffusion The full-surface adhesive joints of CLT BBS are permeable for diffusion. Attempts by the adhesive manufacturer prove that the common adhesive joint has the same diffusion resistance as a 13-mm thick spruce board. CLT BBS is accordingly permeable for diffusion while it has a steam-reducing effect. These two positive characteristics are important criteria for a comfortable living climate. The glued single- layer CLT BBS boards do not have any effect on the diffusion behaviour of the complete structure. In principle, CLT BBS structures are designed without steam retardants or steam barriers. The suitability of the complete component must be proven in the individual case. All structures contained in this brochure have been tested in terms of building physics. Rigips dry construction systems Rigips controls the room climate Gypsum panels contain a great number of pores that absorb and store the moisture in the room when the humidity is temporarily increased. If the room air is dry, it releases the moisture to its environment again. This way, the room climate is automatically regulated. Rigips panels do not contain any health-hazardous substance such as heavy metals, biocides, formaldehyde or fine dust. Therefore, the products have been recommended by the Institut für Baubiologie Rosenheim [Rosenheim Instite for Building Biology] (IBR) and the Österreichisches Institut für Baubiologie und Ökologie [Austrian Institute for Building Biology and Ecology] (IBO) as a building material. Convention Due to the full-surface gluing of the CLT BBS elements, there are no hollow spaces that permit a convection. When installing built-in parts, it must be ensured that the construction is provided airtight to prevent convection through leakages. Building physical parameters of CLT BBS Parameter Remarks Gross density 450 kg / m³ with a wood moisture of 12 % ± 2 % in the condition on delivery Heat conductivity λ 0.12 W/ mK according to ETA-06 / 0009 Specific heat capacity 1,600 J / kgK cp according to EN ISO 10456 Water steam diffusion resistance factor µ 40 to 70, dependent on the wood moisture and number of glued joints according to EN ISO 10456 Airtightness airtight from 3-layered design tested by Holzforschung Austria, expert report on request Flammability Euro class D-s2, d0 according to EN 13501-1 © GriffnerHausAG
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