ED-BSP | Construction Physics

Sound insulation

From the acoustic point of view, lightweight and at the same time rigid elements result from the crosswise glued layer build-up. The sound insulation of these single-shell structural parts is based on their mass and bending resistance. In order to achieve good sound-absorbing insulation values for thin ED BSP | cross laminated timber wall constructions as well, double- or multiple-shell structures are primarily used. In this case, insulation panels that can serve simultaneously as installation level are especially used. To achieve the required footstep sound insulation according to DIN 4109, constructional measures minimise the direct structure-borne sound through the solid structural part by decoupling the entering noise on the upper side of the ceiling from the emitting surface on the lower side.

By combining upper-sided screeds and footstep sound insulation mats with under-sided ceiling panelling as well, very good footstep insulation is achieved for ED BSP | cross laminated timber elements. To minimise noise bridges in the connection area, elastic bearings and special fasteners are used for the ceiling elements to improve sound insulation between the used elements even further

Sound insulation example:

Wall structure:



surface dimension

Plasterboard acc. to DIN 18180
ED BSP | Cross laminated timber
Wood fibre insulating material, DIN 68755 (040)
Heat insulation plaster, acc. to DIN 18550-3 - 060
15 mm
115 mm
160 mm
20 mm
800 kg/m³
470 kg/m³
150 kg/m³
200 kg/m³
12 kg/m²
54 kg/m²
24 kg/m²
4 kg/m²
  Calculation R‘w 40,25 (dB)  

Fire protection

In case of fire, wood has the property of forming a protective carbon layer to reduce the entry of oxygen and heat, thereby significantly delaying combustion. The fire behaviour of wood can be calculated. According to the general building inspection approval, ED BSP| cross laminated timber components are classified as building material B2 acc. to DIN 4102-1 or fire behaviour class D-s2,d0 acc. to EN 13501-1. By means of the corresponding surface coatings or waterproofing of the outer layers, it is possible to achieve flame-resistant structural parts where necessary. If demands are made to the fire resistance of coated or uncoated ED BSP| cross laminated timber elements, proof of the necessary structural part properties takes place through the building inspection approval. This is done with the mathematical proof following DIN 4102-22 or DIN EN 1995-1-2 taking the combustion rate into account.

ED BSP | cross laminated timber elements generally achieve fire resistance class F30-B without special measures or coatings. Higher fire reistance classes (F60, F90) can be achieved by enlarging the thicknesses of the structural parts or using a corresponding coating that is effective in case of fire. The cross section remaining after 30, 60 or 90 min. bears the load. The solid ED BSP | cross laminated timber panels have the fire-suppresssing property of wood starting at a certain thickness. Although the smooth surface of the massive walls starts burning, it forms a thick carbon layer that quickly extinguishes the fire.

Thermal insulation

Nowadays, higher energy costs and statutory energy savings provisions (ENEV) demand construction materials with very good thermal insulation. With its low thermal conductivity (λ=0.13 W/mK) and high specific thermal capacity (c~2.10 kJ/kgK), ED BSP | cross laminated timber ideally meets these requirements.

The heat transfer coefficient (U value) provides information about the thermal insulation of the overall wall structure when there are different temperatures on both sides of the wall.

Example: Wall structure example from the inside to the outside:

Plasterboard 12,5 mm
ED BSP 115 wall element 115 mm
Wood fibre insulation material 160 mm
Heat insulation plaster 20 mm
---------------------------------------- -------------
Total wall strength 307,5 mm
 U value= 0,18 W/m²K

The high thermal capacity of ED BSP | cross laminated timber also ensures good summer heat protection. The solid ED BSP | cross laminated timber wall and roof elements heat up only slowly and can store a lot of heat so the temperaure increase becomes noticeable in the interior only after 10 to 14 hours (phase shift).

ED BSP | cross laminated timber can be combined with the most varied insulating materials (wooden, mineral, or glass fibre insulating materials, cellulose, hemp, thermal insulation composite system) to achieve insulation values all the way to the passive-house standard. Additionally arranged room-side installation levels lead to a further improvement of the insulation standard. Here, attention must be paid to execution without thermal bridges and airtight connections.

Moisture Protection

ED BSP | cross laminated timber is a vapour-permeable construction material with vapour barrier properties. Depending on moisture content, its water vapour diffusion resistance coefficient μ lies between 20 and 50. When vapour-permeable external insulation and a façade are executed, vapour-blocking or vapour-dampening films are unnecessary.

The property of ED BSP | cross laminated timber to absorb indoor moisture without damage (sorption property) promotes a comfortable and balanced indoor climate.


Solid ED BSP | cross laminated timber penels are airtight starting with the 5-layer structure.

The structural part connections (butt joints, window, door and base connections as well as penetrations, etc.) must be professionally sealed with the suitable adhesive tapes to create flow-tight building shells that minimise heat loss and optimise sound insulation.

Wood protection

ED BSP | cross laminated timber elements may only be used in utilisation classes 1 and 2. Thus, the application areas are fully closed and heated structures or roofed open structures, for example.

ED BSP | cross laminated timber is technically dried so under the conditions set by utilisation classes 1 and 2 acc. to DIN 68800-1, there is no danger from fungi and insects with u<20% wood moisture.

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