The project is aimed not only at ensuring that the building can be run in an energy-efficient way, but also at considering the use of energy in producing the materials, the impact on the health of those who use the building, and the legacy of deconstruction.
The central access core was built in class 3 reinforced concrete throughout, as were the walls and stair landings. The flights of stairs were assembled as precast concrete components.
Sustainability was the key idea behind the “WOODCUBE” project. This informed the decision to use chemically untreated, carbon-neutral wood as a construction material.
In addition, the upper sides of the floor and ceiling elements have dual-layered dry screed on 60 mm mineral fill and 30 mm mineral fibre insulation in order to ensure noise protection. On top of this is the floor structure itself, made of solid timber boards on battens. Another soft wood fibreboard lies between the battens.
In addition, these supports are also found at the joins with the ceiling-like joists for the outer wall structure and as supports for the solid timber window lintels around the medium-sized and large window openings. Below the lintels above the large window openings are more steel beams that act as core support.
The balcony slabs take the form of continuous ceiling elements, designed as cantilevered single-span girders.
In areas of higher loads due to the building components on top of them (in particular, underneath the cantilevered balcony slabs), solid timber supports are integrated into the outer wall structure.
This means that the floor surfaces allow for flexible layouts and uses. The joists act as composite cross-sections of the combination of solid timber beams with a vertical UPE steel profile. The ceiling elements are attached to the solid wood beams by fully threaded screws, wedged into the steel profile with wooden fillers.
The ceiling elements stretch from the exterior walls to the staircase core built in concrete, to which they are connected by a floating T-square. Ceiling-like joists for the stacked board element supports are positioned in such a way as to take account of the staircase walls and balconies in the case of an extension.
The floor and ceiling structure consists of the following elements:
• 6 cm insulating board, including battens and solid wood floor
• 2 cm dry screed elements (glued to the front end)
• Kraft paper as a dividing layer
• 2 cm dry screed elements (placed in the gaps)
• 3 cm footfall sound insulation – Isover Akustic EP1
• 6 cm Fermacell honeycomb paper infill
• Kraft paper as trickle protection
• 23.5 cm Holz100 ceiling
Floor and Ceiling Elements and Access
The roof structure and the floor and ceiling elements also consist of unglued cross-laminated board elements, to the top and underside of which boards are applied at right angles. These 2.5 cm thick board layers are fastened to the board stack elements with beech wood dowels.
Holz100 Canada Inc.