During foundation laying, reinforcing rods can inserted vertically and spaced at regular 25 cm intervals (to coincide with spaces in the blocks) to a height of about 50 cm (40Ø). The other possibility is to vertical insert these reinforcing rods, once the foundation has been realized, with the first layer of cement-bonded wood fibre blocks laid (as indicated by the designer of the structure).
The first layer of blocks can be laid on two layers of mortar along the block walls in order to level them correctly (use of a spirit level recommended). Layering mortar over the entire width of the block is to be avoided because the mortar has a compressive strength lower than that of the concrete (Resistance to Compression = 30 N / mm2). Plumb-line to position and level the corners.
After the first layer of blocks have been well-placed starting from corners (UNI), proceed with the laying of successive dry layers, ensuring a tight vertical fit to avoid creating thermal and acoustic bridges. It is essential to stagger the next course by half a block, using the special pieces as shown in the pictures, so as to obtain within the blocks the maximum cross-section of concrete and the loading of the wall as shown in the table of the product section.
The blocks must be laid with the reinforcing rod channel upwards and the insulation towards the outside. Any blocks cut to fit the wall must be positioned to its centre throughout the layers in order to avoid phase shifts of the internal ribs of the blocks with consequent reduction of load capacity and difficulty in filling the formwork with concrete. Reinforcing rods should be laid horizontally into the channelling of each row of blocks up to a height of 6 layers, corresponding to 1.5m.
Now proceed with filling the walling with concrete by bucket or pump, taking care not to apply excessive pressure that might shift the alignment of blocks. The concrete must have a workability of S4-S5 with required resistance class derived from calculations and small aggregate grain size (12-15 mm) in order to adequately fill the blocks.
It is essential to begin filling from the perimeter walls keeping about a metre away from corners, doorways and windows so that the concrete passing through the blocks exerts less pressure, thus avoiding any shift. Having finished with perimeter walls, begin filling interior walls.
During the filling of the 6 layers it is essential to fill to the middle of the sixth layer of blocks, inserting 2 m high vertical reinforcing rods and vibrating to ensure thorough filling of the walling structure. In the event that, during casting, concrete ends up on the walls of the blocks, it should be removed immediately so that it does not harden to a thickness. Finally, proceed to the height of the flooring.
CNR 10025/84 regulations provide for the insertion of Ø 16 rods at corners and around doorways and windows. The reinforcing must always be adequately planned by the designer of the structure.