The clamps remain inside the joint

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Attach it to the lathing with nails through the groove, etc.
Fastening in horizontal position is carried out using a similar technology.

Mounting on clamps
Clamps are special stamped brackets with a hook and holes, designed for fastening finishing panels. The products are available in several standard sizes for different types of lining and finishing panels.

This type of installation is more labor-intensive and costly, but has a number of advantages:

Durability of the structure. The clamps are firmly fixed bc data america the lathing, not to the lining. The structure of the panels is not damaged, which eliminates the occurrence of cracks and other damage. The likelihood of mechanical defects is reduced and the overall service life of the sheathing is increased.
The slats on the brackets can be easily removed without damaging the material.
High aesthetics – the clamp connection ensures a tight fit of the panels to each other, while the fastening elements themselves remain invisible.

The work is carried out in the following sequence:
Place the first plank with the tenon in the corner (for vertical fastening), in the ceiling or floor (for horizontal fastening) and firmly attach it to the battens through and through with nails or screws.
Place clamps on the edge with the groove and secure the panel through the holes with self-tapping screws.
Insert the second piece with the tenon into the groove of the previous one and press it tightly along its entire length, using a tamping block and a hammer.
Place clamps on the free edge with a groove and attach to the battens. Insert the next lamella, etc.
Every 7-10 panels, check the correct installation with a level.
Useful video on choosing clamps and fastening them with screws: