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How to join the cement-bonded particleboards on the facade?

Combined facade of cement-bonded particleboard + tiles on it.

In the summer I will do a ventilated facade, 20cm stone wool in the spacing of the wooden frame. Gap, cement-bonded particle board on the vertical bars, on top of it partly tile, partly paint.

The most pressing issue – the seams, divided and agreed with my wife, the facade so that the joints and the end of the plates were everywhere hidden a couple of centimeters under the tiles.

However, there are 4 places on the entire facade where the plate connects at the joint. How to do that would not crack the joint, but without doing cover?

• joints
• exterior