45 degrees,.

Since there is a massive board, remember the two main factors of its safety.

First, do not try to carry out parquet work yourself. The fact is that in this process there are many nuances that only professionals know about. Did you know that if there is a threat of drying out into the room. then you need to apply a chamfer, that is, mowed at an angle of 45 degrees,. In this case, the gaps between the boards are formed, but this should not be scared. since the moisture differences in this case will not force the boards to «play» and deform.