All materials used are certified.
Regarding HPL. There's more on the gills. Most likely it will be the third HPL, as they should differ from the general wood pattern of the walls. This will also be a tree, just a monotonous tonality (the tone colour of the dark veins of the wood pattern of the walls). The second HPL is dark inserts above the windows and doors of the first floors, as well as the ends of the gills, it should echo the colour tone of the window and door profiles. These two tones of volume will not be enough, and here the question is: order and select samples now (which is difficult because the main HPL walls have not been selected), or already when the main colour of the walls is chosen, choose here in fact from what is on the market.
By the amount of HPL. The volume is calculated ONLY for wooden wall panels, excluding trimming and excluding gills, excluding dark inserts above the windows (read above). For a one-story house: 61m2, and for a two-story house 115m2.