Patent ID: 7908808

Claim:
A roof, ceiling or wall element ( 1 ) made of several successive superposed layers of wooden boards ( 2 ; 2 a , 2 b ), where the wooden boards ( 2 ; 2 a , 2 b ) of the superposed layers lie on top of each other with their broad surfaces facing ( 3 ), and the wooden boards ( 2 ; 2 a , 2 b ) of a layer are connected to the wooden boards ( 2 ; 2 a , 2 b ) of at least an abutting layer by holding elements ( 4 ), wherein the wooden boards ( 2 ; 2 a , 2 b ) on mutually facing broad surfaces ( 3 ) are unplaned, and at least small surfaces ( 8 ) forming a visible side of the roof, ceiling or wall element ( 1 ), of the wooden boards ( 2 ; 2 a , 2 b ), are stepped at their edges with an upper and lower notch ( 9 , 10 ) and wherein the upper and lower notches ( 9 , 10 ) of the wooden boards ( 2 , 2 a , 2 b ) of two successive superposed layers form a groove ( 11 ) that is directed inward, by means of which contacting edges ( 12 ) of the wooden boards ( 2 , 2 a , 2 b ) are shifted inward and wherein the inward shifting of the contacting edges ( 12 ) conceals from the visible side gaps and other imperfections resulting from the unplaned mutually facing broad surfaces ( 3 ) of the wooden boards ( 2 , 2 a , 2 b ).