A wall system for a furnace, which comprises the following features: 1.1 a wall, which has 1.1.1 an inner side facing the furnace chamber and 1.1.2 an outer side facing the environment; 1.2 a heat-conducting layer, which 1.2.1 is arranged on the inner side of the wall; 1.3 bearing surfaces, which 1.3.1 are embodied on the inner side of the wall; 1.4 refractory bricks, which 1.4.1 in each case have an opening, which goes through the brick, 1.4.2 are arranged next to one another in at least one row (30.1-30.6), 1.4.3 in each case have a side, which faces the inner side of the wall and which can be mounted holohedrally to heat-conducting layer, wherein 1.4.4 the openings of the bricks, which are in each case arranged next to one another in a row (30.1-30.6), are aligned with one another; 1.5 rods (40.1-40.6), which 1.5.1 are in each case guided through the aligned openings of the bricks, which are arranged next to one another in a row (30.1-30.6), and 1.5.2 which in each case bear on a number of the bearing surfaces; 1.6 wherein the bricks, which are in each case arranged next to one another in a row (30.1-30.6), 1.6.1 can be moved from a first position, in which a clearance is embodied between the bricks and the heat-conducting layer, 1.6.2 into a second position, in which the bricks are mounted holohedrally to the heat-conducting layer with their side, which faces the inner side of the wall, by means of the force of gravity. 1.1 a wall, which has 1.1.1 an inner side facing the furnace chamber and 1.1.2 an outer side facing the environment; 1.1.1 an inner side facing the furnace chamber and 1.1.2 an outer side facing the environment; 1.2 a heat-conducting layer, which 1.2.1 is arranged on the inner side of the wall; 1.2.1 is arranged on the inner side of the wall; 1.3 bearing surfaces, which 1.3.1 are embodied on the inner side of the wall; 1.3.1 are embodied on the inner side of the wall; 1.4 refractory bricks, which 1.4.1 in each case have an opening, which goes through the brick, 1.4.2 are arranged next to one another in at least one row (30.1-30.6), 1.4.3 in each case have a side, which faces the inner side of the wall and which can be mounted holohedrally to heat-conducting layer, wherein 1.4.4 the openings of the bricks, which are in each case arranged next to one another in a row (30.1-30.6), are aligned with one another; 1.4.1 in each case have an opening, which goes through the brick, 1.4.2 are arranged next to one another in at least one row (30.1-30.6), 1.4.3 in each case have a side, which faces the inner side of the wall and which can be mounted holohedrally to heat-conducting layer, wherein 1.4.4 the openings of the bricks, which are in each case arranged next to one another in a row (30.1-30.6), are aligned with one another; 1.5 rods (40.1-40.6), which 1.5.1 are in each case guided through the aligned openings of the bricks, which are arranged next to one another in a row (30.1-30.6), and 1.5.2 which in each case bear on a number of the bearing surfaces; 1.5.1 are in each case guided through the aligned openings of the bricks, which are arranged next to one another in a row (30.1-30.6), and 1.5.2 which in each case bear on a number of the bearing surfaces; 1.6 wherein the bricks, which are in each case arranged next to one another in a row (30.1-30.6), 1.6.1 can be moved from a first position, in which a clearance is embodied between the bricks and the heat-conducting layer, 1.6.2 into a second position, in which the bricks are mounted holohedrally to the heat-conducting layer with their side, which faces the inner side of the wall, by means of the force of gravity. 1.6.1 can be moved from a first position, in which a clearance is embodied between the bricks and the heat-conducting layer, 1.6.2 into a second position, in which the bricks are mounted holohedrally to the heat-conducting layer with their side, which faces the inner side of the wall, by means of the force of gravity.