referring now to the figures of the drawing in detail and first , particularly , to fig1 thereof , there is seen a front perspective view of a housing of a heating home appliance in the form of a block - shaped baking oven box 1 , which has four oven walls 2 , 3 , 4 and 5 disposed at right angles to one another , and an oven flange or oven loading flange 6 at the front being bent at angles and extending all the way around a front opening of the oven box . an air distribution shaft 8 is disposed in front of a rear oven wall 7 and has a corresponding blower 9 and air heater 10 . in this way , heated streams of air can be blown in the direction of arrows into an appliance space in the interior of the oven box 1 . a radiant heating body 11 is located on the inside of the upper oven wall 3 , while a heating body 12 is located on the outside , below the lower oven wall 5 , and acts as a so - called bottom heater . in the exemplary embodiment of fig2 reference numeral 1 again designates an oven box , but it is somewhat altered in cross section and the loading flange 6 of fig1 is not shown . in this example , the oven walls 2 , 3 , 4 and 5 are surrounded in a dimensionally adapted fashion by four foil layers 13 , having a structure which will be described in further detail below . each foil layer 13 has flexible edges 14 on the periphery , that are formed of the foils themselves and act as fastening and / or connecting elements , which protrude beyond the outer dimensions of the oven box 1 . once the respective foil layer 13 has been applied and dimensionally adapted to the outside of the oven box 1 , the flexible edges 14 are folded over in the direction of an arrow onto the adjacent foil layer . due to the mutual overlapping of the foil layers 13 , a gap - free thermal insulation of the applicable oven walls is obtained . in the exemplary embodiment of fig3 only two longer foil layers 13a are provided in order to insulate the oven walls of the oven box 1 . the longer foil layers 13a form a butt joint with one another in a middle region of the lateral oven walls 2 and 4 , and their edges 14 are bent outward and folded back in the direction of an arrow onto the respective foil layer 13a , or else they protrude and are folded together outward , as is indicated in dashed lines . in the exemplary embodiment of fig4 a front view of an oven box 1 is again shown diagrammatically , with the loading flange 6 broken away . a one - piece foil layer strip 15 is used to insulate the aforementioned oven walls . the foil layer strip 15 has four foil layers 13b being separated from one another by compressed peripheral segments 16 and it also has edges 14 that protrude into the open on both ends . this foil layer strip 15 is wound around the aforementioned oven walls , and the compressed peripheral segments 16 act as bent connecting elements in the corner regions of the oven box 1 . fig5 shows a part of a foil layer 13 on a larger scale with an associated edge 14 or peripheral section 16 , in an embodiment of a foil layer strip . this foil layer 13 is multi - ply or multilayered and includes , for instance , four aluminum foils a , b , c and d . the foils a and d are outer cover foils . the foils b and c are inner foils in the exemplary embodiment , they have a random embossed pattern , for example , and they are disposed crosswise to one another . in other words , randomly patterned and elongated embossed locations 17 are perpendicular to one another and touch at isolated points . these embossed locations 17 act as spacer elements , which keep the multi - ply or multilayered foils a , b , c and d of this example spaced apart from one another by a predetermined amount . in the region of their edges , the foils are placed directly one on the other and are sealed at least approximately air - tightly by compression . this compression can be performed by repeated partial deep drawing of the foil composite in the region of deep drawing locations 18 as is shown in fig6 and 7 , although not all of the foils are shown . subsequent crimping of the deep drawing locations 18 produces a flat edge 14 , having foil edges which are interlocked undetachably with one another , as fig7 shows . the deep drawn and crimped points may have an approximately z - shaped profile overlapping one another , as is shown in the plan view of fig8 . fig9 shows the oven box 1 in a horizontal section in somewhat more detail . this box has the loading flange 6 on the front . it can be seen that the outer surfaces of the lateral oven walls 2 and 4 have foil layers 13c , which may , for example , be part of a one - piece foil layer strip . the foil layer 13c which is used in this case is shown in further detail in fig1 and 11 and it includes two outer cover foils a &# 39 ; and d &# 39 ; and two inner foils b &# 39 ; and c &# 39 ;. the inner foils b &# 39 ; and c &# 39 ; are provided with cup - shaped or depression - shaped spacer elements 19a and 19b which are constructed in a regular pattern as embossed locations and support one another mutually . these multi - ply or multilayered profiled foils b &# 39 ; and c &# 39 ; are disposed and associated with one another in such a way , or laid on one another in such a way , that the spacer elements 19a of the foil c &# 39 ;, for instance , meet the spacer elements 19b of the foil b &# 39 ; in such a way that they support one another . these foils are constructed identically . the spacer elements 19a have preferably circular indentations 20 at supporting surfaces , in which the contrasting spacer elements 19b dip with their flat supporting surfaces and are retained in form - locking fashion . a form - locking connection is one which connects two elements together due to the shape of the elements themselves , as opposed to a force - locking connection , which locks the elements together by force external to the elements . in this way a solid fixation of the foil composite is attained , so that even if the foil layer 13c bends , the predetermined honeycomb - like pattern is preserved . a further factor is that the cover foils a &# 39 ; and d &# 39 ; are similarly provided with profiling and specifically with protuberances 21 on one , and indentations 22 , in the other . the flat surrounding surfaces of the spacer elements 19b engage the protuberances 21 and are fixed there . in the exemplary embodiment of fig1 , the honeycomb - like foil layer pattern is further extended by two additional foils e &# 39 ; and f &# 39 ;, having a structure and configuration that is analogous to the foil layer 13c shown in fig1 . through the use of the cup or bowl - shaped spacer elements 19a and 19b , a number of air chambers 23 are formed between the cover foils a &# 39 ; and d &# 39 ;. these chambers 23 are sealed at the periphery in the above - described manner , for instance by the edges 14 or peripheral sections 16 . in the exemplary embodiment of fig9 and 10 , the edge 14 that defines the foil layer 13c on one side is bent at an angle of 180 ° and is thermally closely and directly coupled to an inner surface 24 of the loading flange 6 , or secured to it over a relatively large area . in particular , whenever the cover foil , such as the cover foil a &# 39 ; directly contacting the oven box 1 , is formed of a high - heat - resistant material such as sheet steel of a somewhat larger cross section , the result attained in this way is an intensive outflow of the heat produced in the region of the loading flange 6 , when the oven is operated at operating temperatures of approximately 500 ° c ., particularly in the pyrolytic self - cleaning mode , and thus a lowering of the flange temperature is attained . moreover , a certain control of the heat distribution and a direct coupling of the inner cover foil a &# 39 ; to the oven box 1 over a small surface area , for instance a coupling to the oven wall 4 , is attained because only the protuberances 21 of the foil layer 13c or of the cover foil a &# 39 ; are in direct contact with the box wall 4 , while air chambers are formed between these protuberances 21 in the region of the indentations 22 . as is shown in fig9 provision may be made so that in the lateral oven wall 2 or 4 , for instance , there is a recess with a cutout 26 , for instance for receiving an oven lighting device . in a similar way to the situation with the loading flange 6 , the edge 14 of the foil layer 13c can be bent in this case as well and secured directly to the outer wall of the cutout 26 for purposes of heat dissipation . the foil layer 13c is therefore provided with a circular or elongated recess 27 , for instance , which is bounded by the encompassing edge 14 . fig1 shows essentially the same structure as fig1 or fig1 . in this case , between the contacting or supporting points , or in other words the indentations 20 of the profiled foil e &# 39 ; and the flat supporting surfaces of the adjacent , upper foil b &# 39 ;, there are intermediate layers 30 of a material that is a poor conductor of heat . as a result , the aforementioned two foils are largely thermally decoupled from one another . it is understood that if the foils or intermediate foils have a corrugated shape , for instance as in fig5 such intermediate layers may be provided , which in that case then are elongated and strip - like , while in fig1 they are constructed in the form of round disks . in the exemplary embodiment of fig1 , a substantially corrugated or randomly shaped foil b is disposed as a spacer element between two cover foils a and c . the foil b is continuously provided with mutually overlapping , elongated holes or free cuts 31 , which reduces the mass of this intermediate foil b by approximately 90 %. in this simple way , thermal conduction between the cover foils a and c is maximally avoided , and a reduction in weight of the foil layer is also attained . it is possible within the scope of the invention to vary the number of foils within one foil layer in order to suit the thermal load that originates entirely or in part in the heating home appliance to be insulated . it is also possible to use other materials , such as heat - resistant plastics , instead of aluminum . the use of high - heat - resistant material , such as steel , special steel or the like , for at least the inner cover foil is practical whenever the corresponding foil layer directly covers a heating body , for instance the underheater 12 located on the outside as shown in fig1 . the edges or peripheral regions of the foil layers may also be sealed or compressed in air - tight fashion , for instance by welding .