apartment building

Abstract

To provide a housing complex capable of improving comfort of an indoor shaped part.SOLUTION: Provided is a housing complex 1. The housing complex 1 comprises: a plurality of dwelling units 2; an indoor shared part 3 as a shared space facing the plurality of dwelling units 2 and sectioned from outside air; and an air-conditioner 4 for supplying conditioned air to the indoor shared part 3. Each of the plurality of dwelling units 2 has a floor heat insulation structure 21. The indoor shared part 3 includes a shared foundation 23 surrounding the indoor shared part 3. The shared foundation 23 is provided with a heat insulation material 25 for heat-insulating at least a part of the shared foundation 23.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to apartment buildings. [Background technology]

[0002] BACKGROUND ART Various types of apartment buildings including multiple dwelling units have been proposed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-217921 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, in apartment buildings, it has been considered to design common areas such as corridors and stairwells facing each dwelling unit as indoor common areas, separating them from the outside air. While such indoor common areas are excellent from the perspective of crime prevention, they tend to trap heat and cold from outside, and there is room for improvement in terms of comfort.

[0005] The present invention has been devised in view of the above-mentioned circumstances, and its main object is to provide an apartment building that can improve the comfort of indoor common areas. [Means for solving the problem]

[0006] The present invention is an apartment building comprising a plurality of dwelling units, an indoor common area which is a shared space facing the plurality of dwelling units and separated from the outside air, and an air conditioner for supplying conditioned air to the indoor common area, wherein each of the plurality of dwelling units has a floor insulation structure, the indoor common area includes a common area foundation which surrounds the indoor common area, and the common area foundation is provided with insulation material for insulating at least a portion of the common area foundation. [Effects of the Invention]

[0007] By adopting the above-described configuration, the apartment building of the present invention can improve the comfort of indoor common areas. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a conceptual diagram showing an apartment building according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of the base of FIG. 1. [Figure 3] FIG. [Figure 4] FIG. 10 is an enlarged view of a foundation of an apartment building according to another embodiment of the present invention. [Figure 5] 10 is a graph showing the relationship between the difference in heat loss amount in the indoor common area and the ratio of the perimeter length of the first portion to the perimeter length of the second portion. [Figure 6] 10(a) and 10(b) are plan views showing the foundation of an apartment building in which the ratio of the perimeter of the first portion to the perimeter length of the second portion is different from each other. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be understood that the drawings include exaggerated representations and representations that differ from the dimensional ratios of actual structures in order to facilitate understanding of the contents of the invention. Furthermore, identical or common elements are designated by the same reference numerals throughout the embodiments, and redundant explanations will be omitted. Furthermore, the specific configurations shown in the embodiments and drawings are for the purpose of understanding the contents of the present invention, and the present invention is not limited to the specific configurations shown in the drawings.

[0010] [Apartment building (first embodiment)] 1 is a conceptual diagram showing an apartment building 1 of this embodiment. The apartment building 1 is configured as, for example, an apartment or condominium. In this embodiment, a two-story apartment building 1 is illustrated as an example, but it may also be, for example, a one-story apartment building or a three-story or higher apartment building.

[0011] The apartment building 1 is made up of a plurality of dwelling units 2, an indoor common area 3, and an air conditioner 4. The plurality of dwelling units 2 and the indoor common area 3 are made up of a foundation 5, exterior walls 6, interior walls 7, floors 8, ceilings 9, a roof 10, etc., similar to conventional apartment buildings 1, for example.

[0012] [Dwelling unit] Each dwelling unit 2 is an individual unit in the apartment building 1 and is a private area for the resident. Each dwelling unit 2 has the necessary functions as a residence, and is configured to include, for example, a living room 16, a toilet 17, and a bathroom (not shown).

[0013] In this embodiment, the multiple dwelling units 2 include a first-floor dwelling unit 2A and a second-floor dwelling unit 2B. Each of the first-floor dwelling unit 2A and the second-floor dwelling unit 2B may include only one unit, or multiple units. If each of the first-floor dwelling unit 2A and the second-floor dwelling unit 2B includes multiple units, the dwelling units 2 are separated by a parting wall (not shown).

[0014] [Indoor common area] The indoor common area 3 is a common space that faces multiple dwelling units 2 and is separated from the outside air. Such an indoor common area 3 is separated from the outdoors (outside the apartment building 1) 19 by an exterior wall 6, improving crime prevention. In this embodiment, the indoor common area 3 is configured as a corridor, stairwell, etc. facing each dwelling unit 2.

[0015] In this embodiment, the indoor common area 3 includes a first-floor indoor common area 3A and a second-floor indoor common area 3B. These first-floor indoor common area 3A and second-floor indoor common area 3B are, for example, corridors. The first-floor indoor common area 3A faces the first-floor dwelling unit 2A. Meanwhile, the second-floor indoor common area 3B faces the second-floor dwelling unit 2B.

[0016] The indoor common area 3 of this embodiment includes a staircase 3C having stairs that can be used to ascend and descend between the indoor common area 3A on the first floor and the indoor common area 3B on the second floor. Air can flow between the indoor common area 3A on the first floor and the indoor common area 3B on the second floor via this staircase 3C.

[0017] [Air conditioner] The air conditioner 4 is for supplying conditioned air (hereinafter sometimes referred to as "conditioned air") A1 to the indoor common area 3. The air conditioner 4 of this embodiment includes, as a set, an indoor unit 4A and an outdoor unit (not shown) installed outside the apartment building 1 (outdoors 19).

[0018] The indoor unit 4A of this embodiment is installed in the attic 14 of the apartment building 1, and an outlet grill 4a and an intake grill (not shown) are provided on the ceiling 9B on the second floor. This indoor unit 4A supplies conditioned air A1 to the indoor common area 3B on the second floor, and further to the indoor common area 3A on the first floor via the staircase 3C. This conditions the entire indoor common area 3. This can improve comfort in the indoor common area 3, where heat and cold air from outside tend to build up.

[0019] The indoor unit 4A of the present embodiment supplies conditioned air A1 to the indoor common area 3B on the second floor, but is not limited to this. For example, the conditioned air A1 may be supplied to the indoor common area 3 on the first floor, or to both the indoor common area 3 on the first floor and the indoor common area 3 on the second floor.

[0020] [Basic] Fig. 2 is an enlarged view of the foundation 5 of Fig. 1. The foundation 5 is made of, for example, reinforced concrete. The foundation 5 includes a base portion 5a that extends horizontally underground and a rising portion 5b that extends upward from the center of the width of the base portion 5a and protrudes from the ground G. In the area defined by the foundation 5, for example, a dirt floor (concrete floor) 11 is provided.

[0021] [Exterior and interior walls] As shown in FIG. 1 , the exterior walls 6 are used to separate the interior space of the apartment building 1 (including, in this example, the multiple dwelling units 2 and the indoor common area 3) from the outdoors 19. On the other hand, the interior walls 7 are used to separate the multiple dwelling units 2 from the indoor common area 3. These exterior walls 6 and interior walls 7 are arranged, for example, on a foundation 5. Furthermore, the exterior walls 6 and interior walls 7 may be provided with heat insulating material (not shown) as in conventional cases.

[0022] [floor] The floor 8 of this embodiment is configured to include a first floor 8A and a second floor 8B.

[0023] The first floor floor 8A constitutes the floor of the first floor dwelling unit 2A and is disposed, for example, on the foundation 5. As a result, the apartment building 1 of this embodiment has an underfloor space 12 partitioned by the first floor floor 8A, the foundation 5, and the earthen floor 11.

[0024] In this embodiment, the first floor floor 8A is made of flooring with a plurality of plank panels arranged side by side, while the floor of the indoor common area 3A on the first floor is made of earthen floor 11A (earthen floor 11).

[0025] The second floor floor 8B constitutes the floor of the second floor dwelling unit 2B and the floor of the second floor indoor common area 3B. The floor of the second floor dwelling unit 2B is made of flooring, for example, like the first floor floor 8A. On the other hand, the floor of the second floor indoor common area 3B is made of, for example, cement boards.

[0026] [ceiling] The ceiling 9 of this embodiment is configured to include a first floor ceiling 9A and a second floor ceiling 9B. In this embodiment, a space between the first floor ceiling 9A and the second floor floor 8B is formed. In addition, an attic 14 is formed between the second floor ceiling 9B and the roof 10.

[0027] [Floor insulation structure] Each of the multiple dwelling units 2 in this embodiment has a floor insulation structure 21. In this embodiment, the floor insulation structure 21 is formed by placing floor insulation material 22 on the floors 8 of the multiple dwelling units 2. The floor insulation material 22 in this embodiment is placed on the underside of each of the floor 8A of the first-floor dwelling unit 2A and the floor 8B of the second-floor dwelling unit 2, but may be placed only on the underside of the floor 8A of the first-floor dwelling unit 2A, for example.

[0028] In the apartment building 1 of this embodiment, the floor insulation structure 21 can suppress the flow of heat between the first-floor dwelling unit 2A and the underfloor space 12, and between the second-floor dwelling unit 2B and the inter-floor space 13. This can maintain cool conditions in the multiple dwelling units 2 in the summer and warm conditions in the winter. This improves the comfort of the multiple dwelling units 2. Furthermore, when each dwelling unit 2 is air-conditioned by an air conditioner (not shown), the improved insulation of each dwelling unit 2 increases the air-conditioning efficiency of the air conditioner. This can reduce the air-conditioning costs of the air conditioner in each dwelling unit 2.

[0029] The floor insulation material 22 may be a conventional insulation material, such as, but not limited to, a plate-shaped material such as polystyrene foam, urethane foam, or phenol foam.

[0030] [Common area basics] Fig. 3 is a plan view of the foundation 5. Fig. 3 corresponds to the AA cross section of Fig. 1. As shown in Figs. 1 to 3, the indoor common area 3 of this embodiment includes a common area foundation 23 that surrounds the indoor common area 3. In Fig. 3, the common area foundation 23 is shown in color.

[0031] In this embodiment, the common area foundation 23 is the foundation of the portion of the foundation 5 provided in the apartment building 1 that surrounds the indoor common area 3 (dividing the indoor common area 3A on the first floor). In this embodiment, the foundation that divides the dwelling units 2A on the first floor, excluding the portion divided by the common area foundation 23, is specified as the dwelling unit foundation 24. The common area foundation 23 and the dwelling unit foundation 24 are configured to include the base portion 5a and the rising portion 5b shown in FIG. 2.

[0032] The common area foundation 23 of this embodiment is configured to include a first portion 23A and a second portion 23B. In Fig. 3, the second portion 23B is shown in a darker color than the first portion 23A.

[0033] The first portion 23A is intended to separate the indoor common area 3 from the outdoors 19. Meanwhile, the second portion 23B is intended to separate the indoor common area 3 from the plurality of dwelling units 2. In this embodiment, of the perimeter L of the indoor common area 3 (the horizontal length along the width center line C of the rising portion 5b), the perimeter L1 of the first portion 23A is set to be greater than the perimeter L2 of the second portion 23B. Therefore, the ratio L1 / L2 of the perimeter L1 to the perimeter L2 is greater than 1.0.

[0034] [Insulation for common area foundations] The common area foundation 23 is provided with a thermal insulation material 25 for insulating at least a portion of the common area foundation 23. This thermal insulation material 25 is similar to conventional foundation insulation, and may be made of, for example, the same material as the floor insulation material 22 (shown in FIG. 1) described above. As shown in FIG. 2, the thickness W of the thermal insulation material 25 is set appropriately and may be set, for example, to about 40 to 80 mm.

[0035] The heat insulating material 25 of this embodiment is arranged along the rising portion 5b of the common area foundation 23. Furthermore, the heat insulating material 25 of this embodiment extends continuously from the upper end of the rising portion 5b to the lower end (the upper end of the base portion 5a).

[0036] In the apartment building 1 of this embodiment, the insulation material 25 provided in the common area foundation 23 prevents heat, cold, etc. from the outdoors 19 from being transmitted to the indoor common area 3 via the common area foundation 23 and the floor (earthen floor 11A) of the indoor common area 3B on the first floor adjacent to the common area foundation 23. This keeps the indoor common area 3 cool in the summer and warm in the winter. This improves the comfort of the indoor common area 3.

[0037] Furthermore, when the indoor common area 3 is air-conditioned by the air conditioner 4 shown in Fig. 1, the air-conditioning efficiency of the air conditioner 4 is increased due to the improved insulation of the indoor common area 3. This can reduce the air-conditioning cost of the air conditioner 4.

[0038] As shown in Figures 2 and 3, the heat insulating material 25 is preferably provided in the first portion 23A that separates the indoor common area 3 from the outdoors 19. This prevents heat, cold, etc. from the outdoors 19 from being transmitted to the indoor common area 3 via the first portion 23A and the earthen floor 11A (shown in Figure 2). This improves the comfort of the indoor common area 3. To effectively exert this effect, the heat insulating material 25 is preferably disposed around the entire periphery of the first portion 23A shown in Figure 3.

[0039] The heat insulating material 25 may be provided in the second portion 23B that separates the indoor common area 3 from the plurality of dwelling units 2. This prevents heat and cold from the underfloor space 12 of the dwelling units 2 from being transmitted to the indoor common area 3 via the second portion 23B and the earthen floor 11A. This improves the comfort of the indoor common area 3. To effectively exert this effect, the heat insulating material 25 is preferably disposed around the entire periphery of the second portion 23B.

[0040] In the apartment building 1 of this embodiment, the insulation of the dwelling unit 2 is ensured by the floor insulation structure 21 of the dwelling unit 2, so no insulation material 25 is provided on the dwelling unit foundation 24. This prevents the insulation material 25 from increasing more than necessary, and the construction cost of the apartment building 1 can be reduced.

[0041] [Apartment building (second embodiment)] Incidentally, underground heat (geothermal heat below the earthen floor 11), which does not change much in temperature throughout the year, is transmitted to the earthen floor 11 that separates the underfloor space 12 shown in Figures 1 and 2. Therefore, the air in the underfloor space 12 exchanges heat with the underground heat via the earthen floor 11. Furthermore, since the underfloor space 12 is separated by the foundation 5 and the first floor 8, it is shielded from sunlight. For this reason, in the summer, the temperature of the underfloor space 12 may become as low as the temperature of the air-conditioned indoor common area 3. Therefore, if the cool air from the underfloor space 12 could be transmitted to the indoor common area 3 via the second portion 23B and the earthen floor 11A, the indoor common area 3 could be cooled, which is thought to improve the comfort of the indoor common area 3.

[0042] 4 is an enlarged view of the foundation 5 of an apartment house 1 according to another embodiment of the present invention. In this embodiment, only the first portion 23A is provided with the thermal insulation material 25. Therefore, the second portion 23B is not provided with the thermal insulation material 25 (shown in FIG. 2).

[0043] In the apartment building 1 of this embodiment, the first section 23A is provided with a thermal insulation material 25, which, as in the previous embodiments, prevents heat and other heat from the outdoors 19 from being transmitted to the indoor common area 3 via the first section 23A and the earthen floor 11A. On the other hand, the second section 23B is not provided with a thermal insulation material 25, so that in summer, cool air from the underfloor space 12, which is cooler than the indoor common area 3, is transmitted to the indoor common area 3 via the second section 23B and the earthen floor 11A. In this embodiment, the indoor common area 3 is cooled by the cool air from the underfloor space 12, improving the comfort of the indoor common area 3 and further increasing the air conditioning efficiency (cooling efficiency) of the air conditioner 4. Furthermore, because the thermal insulation material 25 in the second section 23B is omitted, the construction costs of the apartment building 1 can be reduced.

[0044] On the other hand, in winter, although heat is exchanged between the air in the underfloor space 12 and geothermal heat, the underfloor space 12 is shielded from sunlight and no insulation 25 is provided in the dwelling unit foundation 24, so the temperature of the underfloor space 12 tends to be lower than the temperature of the indoor common area 3. Furthermore, compared to the temperature difference between the underfloor space 12 and the indoor common area 3 in summer, the temperature difference between the underfloor space 12 and the indoor common area 3 in winter is likely to be larger. For this reason, if insulation 25 is not provided in the second portion 23B, the cold air in the underfloor space 12 in winter will be transmitted to the indoor common area 3 via the second portion 23B and the earthen floor 11A, and the comfort of the indoor common area 3 and the air conditioning efficiency (heating efficiency) of the air conditioner 4 may not be sufficiently improved.

[0045] In this way, if the insulation material 25 is uniformly provided only in the first part 23A, even if the comfort of the indoor common area 3 and the air conditioning efficiency of the air conditioner 4 can be improved in the summer, these may not be sufficiently improved in the winter.

[0046] Note that when the difference (W1-W2) between the heat loss amount W1 of the indoor common area 3 (shown in FIG. 4) in which the insulating material 25 is provided only in the first portion 23A and the heat loss amount W2 of the indoor common area 3 (shown in FIG. 2) in which the insulating material 25 is provided in both the first portion 23A and the second portion 23B is small, the improvement in the heat insulating performance (reduction in the heat loss amount) due to the insulating material 25 of the second portion 23B is small. In this case, the heat insulating performance of the insulating material 25 of the first portion 23A dominates the heat loss amount of the indoor common area 3. Here, each of the heat loss amounts W1 and W2 is determined as the sum of the heat inflow into the indoor common area 3 in summer and the heat outflow in winter.

[0047] In this way, in the indoor common area 3 where the difference (W1-W2) is small, the improvement in thermal insulation performance due to the insulating material 25 of the second portion 23B is small, so even if the insulating material 25 of the second portion 25B is omitted, it is possible to prevent a decrease in comfort in the indoor common area 3 in winter. Furthermore, omitting the insulating material 25 of the second portion 25B improves comfort in the indoor common area 3 in summer.

[0048] Furthermore, as a result of extensive research, the inventors have found that there is a correlation between the difference in heat loss (W1-W2) and the ratio L1 / L2 of the perimeter length L1 of the first portion 23A to the perimeter length L2 of the second portion 23B. They have also found that in a common area foundation 23 configured with a ratio L1 / L2 in which the difference in heat loss (W1-W2) is equal to or less than a predetermined reference value S, providing insulation 25 only in the first portion 23A can improve comfort in summer while suppressing a deterioration in winter comfort. The reference value S is set appropriately depending on the size of the indoor common area 3, the upper limit of heat loss required for the indoor common area 3, and the like, and is set to, for example, 50 to 150 W (100 W in this example).

[0049] Fig. 5 is a graph showing the relationship between the difference in heat loss (W1-W2) in the indoor common area 3 and the ratio L1 / L2 of the perimeter length L1 of the first portion 23A to the perimeter length L2 of the second portion 23B. Figs. 6(a) and 6(b) are plan views showing foundations 5 of apartment buildings 1 having different ratios L1 / L2 of the perimeter length L1 of the first portion 23A to the perimeter length L2 of the second portion 23B. The ratio L1 / L2 in Fig. 6(a) is 0.16. The ratio L1 / L2 in Fig. 6(b) is 0.44. The ratio L1 / L2 of the apartment building 1 shown in Fig. 3 is 1.30.

[0050] In this embodiment, the heat loss amount W1 when the insulation material 25 is provided only in the first portion 23A and the heat loss amount W2 when the insulation material 25 is provided in both the first portion 23A and the second portion 23B were calculated for the apartment house shown in FIG. 6(a) (ratio L1 / L2: 0.16), the apartment house shown in FIG. 6(b) (ratio L1 / L2: 0.44), and the apartment house shown in FIG. 3 (ratio L1 / L2: 1.30). These heat loss amounts W1 and W2 were calculated by computer simulation. Then, for each apartment house, the perimeter ratio L1 / L2 and the difference in heat loss amount (W1-W2) were plotted, and the approximate curves were identified to create the graph shown in FIG. 5. The calculation conditions were as follows: Apartment complex: 3-story building (floor height: 2.4m) summer: Outside temperature: 35℃ Indoor common area temperature: 26℃ Underfloor space temperature: 25℃ Ground temperature: 62℃ Attic temperature: 45℃ Temperature of the exterior wall surface: 44°C winter: Outside temperature: 5℃ Indoor common area temperature: 20℃ Underfloor space temperature: 10.5℃ Ground temperature: 5℃ Attic temperature: 10℃ Temperature of the outer surface of the exterior wall: 5℃

[0051] As shown in FIG. 5, when the ratio L1 / L2 is in the range of 0.4 to 1.0, the difference in the amount of heat loss (W1-W2) is small and satisfies the standard value S.

[0052] In an indoor common area 3 where the ratio L1 / L2 is 1.0 or less (shown in FIG. 6(b)), the perimeter length L2 of the second portion 23B is set to be relatively large compared to an indoor common area 3 where the ratio L1 / L2 is 1.0 or more (shown in FIG. 3). In such an indoor common area 3, the insulation material 25 is omitted from the second portion 23B, so that cool air in the underfloor space 12 in the summer is effectively transmitted to the indoor common area 3, thereby reducing the amount of heat inflow in the summer.

[0053] On the other hand, in the indoor common area 3 (shown in FIG. 6(b)) where the ratio L1 / L2 is 0.4 or more, the perimeter length L2 of the second portion 23B is prevented from becoming larger than necessary, compared to the indoor common area 3 (shown in FIG. 6(a)) where the ratio L1 / L2 is less than 0.4. As a result, even if the insulating material 25 of the second portion 23B is omitted, the transmission of cold air from the underfloor space 12 in winter to the indoor common area 3 can be minimized, and the amount of heat loss in winter is reduced.

[0054] Therefore, in an apartment building 1 having an indoor common area 3 with a ratio L1 / L2 of 0.4 to 1.0, it is preferable to provide the insulating material 25 only in the first portion 23A, as shown in FIG. 4. This improves the comfort of the indoor common area 3 in summer while maintaining the comfort of the indoor common area 3 in winter. Furthermore, omitting the insulating material 25 in the second portion 23B can reduce the construction costs of the apartment building 1. To effectively achieve this effect, it is preferable to provide the insulating material 25 only in the first portion 23A in an indoor common area 3 with a ratio L1 / L2 of 0.5 to 0.8.

[0055] In an apartment building 1 having an indoor common area 3 (shown in FIGS. 3 and 6(a)) where the ratio L1 / L2 is outside the above range, it is preferable to provide the heat insulating material 25 in both the first portion 23A and the second portion 23B as shown in FIGS. 1 to 3, as in the previous embodiments. This can prevent a decrease in comfort in the indoor common area 3 in summer and winter. Therefore, it is possible to improve the comfort of the indoor common area 3 and the air conditioning efficiency of the air conditioner 4.

[0056] Although a particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment and can be modified and implemented in various ways.

[0057] [Note] The present invention includes the following aspects.

[0058] [Invention 1] It is an apartment building, Multiple dwellings and an indoor common area that faces the plurality of dwelling units and is a common space separated from the outside air; an air conditioner for supplying conditioned air to the indoor common area; Each of the plurality of dwelling units has a floor insulation structure, The indoor common area includes a common area foundation surrounding the indoor common area, The common area foundation is provided with a heat insulating material for insulating at least a part of the common area foundation. apartment complex. [Invention 2] The common area foundation includes a first portion that separates the indoor common area from the outdoors, and a second portion that separates the indoor common area from the plurality of dwelling units, The apartment building according to claim 1, wherein the heat insulating material is provided in the first portion. [Invention 3] The apartment building according to claim 2, wherein the heat insulating material is provided in the second portion. [Invention 4] a ratio L1 / L2 of a circumferential length L1 of the first portion to a circumferential length L2 of the second portion is 0.4 to 1.0; 3. The apartment building according to claim 2, wherein the heat insulating material is provided only in the first portion. [Explanation of symbols]

[0059] 1 Apartment complex 2 dwelling units 3 Indoor common area 4. Air conditioners 23 Common area basics 25 Insulation

Claims

1. It is an apartment building, Multiple dwellings and an indoor common area that faces the plurality of dwelling units and is a common space separated from the outside air; an air conditioner for supplying conditioned air to the indoor common area; Each of the plurality of dwelling units has a floor insulation structure, The indoor common area includes a common area foundation surrounding the indoor common area, The common area foundation is provided with a heat insulating material for insulating at least a part of the common area foundation. apartment complex.

2. The common area foundation includes a first portion that separates the indoor common area from the outdoors, and a second portion that separates the indoor common area from the plurality of dwelling units, The apartment building according to claim 1 , wherein the heat insulating material is provided in the first portion.

3. The apartment building according to claim 2 , wherein the heat insulating material is provided in the second portion.

4. a ratio L1 / L2 of a circumferential length L1 of the first portion to a circumferential length L2 of the second portion is 0.4 to 1.0; The apartment building according to claim 2 , wherein the heat insulating material is provided only in the first portion.

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