Research Trends and Results

Research on Diagnostic Costs for Exterior
Walls of Buildings
MAKATAYAMA Miho (Dr. Eng.),HeadHousing Stock Division , Housing Department
KAGE Tadatsugu (Dr. Eng.), Research Coordinator for Quality Control of Building
Building Department
NEMOTO Kaori (Dr. Eng.), Senior Researcher
KOGA Junko (Dr. Eng.), Senior Resercher
Structural Standards Division, Building Department(Key words) Exterior wall diagnosis, Diagnostic costs, Periodical report system
1. Introduction
Inasmuch as professional knowledge andtechnology are required for research/diagnosis
for mortar finished exterior walls, although it isgenerally asked of building diagnosis operators,
with reference to the diagnostic cost proposedfrom the operators, a great many havecommented on the inability to judge whether or
not it is a fair price. Information on researchcosts is scarcely publicized and information asserving as materials for these judgments has yet
to be improved.
Based on this situation, in order tocomprehend prices and price compositions or
the like in the research diagnosis for exterior
walls, we carried out a questionnaire survey
targeting building diagnostic operators.

2. Research method
In the survey, we configured two categories
of RC condominiums (5 story/gross floor area
1,814m2: Building A and 11 story
building/5,887m2: building B) as modelbuildings, and collected information on
exterior wall diagnosis costs by percussion
diagnosis and infra-red rays, operation items
and those compositions in the estimate, andthe standard unit prices of each operation.
In calculating the costs, on the presumptionof a case when required for “diagnosis only”
exists in multiple classes in ordinary
diagnostic operations, we asked forsubmission of data capable of examining eachcost.
In consideration of regional characteristics
and firm size for these surveys, we divided
the whole nation into six areas and collected
data from research diagnostic operators.
3. Outline of survey results
1) Diagnostic costs by percussion method

In regard to the estimated amount of thepercussion method, the variability of the total
costs (direct cost, temporary stage +miscellaneous expenses) was great and themaximum/minimum reached to about 30
times in two model cases. In this survey, due
to the condition of the temporary stage to be
configured by the operators’ side, the costs oftemporary stages between the one by strut
scaffolding and the place employing gondolasor high-elevation operating vehicles spread to
50 times in the cost of temporary stage cost
only (Figure 1). In the cost examination, it
was reconfirmed that the confirmation ofconditions for temporary stages became onepoint.
2) Diagnostic costs by infrared ray method
Although the variability of total costs issmaller than the case of the percussion
method, nonetheless, the maximum/minimum
spread to about nine times. In the case ofinfrared ray survey, the ratio occupied byonsite photographing and analysis operations
in direct costs is large, having a spread of
more or less ten times (Figure 2). In respect tothis point, since there were few operators
using high-elevation operating vehicles, it isconsidered the cost difference occurred due tothis.
In general, the survey on the north surface isdifficult by the infrared method. In the survey
this time, inasmuch as there were operators tohave examined cost calculations based on thepossibilities of such diagnosis, knowledge inreference to materials to the judge appropriatetechnical strength was gained.
4. Conclusion
Concerning these survey results, we areprepared to publicize as the data for building

800
調査費

700

単面積当たりの費用（円/㎡）

600
500

平均値：463円/

400
300
200
100

600
500
400

200
100
02

3456789 10 11 12 13 14 15 16 17 18 19
企業No.

1owners and so forth to utilize in examining
survey3,000
and diagnostic costs.
2,000
1,500
1,000

平均値：587円/㎡
5003456788

9 10 11 12 13 14 15 16 17 18 19
企業No.

Temporary仮設費等
stage cost, etc.

Average value: ¥573/m2
平均値：573円/㎡

operating vehicles areutilized.

500

平均値：273円/㎡
平均値：382円/㎡

20030012345678

9 10 11 12 13 14 15 16 17 18 19
企業No.

5,000 05678

9 10 11 12 13 14 15 16 17 18 19Company No.
企業No.

経費

1,600

Bマンション（外壁面積 3,300㎡）

1,400
800
1,200700
1,000注）対壁面積の単位面積あたりの費用

Surveycost Note) Cost per unit area of wall
調査費

平均値：315円/㎡

400
400

0200

平均値：288円/㎡
Averagevalue: ¥288/m2
2 3 4 5 6 7 81100

9 10 11 12 13 14 15 16 17 18 19
企業No.

5,00001 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
合計
企業No.

4,500

4,000
800
3,500

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
合計
CompanyNo.
企業No.

4,500

4,000
Figure800
3,500

2: Estimate costs distribution (Direct survey cost incase
経費
700
3,000
of2,500
infrared ray method/Bld. B)

経費

700
3,000

2,500
600
2,000500
諸 1,500
400
1,000600
2,000
500
1,500
400
1,000

平均値：1323円/㎡300
500

平均値：1299円/㎡300500

平均値：163円/㎡23456789 10 11 12 13 14 15 16 17 18 19
企業No.

00200

123410056789 平均値：125円/㎡
10 11 12 13 14 15 16 17 18 19
企業No.

0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
企業No.
1,600

合計

1,200

1,400

単面積当たりの費用（円/㎡）

1,600

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
企業No.

合計

1,200
1,000

800600

平均値：578円/㎡200
0600
4002000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
企業No.

A団地（外壁面積 1,500㎡）

800

800

A団地（外壁面積 1,500㎡）

調査費
700
800
600
平均値：444円/㎡
調査費
700
500
平均値：463円/
直600
接400
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
18 19 20500
21 22 23 24 25 26 27 28平均値：463円/
調直300
企業No. 査接400
費調 200300
査
100
費
200
0
100 1 2 3 4 5 6 7 8 9 10 11 12 13 1
企業No.
0
1 2 3 4 5 6 7 8 9 10 11 12 13
3,000
企業No.

単面積当たりの費用（円/㎡）
単面積当たりの費用（円/㎡）

1,000

2,5003,000

単面積当たりの費用（円/㎡）
単面積当たりの費用（円/㎡）

1100

400

4200300100

1,4003500
600

400
400

02002600
800

500
600

0200

1

単面積当たりの費用（円/㎡）
単面積当たりの費用（円/㎡）

単面積当たりの費用（円/㎡）
単面積当たりの費用（円/㎡）

調査費

600
800

単面積当たりの費用（円/㎡）
単面積当たりの費用（円/㎡）

7

Figure 1: Estimate costs distribution (temporary stage cost, etc.
1,800/Bld.
A
A団地（外壁面積 1,500㎡）

1,400
800
1,200700
1,000

単面積当たりの費用（円/㎡）6*Small temporary★仮設費が小さいのは、
stagecosts
are cases
ゴン ドラ、高所作業
where
車やブgondolas,
ラ ンコを利用
high-elevation
する ケース1,000

9 10 11 12 13 14 15 16 17 18 19
企業No.

経費

1,600合計

5★突出して高額なのはParticularlyhigh priced
支柱足場によ る 仮設
temporary stage by strut
scaffolding

1,500area (¥/m2)
Cost per unit
単面積当たりの費用（円/㎡）
単面積当たりの費用（円/㎡）

2

1,800

経費
等

401合計

3Note) Cost per unit area of wall
注）対壁面積の単位面積あたりの費用

2,0000

諸経費
等直接調査費22,500

Cost per unit area (¥/m2)

単面積当たりの費用（円/㎡）

3,000

仮設費等

2,500

単面積当たりの費用（円/㎡）

1

仮設費

平均値：412円/㎡

3000.

調査費

700

2,000
2,500

仮 1,5002,000設
費仮 1,000
1,500
設
費

500
1,0000500
12345678

9 10 11 12 13 1企業No.

0
1,800

諸経費諸等経費
等

1,600
1,800
1,400
1,600
1,200
1,400
1,000
1,200
800
1,000
600
800
400
600
200
400
0

単面積当たりの費用（円/㎡）
単面積当たりの費用（円/㎡）

直接調
査
費

単面積当たりの費用（円/㎡）

800

12

3456789 10 11 12 13企業No.

経費
経費

平均値：

平均値