Research trend and results

Study of how to grasp design information toward
understanding the performance evaluation of existing homes
Housing Department : TAKAHASHI Satoru, Research Coordinator for Housing Warranty
Housing Planning Division : MORI Masashi, Head
Housing Production Division : NUNOTA Ken (PhD, Engineering) ,HeadSUMIKURA Hideaki (PhD, Engineering), Researcher

Existing houses, Wooden detached house, Construction methods（Keywords）

conventional wooden house construction methods,

1, Introduction
In the Ministry of Land, Infrastructure,
TransportandTourism,

weorganizeand have been built along the transition of theCorporation generally specification. However, anandaspect of the variation due to regional differences

distribution of existing home" in March 2012. Inand production building, have almost not beenline with this plan, we are promoting several

investigated so far.

"Comprehensive

planforrenovation

housing

Therefore, for the aim of understanding theperformance indication system, or expansion ofrealities of the design and specifications of an

residentialfor

existing wooden detached house built by theimprovement of durable and quality of housing

regional small and medium housing builder

stock. In National Institute for Land andcompanies, we conducted a survey of existing

Infrastructure Management, We are developing

homes publications of the drawings available,of techniques and methods that can evaluate thewhich were built by home building companies

performance of the housing, even in situations

with a proven track record of supplying housing

where the design drawings or specifications arewhich complying with GHLC specifications overscattered and lost.(1).

the past 30 years. Using the research method ofmeasures,that

dissemination

history

informationofsystem,

In this paper, we will report on the survey on

extracting a description indicating the materials

the design specifications of the existing house,and construction method, which is used by thewhich was carried out as part of the study ofdrawings that are stored, we recorded the data bymethods to estimate the characteristics of eachage and material of the structure of the housing,part from housing distribution, for designon the actual conditions of the construction

information underlying on the basic of themethods.

performance

homes

The survey up to FY 2012, we have gained the(Information of used materials and part material

data obtained about 650 of wooden detachedcomponents).

house by 14 builders in Hokkaido, Tohoku, Kanto,evaluationofexisting

Chubu, and Chugoku area.
2. Cases overview and analysis of research on
design specifications

Figure is obtained by plotting items oftransition period related to description of GHLC

As data to estimate the materials andspecifications for each builders. We gained theconstruction methods of wooden house, “Thesummary of the item that GHLC specifications isspecifications of the Government Housing Loan

leading and the item which has less relationship

Corporation (GHLC specifications)” is a leadingin terms of the timing for the introduction ofmaterial. We have considered the so-called

materials and construction methods of eachResearch trend and resultsbuilder for corporation for the transition of the【Reference】

specification shown in Red-wave-line. On the1) Comprehensive Technology Development Projects"Development on performance evaluation technologies
for home inspection to reduce uncertainty of existinghome sales (2011-2014)"

other hand, in order to grasp the regional trend, it
will be necessary to obtain more data.

http://www.mlit.go.jp/tec/gijutu/kaihatu/pdf/soupro011.pdf

Figure: Transition period of design specifications
3. Subject of future investigation
For

existing

homes

thedrawing

wasdissipated, we plan to develop a database of thetransition of the design specification with highaccuracy for the establishment of a method as aclue to set the "Considered Specifications" deemedthecharacteristics

ofthematerials

andconstruction methods to retrieve data and toexpand the broader realities of construction cases.