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2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012)
                                                                 16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08




SUSTAINING THE DESIGN ELEMENTS INFLUENCE ON THE COMFORT
AND SPATIAL FUNCTIONS IN TRADITIONAL YEMEN HOUSES IN OLD
                       CITY SANA‟A

                Abu Bakar Abdul Hamid1, Ahmad Haqqi Nazali Bin Abdul Razak2
       1
         Pusat Pengajian Senibina Dalaman, Fakulti Senibina, Perancangan & Ukur, 40450,
              UiTM Shah Alam, Selangor, Malaysia. abah7591@salam.uitm.edu.my
       2
         Pusat Pengajian Senibina Dalaman, Fakulti Senibina, Perancangan & Ukur, 40450,
               UiTM Shah Alam, Selangor, Malaysia. haqqi250@perak.uitm.edu.my


Abstract

This research endeavors to study the sustainability design elements of traditional vernacular in the Old City
Sana’a in Yemen. The study is going to investigate outlook of enthusiasm respondents, level of preference and
pleasure in organize to provide a narrative of the Yemeni houses criteria, unique features and future conceptions
for comfortable and spatial functions. In this approach, the features of the houses in the area might rediscover
for future indication. This study will support with literature on the general explanation overview of location and
geographical, climate and spatial design elements. The study will included the explanations about the spatial
design in Old City Sana’a, multi-design in traditional tower houses in Old City Sana’a, the issues and factors
affecting the design of traditional tower houses in Old City Sana’a. Some of several methods have been chosen
to get the good consequence, such as observations, measurements and questionnaires to study the comfortable
and spatial functions from the respondents that include the landlord, public people and the professional
organizations. The information will be compiled from the survey and collected to analyze the data based on
responses from the respondent’s response. The conclusion in this study will intend the design guidelines and
recommendation for future house and includes design aspects related to the house arrangement layout, the
purpose of traditional design, the traditional building material, the Islamic ethics in house include the exterior
appearance and thermal comfort conditions.

Keywords: Traditional Tower House, Sustainable, House Design, Yemeni Architecture, Vernacular.

1.         Introduction

           Yemen is the land with the peaceful for a long time centuries since period of Prophet Muhammad SAW
           till presently by foreign awareness and chaos. Since a long time ago, all the cities and buildings is
           constant existing over two and half thousand years in wide area with covered some of climate (summer
           and winter) and gorgeousness panorama between buildings of different regions and culture. Therefore
           this country was regarded as an ancient city, there are has qualities, distinctively Yemeni, which will be
           seen throughout the country with the traditional and styles itself.

           In the Sana‟a vernacular traditional, some aspect should be considered such as a tradition and qualities
           to show the best elements and characteristic they have. The traditional Old Sana‟a city is normally
           having seven or eight storey with tall generously decorated towers, and decorated with crowding one
           another into the already-narrow alleys. A house, possibly linked by a small yard where is will use it at
           the lower levels, less of number window at store rooms, to elevate the living space above from the
           smells and noisy from the streets and to provide a secure barrier against intruders.

           Regarding the traditional house in Old Sana‟a city, basically the first or second storey was is linked in
           the yard area where the kitchen area is located. Why the kitchen is located at that storey? The reason is
           to hidden the sight from the men of the house and their guests. Another part area, a toilet basically
2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012)
                                                                 16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08

         designing through a channel or hole in the stone floor where to make easy the for the sewage system go
         out to through the drainage into a hole in the ground in the yard or directly into the street. For the water
         sources, the system are designing where is the water drawn from a well and carried by the women to the
         kitchen or by pump to a storage tank on the roof.

         The culture in Yemen was amazing and fully with lifestyle and harmonies. The architectural and
         exterior structures of house are distinctive and sustain follow by time line. A lot of house design in Old
         Sana‟a city are higher is more than 6 storey. The house goes up with the narrow vertical staircase and
         passage does not go too linked with the living area. This maze of rooms is creating confusion because
         sometimes got many numbers as sixty in all. Sometimes the visitor also confuses with the direction and
         changes in level between the corridors and doors, is very mysteriously with the variation place. Talking
         about the living room, is was huge because some activities were been here and depending the needed of
         the moment or the style of the householder.

         The most amazing and splendid of the rooms is located at the top house, is called as ‘muffrage’, where
         is a place functionally for meeting, smoking, talking and chewing ‘qat’. As like others room, the
         ‘muffrage’ ceiling and walls are white coloring, but it covered with the plaster and some of the plaster
         got carving with fully patterns around the doors and windows. The nice and beautiful part is at the top
         of windows, there are has some curving decoration with the colorful glass is called ‘al-qammariah’.
         Usually, the carvings at the top of windows will portray from the Quran, natural forming or wall-panels
         in Arabic script. The window itself is covered around and facing at the north part of wall of the
         ‘muffrage’ with huge the semi-circular openings tracing with the colored glass. When the sun going up,
         the natural light will going in through the windows and reach down close to the floor to guide the guests
         to the seating on floor-cushion. The ‘muffrage’ is furnished with the lower cushion is called ‘majlis’
         with carpet together in colorful with the contrast to the plain whiteness in the room.

         Most of the houses in Old Sana‟a city built from the stone, brick or mud-block, and sometimes is
         constructing of all three. The construction may be made from the specialist craftsmen or by the
         householder himself, even the quarry also from his own stone and mould his own mud-blocks. The all
         things are very cheaper, high quality and less maintenance required. Furthermore, the technique and
         materials of construction in Yemen are well-suited with the climate here where high daytime
         temperatures and often bitterly cold nights are. The good quality and selection of material for walls and
         roof are to make sure when the day's heat for night-time use can sustain from the inside the house and
         comfortable temperature without the use of heating or ventilation systems.

2.       Literature Review

         Yemen is the part of the Arab country where is located on the southwestern of the Arabian Peninsula in
         an area the Romans called "Arabia Felix" because of its abundant richness along with the surrounding
         desert. It‟s also known as Arab Peninsular because is located south part of Middle East.

         At another part, at the central highland the capital of the Yemen Arab Republic and one of the oldest
         cities in the world is called Sana'a. This city is surrounding by elevated wall to protect the city from the
         enemies attack. It is also show the character of traditional Arab cities and the unique style from
         Southern Arabia. The most famous about that city is tower house, which is appearing above to narrow
         and winding streets of the old city.

         The Yemeni traditional tower houses impress to the visitor with their height view. A lot of houses are
         more than five stories height and the largest commonly having seven, eight or even nine stories. A view
         of the city from a distance, with many hundreds of these houses towering above the city walls, makes
         an unforgettable impression.

         Most of the tower houses were arid with close related family. They were normally built for one space
         family; old houses may have two or even three closely related families living in them.
2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012)
                                                                  16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08




2.1       House Design Definition

          According to the Arabic dictionary Al-Munjid (Al-Balabki, 1987), verify that a house (Al-Sakan) means
          a place, “…to settle down, relax, become calm, calm down, reside in a place, and house unit." In Oxford
          Dictionary (Allen, 1987), a house is defined as “…a building for human habitation.” It covers the
          “…dwelling of houses as a provision of shelter or lodging.‟ The United Nations (United Nations, 1977)
          defines a house not only as a shelter but also as a mean of the creation of communities. House design
          means the quality of the house layout in terms of the organization and the allocation of living space
          areas relative to the key functions that a household requires which is space planning and function. Such
          a layout always sets to measure the quality of a house. It has been suggested by Caudill (1978) that an
          adequate layout always takes care of both the current and the future needs; and such needs may be
          evaluated on the basis of quality rather than the cost, size and building that make up the physical
          environment that the residents interact with. Therefore, the living space in house design that the people
          creates should meet a kind of needs, and the design capability calls for the ability of the designer to put
          all the needed elements within a defined and cleared interaction.

2.2       Types of the Activities in the Traditional Tower House.




                             Figure 1: The types of the activities inside the traditional tower house.


          According to Figure 1, it shows the activities in Yemen traditional tower house which there are three
          parts of the activities of religious, cultural and social. To sustain the elements of Yemen traditional
          houses, the owners and architects role is important to maintain the design characteristics and elements.
          All the activities in Yemen in the house are very important to sustain tradition in their respective roles.




                                     Figure 2: The activities for each level inside the tower house.
                                                   Source: Ronlad Lewcock (1986)

          According to Figure 2, it shows the activities for each level in the Yemen traditional tower house.
          Based on the figure, the ground level was located for stable and wood store. The Yemen ancient people
          usually kept their animals, goods, vegetables, fruits, wheat grains and wood this level. Some goods they
          also kept on the next level. The next floor, they are has rooms for reception, Diwan, kitchen and
          personal room include bathrooms in each room. At the sixth level, there are has open roof. Usually they
          will chew „qat‟ and take rest. The upper level is called „maffraj‟ for rest area, meeting friends and event
          such as wedding ceremony.
2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012)
                                                                 16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08



3.       Methodology

       1. The research method includes all the stages of work that will make the research carry on efficiently, and
          in perseverance way and that are used to find out the data collection.

       2. Data collection is divided into two methods. The first method is the secondary data which is used to
         find out the literature review from the books, journals and articles from websites, magazines or local
         newspaper.

       3. The second method is the primary data will be obtained from a structured interview with the experts,
         observation, measurements and close ended questionnaires to get a sufficient data that is related to the
         topic.

4.       Result and Analysis

         Results and data analysis, has shown that retention of elements in the traditional house design is a key
         factor of concern in sustaining of perfection and comfort in the room. There are various factors to be
         considered in determining the comfort and function space. Among others the decorations in the room,
         such as opening windows and diwan, size and function space, arrangement of indoor spaces, and
         thermal comfort.

         The traditional tower houses and urban design of Sana‟a followed certain conventions that were well
         known and practiced by all its inhabitants. These conventions are history-long experiences that have
         been developed throughout the life of the city to satisfy the human socio-cultural and comfortable
         environment needs to respond to the requirements of design elements and environment. The people‟s
         surviving by these conventions resulted in a consistent architectural language that gave a very unique
         identity to Sana‟a architecture and conserved it for long time. Sana‟a traditional tower houses are
         bounded by beautiful views of green garden and skyline of the decorated towers, façade and minarets,
         all with a background of ranges of mountains and mosques.

5.       Conclusion

         The traditional tower house of Yemen has always been known for its strong character remarkable
         identity, deep cultural meaning, and ecological harmony. The objectives were achieved by obtaining of
         primary and secondary data of documentations, primary data through structured interviews with experts
         in this house, also by the use of questionnaires that were distributed to a random sampling within the
         old city of Sana‟a; also observation process was so useful to obtain the data required.

         In the conclusion, all of the objectives were fulfilled in a sufficient circumstances; the result discovered
         proved that to sustain the natural element and design in the traditional Yemen tower houses is effective
         to achieve the comfortable and functions for the house occupants.

Acknowledgement

I am very thankful to whose encouragement, guidance and support from the initial to the final level to develop an
understanding of the topic. I would like to acknowledge the contributions of the Abu Luhum families, Library
Center for Architectural Training and Studies (CATS) peoples and individuals who involved helping to finish
this research. I also would like to thank my beloved family for their patience and support all the way long may
god bless u all. Finally, I send my regards and blessings for those who supported me in during the completion of
the research.
2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012)
                                                                16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08




References

Al-Oulfi, M, (2000) Characteristics of Yemeni Architecture: Form Sand Directions of Development. Unpublished PhD
Thesis,Shanghai Tongji University, China

Al-Sallal, K. A (1996) Solar Access/Shading And Building Form: Geometrical Study Of The Traditional Housing Cluster In
Sana’a, in Sayigh A. (ed.) Proceedings of the World Renewable Energy Congress, , Vol. 3. Denver, CO: Oxford: Pergamon-
Elsevier Science, pp. 331–334

Al-Sallal, K. A. (2001) The Balanced Synthesis Of Form And Spacein The Vernacular House Of Sana’a: Bioclimatic And
Functional Analysis. Architectural Science Review, 44(4), pp. 419–428

Al-Sallal, K. A., Ayssa, A. Z., and Al-Sabahi, H. A. (1995) Thermal Performance And Energy Analysis For Sana’a
Vernacular House, In Ben Ghadi S. (ed.) Proceedings of Applications on Renewable Energy in Yemen Workshop. Aden University,
Yemen.

Al-Shibany, A.R. & Al-Madhajy, M. (2000). Al-Saluk fi Tashkeel Al-fadhah Al-memari fi Al-Yameen. (Behaviour of the
Architectural Spaces Composition in the Yemeni Clay Architectural). Proceedings of First Scientific Conference of Clay
Architecture on the Threshold of the 21st Century on 10-13th February 2000. Mukalla: Hadhramout University of Science
and Technology.

Damluji, S.S. (1992). The Valley of Mud Brick Architecture Shibam, Tharim and Wadi Hadhramout. London: Garnet
Publishing.

Damluji, S.S. (2007). The Architecture of Yemen: From Yafi to Hadhramout. London: Laurence King Publishing Ltd.

Lewcock, R. (1986), The Old Walled City of Sana’a. Paris: UNESCO.

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Conference ui tm perak2012

  • 1. 2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012) 16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08 SUSTAINING THE DESIGN ELEMENTS INFLUENCE ON THE COMFORT AND SPATIAL FUNCTIONS IN TRADITIONAL YEMEN HOUSES IN OLD CITY SANA‟A Abu Bakar Abdul Hamid1, Ahmad Haqqi Nazali Bin Abdul Razak2 1 Pusat Pengajian Senibina Dalaman, Fakulti Senibina, Perancangan & Ukur, 40450, UiTM Shah Alam, Selangor, Malaysia. abah7591@salam.uitm.edu.my 2 Pusat Pengajian Senibina Dalaman, Fakulti Senibina, Perancangan & Ukur, 40450, UiTM Shah Alam, Selangor, Malaysia. haqqi250@perak.uitm.edu.my Abstract This research endeavors to study the sustainability design elements of traditional vernacular in the Old City Sana’a in Yemen. The study is going to investigate outlook of enthusiasm respondents, level of preference and pleasure in organize to provide a narrative of the Yemeni houses criteria, unique features and future conceptions for comfortable and spatial functions. In this approach, the features of the houses in the area might rediscover for future indication. This study will support with literature on the general explanation overview of location and geographical, climate and spatial design elements. The study will included the explanations about the spatial design in Old City Sana’a, multi-design in traditional tower houses in Old City Sana’a, the issues and factors affecting the design of traditional tower houses in Old City Sana’a. Some of several methods have been chosen to get the good consequence, such as observations, measurements and questionnaires to study the comfortable and spatial functions from the respondents that include the landlord, public people and the professional organizations. The information will be compiled from the survey and collected to analyze the data based on responses from the respondent’s response. The conclusion in this study will intend the design guidelines and recommendation for future house and includes design aspects related to the house arrangement layout, the purpose of traditional design, the traditional building material, the Islamic ethics in house include the exterior appearance and thermal comfort conditions. Keywords: Traditional Tower House, Sustainable, House Design, Yemeni Architecture, Vernacular. 1. Introduction Yemen is the land with the peaceful for a long time centuries since period of Prophet Muhammad SAW till presently by foreign awareness and chaos. Since a long time ago, all the cities and buildings is constant existing over two and half thousand years in wide area with covered some of climate (summer and winter) and gorgeousness panorama between buildings of different regions and culture. Therefore this country was regarded as an ancient city, there are has qualities, distinctively Yemeni, which will be seen throughout the country with the traditional and styles itself. In the Sana‟a vernacular traditional, some aspect should be considered such as a tradition and qualities to show the best elements and characteristic they have. The traditional Old Sana‟a city is normally having seven or eight storey with tall generously decorated towers, and decorated with crowding one another into the already-narrow alleys. A house, possibly linked by a small yard where is will use it at the lower levels, less of number window at store rooms, to elevate the living space above from the smells and noisy from the streets and to provide a secure barrier against intruders. Regarding the traditional house in Old Sana‟a city, basically the first or second storey was is linked in the yard area where the kitchen area is located. Why the kitchen is located at that storey? The reason is to hidden the sight from the men of the house and their guests. Another part area, a toilet basically
  • 2. 2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012) 16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08 designing through a channel or hole in the stone floor where to make easy the for the sewage system go out to through the drainage into a hole in the ground in the yard or directly into the street. For the water sources, the system are designing where is the water drawn from a well and carried by the women to the kitchen or by pump to a storage tank on the roof. The culture in Yemen was amazing and fully with lifestyle and harmonies. The architectural and exterior structures of house are distinctive and sustain follow by time line. A lot of house design in Old Sana‟a city are higher is more than 6 storey. The house goes up with the narrow vertical staircase and passage does not go too linked with the living area. This maze of rooms is creating confusion because sometimes got many numbers as sixty in all. Sometimes the visitor also confuses with the direction and changes in level between the corridors and doors, is very mysteriously with the variation place. Talking about the living room, is was huge because some activities were been here and depending the needed of the moment or the style of the householder. The most amazing and splendid of the rooms is located at the top house, is called as ‘muffrage’, where is a place functionally for meeting, smoking, talking and chewing ‘qat’. As like others room, the ‘muffrage’ ceiling and walls are white coloring, but it covered with the plaster and some of the plaster got carving with fully patterns around the doors and windows. The nice and beautiful part is at the top of windows, there are has some curving decoration with the colorful glass is called ‘al-qammariah’. Usually, the carvings at the top of windows will portray from the Quran, natural forming or wall-panels in Arabic script. The window itself is covered around and facing at the north part of wall of the ‘muffrage’ with huge the semi-circular openings tracing with the colored glass. When the sun going up, the natural light will going in through the windows and reach down close to the floor to guide the guests to the seating on floor-cushion. The ‘muffrage’ is furnished with the lower cushion is called ‘majlis’ with carpet together in colorful with the contrast to the plain whiteness in the room. Most of the houses in Old Sana‟a city built from the stone, brick or mud-block, and sometimes is constructing of all three. The construction may be made from the specialist craftsmen or by the householder himself, even the quarry also from his own stone and mould his own mud-blocks. The all things are very cheaper, high quality and less maintenance required. Furthermore, the technique and materials of construction in Yemen are well-suited with the climate here where high daytime temperatures and often bitterly cold nights are. The good quality and selection of material for walls and roof are to make sure when the day's heat for night-time use can sustain from the inside the house and comfortable temperature without the use of heating or ventilation systems. 2. Literature Review Yemen is the part of the Arab country where is located on the southwestern of the Arabian Peninsula in an area the Romans called "Arabia Felix" because of its abundant richness along with the surrounding desert. It‟s also known as Arab Peninsular because is located south part of Middle East. At another part, at the central highland the capital of the Yemen Arab Republic and one of the oldest cities in the world is called Sana'a. This city is surrounding by elevated wall to protect the city from the enemies attack. It is also show the character of traditional Arab cities and the unique style from Southern Arabia. The most famous about that city is tower house, which is appearing above to narrow and winding streets of the old city. The Yemeni traditional tower houses impress to the visitor with their height view. A lot of houses are more than five stories height and the largest commonly having seven, eight or even nine stories. A view of the city from a distance, with many hundreds of these houses towering above the city walls, makes an unforgettable impression. Most of the tower houses were arid with close related family. They were normally built for one space family; old houses may have two or even three closely related families living in them.
  • 3. 2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012) 16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08 2.1 House Design Definition According to the Arabic dictionary Al-Munjid (Al-Balabki, 1987), verify that a house (Al-Sakan) means a place, “…to settle down, relax, become calm, calm down, reside in a place, and house unit." In Oxford Dictionary (Allen, 1987), a house is defined as “…a building for human habitation.” It covers the “…dwelling of houses as a provision of shelter or lodging.‟ The United Nations (United Nations, 1977) defines a house not only as a shelter but also as a mean of the creation of communities. House design means the quality of the house layout in terms of the organization and the allocation of living space areas relative to the key functions that a household requires which is space planning and function. Such a layout always sets to measure the quality of a house. It has been suggested by Caudill (1978) that an adequate layout always takes care of both the current and the future needs; and such needs may be evaluated on the basis of quality rather than the cost, size and building that make up the physical environment that the residents interact with. Therefore, the living space in house design that the people creates should meet a kind of needs, and the design capability calls for the ability of the designer to put all the needed elements within a defined and cleared interaction. 2.2 Types of the Activities in the Traditional Tower House. Figure 1: The types of the activities inside the traditional tower house. According to Figure 1, it shows the activities in Yemen traditional tower house which there are three parts of the activities of religious, cultural and social. To sustain the elements of Yemen traditional houses, the owners and architects role is important to maintain the design characteristics and elements. All the activities in Yemen in the house are very important to sustain tradition in their respective roles. Figure 2: The activities for each level inside the tower house. Source: Ronlad Lewcock (1986) According to Figure 2, it shows the activities for each level in the Yemen traditional tower house. Based on the figure, the ground level was located for stable and wood store. The Yemen ancient people usually kept their animals, goods, vegetables, fruits, wheat grains and wood this level. Some goods they also kept on the next level. The next floor, they are has rooms for reception, Diwan, kitchen and personal room include bathrooms in each room. At the sixth level, there are has open roof. Usually they will chew „qat‟ and take rest. The upper level is called „maffraj‟ for rest area, meeting friends and event such as wedding ceremony.
  • 4. 2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012) 16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08 3. Methodology 1. The research method includes all the stages of work that will make the research carry on efficiently, and in perseverance way and that are used to find out the data collection. 2. Data collection is divided into two methods. The first method is the secondary data which is used to find out the literature review from the books, journals and articles from websites, magazines or local newspaper. 3. The second method is the primary data will be obtained from a structured interview with the experts, observation, measurements and close ended questionnaires to get a sufficient data that is related to the topic. 4. Result and Analysis Results and data analysis, has shown that retention of elements in the traditional house design is a key factor of concern in sustaining of perfection and comfort in the room. There are various factors to be considered in determining the comfort and function space. Among others the decorations in the room, such as opening windows and diwan, size and function space, arrangement of indoor spaces, and thermal comfort. The traditional tower houses and urban design of Sana‟a followed certain conventions that were well known and practiced by all its inhabitants. These conventions are history-long experiences that have been developed throughout the life of the city to satisfy the human socio-cultural and comfortable environment needs to respond to the requirements of design elements and environment. The people‟s surviving by these conventions resulted in a consistent architectural language that gave a very unique identity to Sana‟a architecture and conserved it for long time. Sana‟a traditional tower houses are bounded by beautiful views of green garden and skyline of the decorated towers, façade and minarets, all with a background of ranges of mountains and mosques. 5. Conclusion The traditional tower house of Yemen has always been known for its strong character remarkable identity, deep cultural meaning, and ecological harmony. The objectives were achieved by obtaining of primary and secondary data of documentations, primary data through structured interviews with experts in this house, also by the use of questionnaires that were distributed to a random sampling within the old city of Sana‟a; also observation process was so useful to obtain the data required. In the conclusion, all of the objectives were fulfilled in a sufficient circumstances; the result discovered proved that to sustain the natural element and design in the traditional Yemen tower houses is effective to achieve the comfortable and functions for the house occupants. Acknowledgement I am very thankful to whose encouragement, guidance and support from the initial to the final level to develop an understanding of the topic. I would like to acknowledge the contributions of the Abu Luhum families, Library Center for Architectural Training and Studies (CATS) peoples and individuals who involved helping to finish this research. I also would like to thank my beloved family for their patience and support all the way long may god bless u all. Finally, I send my regards and blessings for those who supported me in during the completion of the research.
  • 5. 2012 International Conference on Innovation and Technology for Sustainable Built Environment (ICITSBE 2012) 16-17 April 2012, Perak, MALAYSIA. Ref No.: HC-08 References Al-Oulfi, M, (2000) Characteristics of Yemeni Architecture: Form Sand Directions of Development. Unpublished PhD Thesis,Shanghai Tongji University, China Al-Sallal, K. A (1996) Solar Access/Shading And Building Form: Geometrical Study Of The Traditional Housing Cluster In Sana’a, in Sayigh A. (ed.) Proceedings of the World Renewable Energy Congress, , Vol. 3. Denver, CO: Oxford: Pergamon- Elsevier Science, pp. 331–334 Al-Sallal, K. A. (2001) The Balanced Synthesis Of Form And Spacein The Vernacular House Of Sana’a: Bioclimatic And Functional Analysis. Architectural Science Review, 44(4), pp. 419–428 Al-Sallal, K. A., Ayssa, A. Z., and Al-Sabahi, H. A. (1995) Thermal Performance And Energy Analysis For Sana’a Vernacular House, In Ben Ghadi S. (ed.) Proceedings of Applications on Renewable Energy in Yemen Workshop. Aden University, Yemen. Al-Shibany, A.R. & Al-Madhajy, M. (2000). Al-Saluk fi Tashkeel Al-fadhah Al-memari fi Al-Yameen. (Behaviour of the Architectural Spaces Composition in the Yemeni Clay Architectural). Proceedings of First Scientific Conference of Clay Architecture on the Threshold of the 21st Century on 10-13th February 2000. Mukalla: Hadhramout University of Science and Technology. Damluji, S.S. (1992). The Valley of Mud Brick Architecture Shibam, Tharim and Wadi Hadhramout. London: Garnet Publishing. Damluji, S.S. (2007). The Architecture of Yemen: From Yafi to Hadhramout. London: Laurence King Publishing Ltd. Lewcock, R. (1986), The Old Walled City of Sana’a. Paris: UNESCO.