Mario Kleff

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Mario Kleff (b. Nov 21, 1967, Germany) is an architect holding a registered trademark in architectural design in Thailand (No. 231100524, Jan 6, 2023).

His credo is “Structure is Design.” Mario Kleff, born November 21, 1967, in Boppard, Germany, is an architect*, vehicle designer, entrepreneur, and creative professional based in Pattaya, Thailand. He founded Wandeegroup Asia Co., Ltd. and established the MK / Mario Kleff name as a personal and professional brand. His documented body of work extends across architecture, structural and design development, custom motorcycles and vehicles, art direction, and project development. Kleff is married to Nittaya Wongsin, and they have one child, Jiang Li Wongsin (Ming Ming). In Thailand, Kleff has also cared for two leopards, Fasai and Typhoon. In Germany, his documented creative activities included the replication of pages from the Book of Kells and work as an art director. Project Attribution

The projects, designs, drawings, structures, vehicles, publications, and other works documented in this archive are attributed to Mario Kleff on the basis of available project records, agreements, drawings, publications, correspondence, and related documentation. His work was carried out through or in collaboration with Mario Kleff Architects Co., Ltd., Wandeegroup (Thailand) Co., Ltd., and Wandee Real Estate & Services Co., Ltd. These companies provided legal, contractual, commercial, development, or professional frameworks for particular projects. Their involvement does not, in itself, supersede the individual attribution of design authorship or design leadership to Mario Kleff, where such attribution is supported by the underlying project documentation. Depending on the individual project, Mario Kleff is identified in the relevant documentation as designer, architect, engineer, project developer, or head of design development. These descriptions identify his documented role and contribution to the respective work and are not intended to imply statutory professional licensing. Professional Licensing

Mario Kleff is currently not licensed as a professional architect or professional engineer in Thailand. Where Thai law requires regulated architectural or engineering acts, including statutory submissions, certifications, approvals, or endorsements, such acts must be performed or endorsed by appropriately licensed professionals. The absence of a Thai professional license does not, by itself, determine questions of creative authorship, design contribution, conceptual design, project development, or historical attribution. This archive distinguishes between individual creative and design attribution and the statutory authority required to perform regulated professional acts in Thailand. Purpose of the Archive

The Mario Kleff Facebook archive is maintained as a historical and professional record of projects, designs, activities, and works associated with Mario Kleff. Attribution is based on the documentation available to the archive and is intended to identify the individual and organizational contributions associated with each documented work. Nothing in this archive is intended to misrepresent the legal status, professional licensing, contractual responsibility, or statutory role of Mario Kleff, any company, or any other professional involved in a particular project.

19/09/2026

Did You Know About Post-Tensioned Combined Footings?

In 2022, Mario Kleff and Dr. Songkiat Matupayont developed a post-tensioned combined footing (PT combined footing) system for a residential building in Thailand. The foundation configuration consists of two post-tensioned concrete combined footings, with each footing supporting two building columns and their associated post-tensioned long-span structural system.

The PT combined footings are supported by drilled deep piles. Each footing distributes the loads from its two column load points through the post-tensioned concrete footing and into its respective pile group, transferring the structural reactions into the deeper supporting strata.

Above the two PT combined footings, a long-span post-tensioned ground-floor slab is constructed together with columns supporting long-span post-tensioned concrete girders. The two PT combined footings therefore form the foundation elements of an integrated post-tensioned structural system, supporting multiple column load points while transferring the resulting reactions to the deep-pile foundations.

https://mario-kleff.com/sun-diego-resort-pattaya

18/09/2026

Did you know that the use of cellular beams in Thailand was being developed as early as 2007–2008?

The story goes back to the end of 2007 and the beginning of 2008, when conceptual ideas emerged for integrating cellular beams into residential projects in Pattaya.

Two early projects were developed: Club Royal, a cluster condominium project, and W-Tower (Wongamat Tower), a high-rise building. Both projects received EIA approval and construction permits, although neither was ultimately built with the proposed cellular beam structural system.

Club Royal was first on the drawing board; W-Tower was intended to proceed first. On 30 June 2008, the architectural agreement was signed, and the design work began. The concept incorporated cellular beams and cellular beam columns into the structural system, together with a 13-meter-high lobby, a large seawater aquarium, and a glass elevator passing vertically through the structure.

The W-Tower design was subsequently submitted for EIA approval and received a construction permit.

The Club Royal concept continued shortly after the W-Tower architectural agreement. Its first submitted design incorporated long-span cellular beam structural members, with advice from Somsak Khumplew.

Meanwhile, in 2008, Mario Kleff designed Park Royal 2, integrating a steel frame, cellular beams, and long-span post-tensioned concrete decking. The structure was completed in 2010 and finished in 2011.

These projects document an early period in which cellular beam technology was being explored and incorporated into building design in Thailand, before it became more familiar in the local construction industry.

15/09/2026

History and Documentation of Cellular Beams in Thailand
International Origin and Technology

Cellular-beam technology is not a Thai invention. The modern cellular-beam manufacturing process associated with Westok traces to a UK patent application with a priority date of 12 January 1988, originally filed by Wescol Structures Ltd. and naming Peter Allan Walker as inventor.

ASD/Westok subsequently developed Cellbeam software for the analysis and design of cellular beams. The software was developed for structural design procedures, including British Standards and, subsequently, Eurocodes.

Cellular Beams in Thailand—2008
Early design concepts were developed by Mario Kleff in late 2007.

The documented development of cellular-beam applications in Pattaya dates to 2008.

In that year, Wandeegroup and Mario Kleff obtained access to Cellbeam software for the development and structural analysis of cellular-beam applications in Thailand. The work involved the integration of cellular steel beams with conventional and post-tensioned concrete structural systems.

Project documentation identifies Mario Kleff, structural engineer Songkiat Matupayont, Somsak Khumplew, and Prapat Boonlualoah in connection with the development, together with participating companies including Siam Yamato Steel (SYS), B.S.Y. Construction, and PBL Group.

The objective was to apply cellular steel beams to long-span structural systems while maintaining the required structural capacity and providing greater flexibility for architectural planning and building services.

Park Royal 2 was the first building in Thailand identified in the project record as utilizing a structural system combining steel frames, cellular beams, and prestressed concrete slabs.

Structural Verification — December 2008

Chagapon Tipsuwan, of Stream Rice Co., Ltd., was involved in calculations examining the feasibility of using cellular beams in conjunction with a concrete deck in December 2008.

The resulting beam design was not sufficient for the applied loading. The structural calculation report identifies deficiencies associated with longitudinal shear and web-post buckling.

Source: Original structural calculation report from Stream Rice Co., Ltd.
https://wandeegroup.com/pdf/cellular_beam_value.pdf

Songkiat Matupayont, together with Mario Kleff, subsequently provided the structural solution that addressed these deficiencies and made the beam design workable.

This distinction is important: the calculation of a proposed beam and the successful structural solution are separate stages of the engineering process.

Fabrication and the 2009 Park Royal 2 Construction

The available project record distinguishes the structural engineering work from the later question of fabrication.

Park Royal 2 in Pattaya was designed in 2008 and constructed between 2009 and 2010, with interior completion in 2011. The project incorporated cellular steel beams within an integrated long-span structural system.

Contemporary documentation of the project was published by Der Farang and Real Estate Magazine Thailand (REm).

These records establish that cellular-beam construction was taking place in Thailand by 2009, predating the later development of dedicated cellular-beam design software and fabrication services by other Thai steel companies.

Cellular Beam Engineering Research in Thailand — 2012

By 2012, cellular beams were also the subject of dedicated structural-engineering research in Thailand.

At the 10th International PSU Engineering Conference, held on 14–15 May 2012, Pattamad Panedpojaman presented “Buckling analysis for web post of cellular beams.” The paper examined cellular-beam geometry and structural behavior, including opening diameter and spacing, web-post flexure, and web-post buckling.

The paper describes the cellular-beam manufacturing process as cutting a rolled steel section in a half-circular pattern and re-welding the two parts, producing the characteristic deeper section with regularly spaced circular openings. It also identifies web-post behavior as a critical component of cellular-beam design.

This provides independent evidence that cellular-beam structural engineering was being formally studied and presented in Thailand by 2012.

The research continued into the following years. In 2013, Pattamad Panedpojaman and Thaksin Thepchatri published “Finite Element Investigation on Deflection of Cellular Beams with Various Configurations” in the International Journal of Steel Structures, Vol. 13, No. 3, pp. 487–494. The manuscript had been submitted in January 2012, indicating that the research was already underway at that time.

Source: Pattamad Panedpojaman & Thaksin Thepchatri, “Finite Element Investigation on Deflection of Cellular Beams with Various Configurations,” International Journal of Steel Structures, Vol. 13, No. 3, pp. 487–494, October 2013.
https://www.researchgate.net/publication/271662319_Finite_element_investigation_on_deflection_of_cellular_beams_with_various_configurations

In 2014, Pattamad Panedpojaman, Thaksin Thepchatri, and Suchart Limkatanyu published “Novel design equations for shear strength of local web-post buckling in cellular beams” in Thin-Walled Structures, Vol. 76, pp. 92–104.
https://www.sciencedirect.com/science/article/abs/pii/S0263823113002929

These publications establish a documented Thai research trajectory in cellular-beam structural behavior from at least 2012 onward, including deflection, web-post buckling, and shear strength.

Vibhavadi Hospital Claim

The Vibhavadi Hospital project, dated approximately 2010, was presented on the Stream Rice website in 2010 as a project involving Cellular Beam (Thailand).
Source: https://web.archive.org/web/20100728232543/http://www.streamrice.com/beam.php

In 2012, Chagapon Tipsuwan stated that cellular beams were first used in Thailand on the Vibhavadi Hospital parking lot project.

That statement conflicts with the earlier documented chronology.

Construction of Park Royal 2 in Pattaya had already incorporated cellular beams during 2009–2010, as documented by contemporary project material. Consequently, the 2012 statement that Vibhavadi Hospital represented the first use of cellular beams in Thailand is inconsistent with the available earlier documentation.

The contemporary Park Royal 2 documentation therefore predates the Vibhavadi Hospital claim.

Siam Yamato Steel—Later Development

Siam Yamato Steel (SYS) represents a later stage in the development of cellular-beam capability in Thailand.

In the mid-2010s, SYS developed its own cellular-beam design software and calculation methodology. This demonstrates the development of a dedicated engineering capability for cellular-beam design.

By the end of the 2010s, SYS had expanded this capability into cellular-beam fabrication, with documented factory cutting and welding services.

This chronology is significant. SYS's later development of dedicated cellular-beam design and fabrication capability should not be confused with the earlier introduction, engineering development, and documented construction of cellular beams in Thailand beginning in 2008–2009.

Chronological Summary and Documented Development

1988
UK patent associated with the modern Westok cellular-beam manufacturing process.

1990s
ASD/Westok develops Cellbeam software for cellular-beam analysis and design.

2008
Wandeegroup and Mario Kleff obtain access to Cellbeam for cellular-beam development and analysis in Thailand. Kleff designed the Park Royal 2 development.

Dec. 2008
Chagapon Tipsuwan performs calculations concerning cellular beams and concrete decking; the proposed beam design was found inadequate.

2008–2009
Structural solution developed by Songkiat Matupayont together with Mario Kleff.

2009
Park Royal 2 construction documents cellular-beam application in Pattaya.

2010
Vibhavadi Hospital project presented by Stream Rice / Cellular Beam (Thailand). Mario Kleff received recognition for his pioneer work on cellular beam structures, including Park Royal 2.
https://mario-kleff.com/pdf/mario-kleff-recommendation-songkiat.pdf

2012
Pattamad Panedpojaman presents research on web-post buckling of cellular beams at the 10th International PSU Engineering Conference.

2013
Panedpojaman & Thepchatri publish research on deflection of cellular beams.

2014
Panedpojaman, Thepchatri & Limkatanyu publish research on shear strength and local web-post buckling.

Mid-2010s
SYS develops cellular-beam design software and calculation methodology.

End of the 2010s
SYS expands into documented cellular-beam fabrication, including factory cutting and welding

(Figure: Park Royal 2 with steel frame, cellular beams, and post-tensioned concrete slabs in 2010)

13/09/2026

Attribution for Major Construction Projects by Mario Kleff

From 2009 to 2026, Mario Kleff’s work on construction projects involving advanced engineering techniques and sophisticated structural solutions has been carried out in cooperation with specialist engineering and construction companies, including Wandeegroup Asia, B.S.Y. Construction PCL, PBL Group, W-Balance, and Span Systems International.

Complex and technically demanding structures require a formidable team of technical advisers working together to develop, review, and implement the required solutions.

Special thanks to:

Songkiat Matupayont—Engineering Adviser
Prapat Boonlualoah—Engineering Adviser
Sadudee Boonlualoah—Engineering Adviser

Their engineering knowledge, technical review, and specialist expertise were an important part of the development and ex*****on of several of these advanced structural solutions.

Without a formidable team, professional projects cannot be realized.

12/09/2026

Historical Milestone of Cellular Beam in Thailand

In 2008, Wandeegroup, together with Mario Kleff, developed the design for the first documented building in Thailand combining a steel-frame structure, cellular beams, and post-tensioned concrete: Park Royal 2 in Pattaya.

In 2009, Siam Yamato Steel (SYS) manufactured the first documented custom 900 mm-deep H-section members in Thailand for Park Royal 2.

Archived evidence for the project, including historical documentation and photographs, is available here:

https://wandeegroup.com/cellular-beam

In 2007–2009, Wandeegroup Thailand, with lead designer Mario Kleff, developed cellular beam applications for several projects in Thailand. The design concept for Club Royal incorporated a cellular beam composite system to achieve long structural spans. In 2008, Wandeegroup also developed the cellular beam design for W-Tower (Wongamat Tower). During the same period, Wandeegroup developed the cellular beam design for Park Royal 2, which subsequently proceeded to physical fabrication and construction in 2009. These projects provide documented evidence of the development and application of cellular beam technology in Thailand during 2007–2009.

In early 2008, Wandeegroup’s research concluded that the fabrication of cellular beams was not yet established in Thailand. Mario Kleff subsequently contacted Westok UK to discuss the possibility of importing cellular beams. For cost reasons, however, Westok instead supplied Wandeegroup with Cellbeam software and relevant technical information to facilitate the fabrication of cellular beams in Thailand. The developer, Heights Holdings Co., Ltd., subsequently decided not to proceed with the cellular beam designs for Club Royal and W-Tower (Wongamat Tower).

Later in 2008, Wandeegroup contacted Stream Rice Co., Ltd. and supplied the information and Cellbeam software received from Westok to investigate the use of cellular beams with a concrete deck for Park Royal 2. The structural calculation indicated that the proposed cellular beam was insufficient for the applied loads. Mario Kleff subsequently consulted Thai engineer and professor Somsak Khumplew regarding the structural solution.

Chagapon Tipsuwan of Stream Rice then approached Nittaya Wongsin of Wandeegroup seeking financial support to establish a machine for cutting steel beams for cellular beam production. Wongsin declined the request and subsequently contacted Somchai Jittawisutthiwong of B.S.Y. Construction instead.

By 2009, Stream Rice Co., Ltd. had established a website presenting detailed information on cellular beam technology. The website, however, reproduced technical text, images, and drawings originating from Westok UK while displaying the copyright notice “© Copyright 2008 all right reserved Stremrice Co.,Ltd.” The website identified both Stream Rice Co., Ltd. and Cellular Beam (Thailand) Co., Ltd. Cellular Beam (Thailand) Co., Ltd., however, was officially registered on 6 March 2009.

The earliest documented project reference identified for Stream Rice Co., Ltd. or Cellular Beam (Thailand) is the parking lot at Vibhavadi Hospital, 51/3 Ngamwongwan Road, Chatuchak, Bangkok.

Archived evidence of the website is available here:

https://web.archive.org/web/20100728232543/http://www.streamrice.com/beam.php

In 2009, construction of Park Royal 2 commenced based on the cellular beam design developed in 2008. Songkiat Matupayont became the adviser on the project, while PBL Group carried out the post-tensioning work. Siam Yamato Steel and B.S.Y. functioned as fabricators. The physical fabrication and construction of the cellular beam structure therefore date to 2009, while photographs made at a later date document the already-constructed structure.

Park Royal 2 therefore represents an important historical milestone in Thai construction and is the earliest documented cellular beam project with a steel frame identified in the available historical record, with physical fabrication and construction documented from 2009.

Historical confirmation

The historical record is independently reinforced by contemporary sources from the period. In its October 2009 issue, Real Estate Magazine Thailand (REm) described Park Royal 2 as “First with cellular beams” and stated that “for the first time in Thailand cellular beams will be used in a condominium construction.” The article also reported that construction work on Park Royal 2 had already begun.

https://web.archive.org/web/20100415180909/http://www.realestatemagazinethailand.com/2009_October/parkyoya.html

This contemporary reporting is subsequently corroborated by an official letter dated 10 September 2010 from Pichet Uthaiwattananonta, Director of the Construction Department, Pattaya City Hall. The letter recognizes Mario Kleff's work in the introduction of innovative architectural solutions, specifically including the use of cellular-beam design in residential projects, and states unequivocally that “Park Royal II was the first to be built.” The document is an official Thai-language letter with a certified English translation.

10/09/2026

“Architecture needs a place for the name and a space without it.”
— Mario Kleff

Mario Kleff was photographed in March 2019, meeting in northern Thailand about rehabilitation and elderly care design.

09/09/2026

Mario Kleff in an interview with Alexander Chetchikov, President of the World Luxury Chamber of Commerce

May, 2026

Alexander Chetchikov asks how Mario Kleff approaches complex resort architecture; Kleff explains that architecture should emerge from the integration of structure, engineering, planning, environment, construction, and long-term performance. Their conversation focuses on architectural responsibility, structural thinking, the relationship between private and collective space, engineering, site and budget constraints, sustainability, integrated design and construction, and the future of luxury resort architecture.

“What you see is a consequence of how the building stands.”
— Mario Kleff

Interview: https://luxurylifestyleawards.com/experience/mario-kleff-interview-resort-architecture

09/09/2026

Mario Kleff — South Beach, Pattaya

South Beach Boutique Chic บนเขาพระตำหนัก พัทยา ออกแบบโดย Mario Kleff ในปี 2008 และก่อสร้างแล้วเสร็จในปี 2012 โครงการสูง 7 ชั้น จำนวน 56 ยูนิต พัฒนาโดย Beach Properties โดดเด่นด้วยแนวทาง Modern Bauhaus ที่เน้นรูปทรงเรขาคณิต เส้นสายสะอาด และความเรียบง่ายของโครงสร้าง

South Beach Boutique Chic, on Pratumnak Hill, Pattaya, was designed by Mario Kleff in 2008 and completed in 2012. The seven-storey, 56-unit development by Beach Properties is characterised by a Modern Bauhaus approach, defined by geometric forms, clean lines and structural simplicity.

South Beach ได้รับการยอมรับในงาน Thailand Property Awards 2012 ซึ่งในปีนั้น Beach Properties ได้รับรางวัลสองรางวัล โดยบันทึกร่วมสมัยของ Inspire Pattaya ระบุ South Beach ไว้ในผลงานของ Beach Properties ที่ได้รับรางวัลในปีดังกล่าว. South Beach was subsequently recognised at the 2012 Thailand Property Awards, where Beach Properties received two awards. The contemporary Inspire Pattaya record documents South Beach within the company's award-winning development portfolio.

Source: CASA Pattaya https://casapattaya.com/th/project/south-beach-boutique-chic
Inspire Pattaya https://web.archive.org/web/20210525062128/https://inspirepattaya.com/lifestyle/beach-properties-double-award-winners-thailand-property-awards-2012/

08/09/2026

Cellbeam and Cellular Beam Design in Thailand

Documentary records establish the use of Cellbeam in connection with Mario Kleff's work on the Club Royal condominium project in Pattaya in 2008, including the consideration of cellular beams in combination with concrete and vibration behavior using a simplified analysis approach associated with SCI P354.

The Cellbeam software and accompanying calculation documentation received by Wandeegroup from Westok form part of the documentary record of cellular-beam design and calculation in Thailand during this period. Wandeegroup subsequently provided the software and calculation documentation to the Construction Department of Pattaya City Hall and a further set to Chagapon Tipsuwan of Stream Rice Co., Ltd., for calculations and assessment of the potential use of cellular beams in combination with concrete.

Somsak Khumplew supported Kleff's proposal to utilize a long-span cellular beam.

The cellular-beam work documented at Club Royal was followed by further development and application of the technology in Thailand through the Park Royal 2 project.

Park Royal 2 is the earliest documented multistory residential building identified in this record to combine a steel frame, cellular beams, and post-tensioned concrete.

Club Royal, in its original proposed form, was never built.

08/09/2026

STRUCTURAL EXPRESSION IS MARIO KLEFF’S ARCHITECTURAL STYLE

Mario Kleff does not apply structure to architecture. He makes architecture out of structure.

The load path, the span, the mass, the material, and the foundation are not technical considerations added to the design—they are the design itself.

His signature residences are characterized by massive concrete and steel members, heavily reinforced high-performance concrete, exceptional spans, and deep foundations engineered to carry them.

ที่อยู่

371/2 Chaiyapruek, Bang Lamung District
Pattaya
20150

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https://wandeegroup.com/mario-kleff, https://mario-kleff.com/, https://maps.app.goo.gl/yKYK4ZoWxHN3vFp87, https://luxury

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เป็นคนแรกที่รู้ข่าว: เราจะส่งอีเมลแจ้งเมื่อ Mario Kleff โพสต์ข่าวสารและโปรโมชั่น อีเมลของคุณจะไม่ถูกนำไปใช้เพื่อวัตถุประสงค์อื่น และคุณสามารถยกเลิกการรับข่าวสารได้ทุกเมื่อ

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