Staggered Lightweight Timber Frame Alternative to Traditional Bhutanese Ekra Wall

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00384990" target="_blank" >RIV/68407700:21110/25:00384990 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.researchgate.net/publication/395392065_Lightweight_Timber_Frame_Walls_in_Context_of_Bhutan_and_Staggered_Lightweight_Timber_Frame_Alternative_to_Traditional_Bhutanese_Ekra_Wall#fullTextFileContent" target="_blank" >https://www.researchgate.net/publication/395392065_Lightweight_Timber_Frame_Walls_in_Context_of_Bhutan_and_Staggered_Lightweight_Timber_Frame_Alternative_to_Traditional_Bhutanese_Ekra_Wall#fullTextFileContent</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Staggered Lightweight Timber Frame Alternative to Traditional Bhutanese Ekra Wall

Popis výsledku v původním jazyce

The staggered timber frame ekra wall system is a modern adaptation of a traditional Bhutanese wall construction method. In a typical ekra wall, a heavy post and beam timber frame is infilled with a bamboo lattice and coated with mud plaster. While culturally significant, this method often lacks sufficient seismic resilience and thermal insulation. The improved system introduces staggered vertical timber studs, which alternate on the interior and exterior faces of the wall. This configuration reduces thermal bridging and improves insulation performance. Instead of a bamboo infill woven parallel with the load-bearing timber frame, the system uses diagonally woven split bamboo, which provides additional in-plane bracing and structural stability without altering the traditional appearance of the frame. Infill materials such as mud or hempcrete plaster are applied to both sides of the bamboo lattice, increasing thermal mass and airtightness and thermal insulation properties. The frame itself is designed to resist vertical and lateral loads, with mostly nail joinery for ease of prefabrication and on-site assembly. This hybrid solution maintains the cultural identity of traditional ekra construction with exposed timber elements while addressing modern requirements for seismic performance, energy efficiency, and material optimization. Two prototype houses are currently under construction using this method. The load-bearing timber frame consist of columns/studs of 50x100 mm in cross-section, top and bottom plate of 200x50 mm, trimmers at both sides of the window opening of 200x50 mm and decorative horizontals of 50x50 mm in cross-section from the exterior side of the wall. Total width of the wall structure is 200 mm, studs are placed 50 mm of the wall axis on centre alternative on both sides. Diagonally woven bamboo strips are between studs on the centre of the wall with 100 mm thick layer of hempcrete casted also on the centre of the wall.

Název v anglickém jazyce

Staggered Lightweight Timber Frame Alternative to Traditional Bhutanese Ekra Wall

Popis výsledku anglicky

The staggered timber frame ekra wall system is a modern adaptation of a traditional Bhutanese wall construction method. In a typical ekra wall, a heavy post and beam timber frame is infilled with a bamboo lattice and coated with mud plaster. While culturally significant, this method often lacks sufficient seismic resilience and thermal insulation. The improved system introduces staggered vertical timber studs, which alternate on the interior and exterior faces of the wall. This configuration reduces thermal bridging and improves insulation performance. Instead of a bamboo infill woven parallel with the load-bearing timber frame, the system uses diagonally woven split bamboo, which provides additional in-plane bracing and structural stability without altering the traditional appearance of the frame. Infill materials such as mud or hempcrete plaster are applied to both sides of the bamboo lattice, increasing thermal mass and airtightness and thermal insulation properties. The frame itself is designed to resist vertical and lateral loads, with mostly nail joinery for ease of prefabrication and on-site assembly. This hybrid solution maintains the cultural identity of traditional ekra construction with exposed timber elements while addressing modern requirements for seismic performance, energy efficiency, and material optimization. Two prototype houses are currently under construction using this method. The load-bearing timber frame consist of columns/studs of 50x100 mm in cross-section, top and bottom plate of 200x50 mm, trimmers at both sides of the window opening of 200x50 mm and decorative horizontals of 50x50 mm in cross-section from the exterior side of the wall. Total width of the wall structure is 200 mm, studs are placed 50 mm of the wall axis on centre alternative on both sides. Diagonally woven bamboo strips are between studs on the centre of the wall with 100 mm thick layer of hempcrete casted also on the centre of the wall.

Druh

G_funk - Funkční vzorek

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Interní identifikační kód produktu

2025_Alternative ekra wall_v1

Číselná identifikace

D1.1_Paro_Hemp_Prorotype

Technické parametry

The sample is used by the user of the prototype building Timber used = blue pine Wall test sample size = 5275 x 2440 mm (length x height) Stud size = 50 x 100 x 2340 mm (width x height x length) Stud spacing = 440 mm on axis (average) Top and bottom plate size = 200 x 50 x 5275 (width x height x length) Average volume of installed timber per 1 m length of wall = 0.3719 m3

Ekonomické parametry

Average price of timber per 1 m length of wall = 53.3 USD (25% less than traditional bhutanese timber frame)

Kategorie aplik. výsledku dle nákladů

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IČO vlastníka výsledku

68407700

Název vlastníka

České vysoké učení technické v Praze / FSv / katedra konstrukcí pozemních staveb

Stát vlastníka

CZ - Česká republika

Druh možnosti využití

V - Výsledek je využíván vlastníkem

Požadavek na licenční poplatek

Z - Poskytovatel licence na výsledek nepožaduje v některých případech licenční poplatek

Adresa www stránky s výsledkem

https://www.researchgate.net/publication/395392065_Lightweight_Timber_Frame_Walls_in_Context_of_Bhutan_and_Staggered_Lightweight_Timber_Frame_Alternative_to_Traditional_Bhutanese_Ekra_Wall#fullTextFileContent