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Reading: Dynamic, Clay, Secondary Walling for Heat Reduction, in Tropical Indoors


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Dynamic, Clay, Secondary Walling for Heat Reduction, in Tropical Indoors


Malthi Rajapaksha ,

University of Moratuwa, LK
About Malthi

Research Assistant, Department of Civil Engineering


Lecturer, Department of Architecture, KDU
B.Arch (Hons.)(Moratuwa), A.I.A(SL), G.A.P(SL)

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P. D. Dharmaratne,

University of Moratuwa, LK
About P. D.

Research Assistant


Int. PEng. (SL), C. Eng., FIE(SL), B.Sc. Eng. (Peradeniya), Meng (Struct.Eng.). PG Dip (Geo.Eng.), PG Dip (Const.Mgt.), MSSE(SL), M Cons E(SL)

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R. U. Halwatura

University of Moratuwa, LK
About R. U.

Professor, Department of Civil Engineering


C. Eng., PhD (UOM), B.Sc. Eng (Hons) (Moratuwa), MSSE(SL), M Cons E(SL)

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Warming ambient climates in hot - warm climates causes a boost of internal air temperature during the daytime, creating uncomfortable thermal circumstances which affect human physical and mental wellbeing. Modifying indoor thermal discomfort into a comfortable condition is promising with thoughtful material usage, architectural and engineering interventions that involve ‘passive mode’. The use of layered facade interventions is such a popular passive cooling approach which is proven successful but leftover a few drawbacks in its practical usage. The research involved developing a clay panel to be applied as a secondary skin, which is thin, lightweight, easily removable, and maintainable, evading the hitches and accelerating indoor heat absorption, further becoming an ultimate eco-friendly low cost, low embedded energy solution. The research methodology involved identifying the material’s best mix proportion for optimum air permeability, the simplest practical casting method of the panel, identifying optimum configurations on panel’s selfcooling, the best firing temperature, and the firing time, etc. Analysis of the results proves the invention’s capability in heat absorption, thus reducing the indoor air temperature. With the uncomplicated technologies in the invention, it provides opportunity even for layman in production. Further, the invention has possibilities in playing a vital role in socio-cultural aspects in the field of construction as well.
How to Cite: Rajapaksha, M., Dharmaratne, P.D. and Halwatura, R.U., 2022. Dynamic, Clay, Secondary Walling for Heat Reduction, in Tropical Indoors. Engineer: Journal of the Institution of Engineers, Sri Lanka, 55(2), pp.89–98. DOI:
Published on 22 Sep 2022.
Peer Reviewed


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