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In the present paper, the Rayleigh wave at a stress free thermally insualted surface of a generalized porothermoelastic solid half-space is considered. The governing equations of generalized porothermoelastcity are solved for general surface wave solution. The particular solutions satisfying the required radiation conditions are obtained. These solutions are applied to boundary conditions at stress free thermally insulated surface. In order to satisfy the relavant boundary conditions, a secular equation for wave speed of Rayleigh wave is obatined. Numerical simulations are done using an experimental data given by Yew and Jogi (1976) [J. Acoust. Soc. Am. 60, 2–8]. The wave speed is computed to observe the effects of frequency, porosity, coefficients of thermal expansion and thermoelastic coupling coefficients.