The mixing proportion of drywall mud tends to be decided by the experience of craftsmen in practice, and it results in the wide property variation. In this study, an experiment was carried out to clarify the influence of the water-mud ratio(W/Md) on the mechanical performance. As a result, the relationship between W/Md and the strength / rigidity showed the strong influence of the W/Md can be only observed when the proportion of sand is small. The equations were proposed to estimate the strength and the elasticity of mud drywall based on these relationships found in the result.
