水斑、湿痕形成原因一是水分自珍珠花板材表面进入，这种现象并不严重，一般经日光照射后很快便可消失。其二是自背面渗透而至珍珠花板材表面，珍珠花板材背面填有水泥砂浆时，由于水泥中含有1～2％的氢氧化纳(NaOH)，氢氧化钠对水分的吸附性很强，与潮湿空气中的二氧化碳接触后产生苏打，当有水份渗入时，苏打可吸附大量的水，造成背面水泥砂浆终年不干，并随着温湿度的变化，呈现范围不同的水斑湿痕。
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