A gypsum product has a first polymeric additive and a second polymeric additive distributed therein, wherein the first polymeric additive is a synthetic polymer and the second polymeric additive is starch.
It has been found that the combination of starch and a synthetic polymer may result in one or more of the following advantages in the manufacture and performance of gypsum products: increased strength; greater ease of manufacturing due to the increased fluidity of stucco slurries containing both additives; and increased resistance to hygroscopic expansion.