Underlayment material composition and methods of preparing and applying the same

A method of using an underlayment material composition, the method comprising:

• preparing the underlayment material composition having:
• a binder comprising calcium sulphate alpha hemihydrate;
• a filler comprising cork;
• a polymer comprising superplasticizer;
• and
• a retarder comprising modified amino acid;
• mixing the underlayment material composition with a defined amount of water for a defined amount of time to produce an underlayment material composition mix having a defined consistency;
• and
• applying a coat of the underlayment material composition mix on a primer-coated surface.

A method of preparing an underlayment material, the method comprising:

• preparing an underlayment material composition having:
• a binder comprising calcium sulphate alpha hemihydrate;
• a filler comprising cork;
• a polymer comprising superplasticizer;
• and
• a retarder comprising modified amino acid;
• and
• mixing the underlayment material composition with a defined amount of water for a defined amount of time to produce an underlayment material composition mix having a defined consistency.