My basement's insides are completely unfinished. It has bare brick walls and bare concrete beams-vaults as the ceiling. I though of coating the walls and the ceiling with 2 inch thick plaster with the objective being that the house's ground floor won't be so cold in the winter. I thought of doing it myself with plaster since I do not have the budget for fibers, panels, gels, foams or any other insulation.
Can I buy a few sacks of plaster, mix it with water, apply a 2 inch coating and get a reasonable, yet inexpensive, insulation ? Would plaster make the ground floor less cold or would it be a complete waste of my time ?