What is the gross area of walls and ceilings before deducting openings?

The gross area of walls and ceilings before deducting openings refers to the total surface area that would need to be considered for various calculations, such as material costs or insulation requirements, without accounting for any doors, windows, or other openings that would reduce the overall area. This area is crucial for estimators who need to determine how much material will be required for a project.

In this case, the figure of 779.49 square feet is the specific area derived from either measuring or calculating the total surfaces of the walls and ceilings in question. This measurement ideally includes every square foot of the surfaces, capturing the whole area before any deductions for openings.

The other options represent different potential measurements which do not accurately reflect the specifics of the project or may involve estimates not fully accounting for all areas of interest. Therefore, the value of 779.49 square feet stands as the most precise representation of the total gross area before making any adjustments for openings, ensuring that estimators have a comprehensive basis upon which to base their further calculations and decisions.