How Much Drywall Mud Do I Need?
Joint compound (drywall mud) is applied in three coats: the taping coat (heaviest), the second/filling coat, and the finish coat (thinnest). Coverage varies by coat type and application thickness.
As a rule of thumb for standard joint taping: figure 0.6 gallons of compound per 100 sq ft for the taping coat, 0.5 gal/100 sq ft for the second coat, and 0.4 gal/100 sq ft for the finish coat (approximately 1.5 gal/100 sq ft total before waste). Add 10% for waste and learning curve. Always buy a bit extra — running out mid-coat is a headache.
Brand notes: USG Sheetrock and ProForm are the two most common brands for contractors. Lightweight all-purpose compound works for all three coats, or use setting-type (hot mud) for the tape coat in high-moisture areas.
High-Moisture Areas: For bathrooms, kitchens, and basements, use setting-type compound (hot mud) for the taping coat. All-purpose compound can re-wet and fail in humid conditions, causing tape bubbling and joint failure. Rooms with many butt joints, inside corners, or vaulted ceilings may require 20-30% more compound than estimated.