Not all walls are created equal. The Gypsum Association defines 5 levels of finish. Most DIYers stop at Level 3, but should you?
Level 3: "Standard Texture Ready"
Tape embedded + one coat of mud over screws and joints. This is acceptable if you plan to apply a **heavy texture** (knockdown or popcorn).
Level 4: "Standard Smooth"
Tape + two coats. Sanded smooth. This is the standard for flat paints or light textures in residential homes.
Level 5: "The Mirror Finish"
Tape + coats + a **skim coat** over the entire wall surface. Mandatory if you are using high-gloss paint or have harsh lighting (like a long hallway with a window at the end) that shows every ripple.
Count Your Sheets & Mud
Calculate 4x8 vs 4x12 sheets and buckets of compound.
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