The Ceiling-Plaster Manual, Written in Trial and Error

Day forty-four. A professional’s rhythm upstairs in the kitchen, and downstairs, the moment a self-builder lives for: writing the manual you wish you’d been handed.

The tub gets ready for its rubber coat. Gomas won’t bond to raw brick, so the tub’s interior — walls and floor — got a full mortar render first. In the same pass we raised the tub’s floor about 3 cm: partly for drain fall toward the outlet, partly for how the tub will actually feel to sit in. A masonry tub is sculpture you calibrate in centimeters.

The professional at work. Cheolsu-hyung, our tiling expert, began production on the kitchen walls — the zones where cabinetry will hang came first, and by day’s end the outer wall was done: 50% of the kitchen in a single day, every course struck level against the future cabinet line. We supported by boarding the side wall right ahead of his advance. Watching a pro tile after weeks of doing everything ourselves is humbling in a useful way: the speed is the skill.

The manual. And then the day’s real deliverable — after all the ceiling-edge battles, our finalized four rules for plastering hanok ceiling zones:

1. Top-down, always. Finish the upper face first; working bottom-up means cement raining on completed work, and doing everything twice.
2. Peanut-butter consistency. X18 mixed thick and spread generously holds a plane. A wet mix flatters you on application, then drips and ruins the floor and the finish both.
3. Minimal brushing. Mist, then one or two soft strokes. Overworking the brush undoes the smoothness it created.
4. Holes by size. Pinholes: a single reverse-direction brush flick. Real voids: pack with a loaded rubber spatula (a spoon works), then re-brush once.

Trial and error is only expensive if you don’t write down what it bought.