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<> A 50 lb bag of a cement-based self-leveler such as LevelQuik RS covers 46–48 sq ft at 1/8 inch — a yield of about 0.48–0.50 cubic feet — and coverage…
With these inputs:
| Result | Value |
|---|---|
| Bags of leveler (50 lb) | 7–8 |
| Average depth | 0.25 in |
| Volume with waste | 3.44 cu ft |
| Coverage per bag at this depth | 23–24 sq ft |
| Primer | 1 gal |
Mix and pour continuously — SLU has about a 10-minute working time once mixed.
<> A 50 lb bag of a cement-based self-leveler such as LevelQuik RS covers 46–48 sq ft at 1/8 inch — a yield of about 0.48–0.50 cubic feet — and coverage halves every time depth doubles. The calculator takes the shallowest and deepest points of the pour, averages them (a floor that runs from a featheredge to 1/2 in averages 1/4 in), works out the cubic feet, adds your waste allowance and divides by the bag yield. The lower bag count uses 48 sq ft per bag, the higher one 46. Primer matters: unprimed concrete sucks the water out of SLU and it cracks. One gallon of primer covers about 350 sq ft. Pour the whole floor in one session — SLU self-welds only while wet, and a cold joint becomes a crack line under tile.
Multiply the area by the average depth in inches and divide by 12 for cubic feet, add about 10% for waste, then divide by the bag yield — about 0.48–0.50 cu ft for a 50 lb bag (46–48 sq ft at 1/8 in). 150 sq ft averaging 1/4 in is 3.4 cu ft with waste: 7–8 bags.
About 3 bags at 1/8 in, 5 at 1/4 in and 10 at 1/2 in, allowing 10% for waste, using 46–48 sq ft per 50 lb bag at 1/8 in.
200 sq ft × 0.5 in ÷ 12 = 8.3 cu ft, or 9.2 cu ft with 10% waste. At 0.48–0.50 cu ft per 50 lb bag that is 19–20 bags — buy 20 and mix them back to back, because the whole floor has to be poured in one go.
LevelQuik RS and TechLevel 150 pour from a featheredge up to 1 1/2 inches in a single application; other products differ, and some need pea gravel added for deep fills. Check the bag — exceeding the rated depth causes cracking.
Yes, with the right product: it must be rated for plywood, the floor must be rigid (screw down squeaks first), and you use metal lath or the manufacturer's primer system. Never pour standard SLU straight onto bare plywood.
Most SLUs accept tile in 4–24 hours (check the bag). Moisture-sensitive tile like natural stone may need longer — test with a moisture meter on big pours.
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