Floor patch and skim coat coverage by brand and product

Coverage per bag and thickness range for each floor patch, skim coat and feather-edge product we have checked, taken from the manufacturer's technical data sheet. Open a product to calculate bags for your own floor.

1 calculator
1 brand
Every number from the maker's data sheet

ARDEX ARDEX Feather Finish 10 lb bag · 16.7 sq ft at 1/4 in

Side-by-side comparison

Coverage per bag at the data sheet's reference thickness. Last column: bags to buy for 100 sq ft plus 10% waste at 0.25 in (or the product's default thickness if 0.25 in is outside its range).
Product	Bag	Coverage per bag	Thickness range	Bags for 100 sq ft
ARDEX Feather Finish ARDEX	10 lb (4.5 kg)	16.7 sq ft at 0.25 in (1.6 m²)	0.0625–0.5 in	7 (at 0.25 in)

1 product. Real coverage depends on the tile, the substrate and your technique; each product page explains how its numbers are worked out.

How floor patch coverage works

Patch and skim products are sold as a bag of powder that fills a fixed volume, so the bag count depends on the thickness you trowel on far more than on the size of the room. Every row in the table above is taken from the manufacturer's own data sheet at a stated thickness, and the last column converts that to bags for 100 sq ft plus 10% waste at the reference thickness, so products can be compared on the same basis.

In practice a patch job is rarely one uniform layer. Seams, hollows, trowel ridges and old adhesive usually need more material than the surrounding floor, so measure the patched share of the floor rather than the whole room, or split the job into zones and add the results.

Choosing the thickness to enter

Feather-edge and seam filling: 1/16 inch or less; the bag goes a long way.
Full skim coat over a rough or profiled floor: often quoted at 1/16 to 1/8 inch.
Hollows and deep fills: measure the depth and run the calculator for that zone on its own.

Most patch products cap out around 1/2 inch outside small, well-defined areas. If a whole room needs more than that, a self-leveling underlayment is the cheaper and flatter route; see the self-leveler comparison.

What is not in these calculators

Where a product is also sold as an embossing filler for old sheet vinyl, the mix usually changes (often a resin instead of water) and the yield changes with it. Those figures sit in the FAQ of the individual product page rather than in the bag calculator.

Sources

ARDEX Feather Finish: ARDEX Americas Technical Data Sheet: ARDEX FEATHER FINISH Self-Drying, Cement-Based Finish Underlayment, content updated 2026-09-14, read 2026-10-29