The honest answer is that microcement does not have one coverage number. A complete system is built in layers: primer, base coat, decorative finish, and topcoat. Each layer spreads differently, and the substrate decides how conservative the estimate needs to be.
Short answer: for ATRIA PURO, one 20 kg Atriafloor Rasante One kit covers about 108 sq ft for the two-coat base build. One 20 kg SuperTitanium BC bucket covers about 179-215 sq ft for two finish coats. One 5 L Atriapol kit covers about 269-317 sq ft for two topcoat coats. Add a buffer and confirm the system before ordering.
Why a single coverage number is misleading
A lot of coverage guides say something like "one bucket covers 200 square feet." That can be true for one product and false for the next product in the same system. The base coat is not the finish coat. The topcoat is not the primer. A shower is not a dry feature wall.
The right way to estimate microcement is layer by layer. Start with the project area, identify the surface type, choose the correct system, calculate each product from its TDS coverage, add a realistic buffer, then round up to the package size.
| Product | TDS coverage | Practical planning note |
|---|---|---|
| Primerquarz Quartz primer for many mineral or absorbent substrates | 12-16 m2/L per coat | 15 L bucket covers about 1,938-2,584 sq ft for one coat |
| Atriafloor Primer BC Two-component primer used in PURO floor and wet-area systems | 120-150 g/m2 per coat | 5 kg kit covers about 359-449 sq ft for one coat |
| Atriafloor Rasante One Base coat / rasante build layer | 1 kg/m2 per coat; 2 kg/m2 for two coats | 20 kg kit covers about 108 sq ft for the two-coat base build |
| Titanium Single-component polyurethane microcement finish | 0.9-1 m2/kg in two coats | 20 kg bucket covers about 194-215 sq ft for two finish coats |
| SuperTitanium BC Two-component polyurethane microcement finish for floors and wet areas | 1-1.2 kg/m2 in two coats | 20 kg bucket covers about 179-215 sq ft for two finish coats |
| Atriapol Protective polyurethane topcoat | 10-11.8 m2/L per coat | 5 L kit covers about 269-317 sq ft for two topcoat coats |
Those figures are useful, but they are not a complete shopping list by themselves. A PURO floor, wall, or bathroom system may use different primers, reinforcement, finish products, and topcoat decisions depending on the substrate and exposure.
The formula we use
Estimator logic
area x layer consumption x waste buffer ÷ package size = rounded package quantity
The store calculators use this same idea: they convert square feet to square meters, apply the TDS coverage range, add the selected buffer, and round up to the next full bucket or kit.
Example quantities
These are planning examples, not final project specifications. They show why the base coat often drives the number of kits, while the finish and topcoat may round differently.
100 sq ft sample wall or floor
Base: 1 Atriafloor Rasante One kit for two base coats
Finish: 1 Titanium or SuperTitanium BC bucket
Topcoat: 1 Atriapol kit
You will not consume every full package, but this is usually the minimum purchasable unit logic.
250 sq ft floor or larger bathroom area
Base: 3 Atriafloor Rasante One kits with a normal buffer
Finish: 2 SuperTitanium BC buckets for wet-area or floor work
Topcoat: 1-2 Atriapol kits depending on waste buffer and coat count
This is where the product page calculator matters because rounding can change the kit count.
500 sq ft open floor
Base: 6 Atriafloor Rasante One kits for a two-coat base build
Finish: 3 Titanium or SuperTitanium BC buckets in many standard cases
Topcoat: 2 Atriapol kits for two coats with planning buffer
Large projects should be confirmed from actual substrate photos before ordering.
What changes real-world coverage
- •Substrate absorption changes primer and sealer behavior.
- •Rougher or textured surfaces consume more product than smooth prepared surfaces.
- •Edges, corners, niches, stairs, and shower details create more waste than open floor area.
- •A trained applicator usually wastes less product than a first-time installer.
- •Wet areas and high-wear floors may need a more conservative topcoat plan.
A trained installer may be comfortable with a tighter estimate. A first-time applicator, a textured wall, a stair run, or a shower with niches and benches should be more conservative. Returning one extra sealed unit is easier than stopping a project because the final coat ran short.
Floors, walls, and showers need different thinking
Floors usually need the most conservative performance thinking because they handle abrasion, furniture, shoes, and cleaning. Wet areas need system thinking because waterproofing, reinforcement, slope, drains, and cure times matter. Dry feature walls are usually simpler, but still need the right primer and a realistic application buffer.
For showers, do not treat coverage as the only question. Read our guide on using microcement in showers first, because waterproofing and system build matter more than the bucket count.
Floors
Review the floor system before estimating high-wear areas.
Walls
Use wall systems for feature walls and vertical surfaces.
Bathrooms
Plan wet-area work as a complete waterproofing and finish system.
Use the product calculators before you buy
The easiest way to avoid under-ordering is to open the product page, enter the square footage, choose the application mode, and keep the 10 percent buffer turned on unless your installer tells you otherwise.
Start on the PURO microcement store page, then calculate each product you need: primer, rasante, finish coat, and topcoat. For large projects, send us the photos and square footage so we can check the system before you order.
Need help checking quantities?
Send us the room size, surface type, photos, and whether the area is dry, wet, floor, wall, or high traffic. We will help you avoid missing a layer or ordering too tight.
Frequently asked questions
Can I calculate the whole microcement system from one coverage number?
No. Primer, base coat, finish coat, and topcoat each have different TDS coverage. Estimate each layer separately, then round up to the package size.
Which finish should I use for floors or showers?
For floors, high-wear areas, and wet areas, ATRIA usually recommends SuperTitanium BC. For many interior walls, Titanium or Titanium Superfino may be a better fit depending on the finish goal.
Is the calculator exact?
No calculator should be treated as exact. The ATRIA calculators are TDS-based planning tools. Final quantities depend on substrate, prep, texture, coat thickness, and installer technique.
What should I do before ordering for a large project?
Send ATRIA the square footage, photos, substrate type, room use, and whether the surface is wet, vertical, horizontal, or high traffic. Large orders should be specified as a full system.