AC Rating and Use Class: Choosing the Right Laminate

The AC rating measures the surface strength of a laminate floor's wear layer and runs from AC1 to AC6. The use class describes which type of space and traffic level the floor suits, using numbers between 21 and 34. The right floor is the product where both values match your actual usage scenario.

What is the AC rating and what does it measure?

The AC rating is a standardised classification that shows how well the transparent wear layer on top of a laminate floor resists friction, scratching and abrasion.

Laminate is a layered product. At the bottom sits the balancing layer, in the middle the HDF core, above that the decor paper, and on top the corundum reinforced wear layer. The AC value describes the performance of this uppermost layer only. In laboratory testing, rotating abrasive discs run across the surface and the number of revolutions at which the decor begins to break down is recorded. The product is then classified accordingly.

In practice, AC3 is accepted as the minimum threshold for busy domestic use. AC4 is chosen for both heavy residential traffic and moderate commercial areas. AC5 and above are produced for shops, lobbies and corridors where foot traffic is continuous. A high AC value does not mean the board is thicker. Abrasion resistance and thickness are two independent criteria and each has to be assessed separately.

What do the use class numbers tell you?

The use class is an international classification that uses a two digit number to define the type of space and the traffic intensity together.

The first digit indicates the type of space. Classes beginning with 2 refer to residential interiors, while those beginning with 3 refer to commercial areas. The second digit shows intensity. On that basis, 21 means a low traffic bedroom, 22 a moderate traffic living room or child's room, and 23 a busy entrance hall or corridor. On the commercial side, 31 covers low traffic spaces such as meeting rooms, 32 covers offices and boutique shops, 33 covers busy areas such as hotel corridors and schools, and 34 covers very heavy traffic spaces such as airports and large stores.

This classification concerns the whole product, not just the surface. Locking system strength, impact resistance and dimensional stability all play a part in determining the class. Project based manufacturers such as She Parquet usually work with class 32 and 33 products in hotel and office contracts, where the floor has to survive years of constant movement.

The relationship between AC rating and use class

The two measures are not interchangeable: the AC rating defines surface abrasion, while the use class defines how suitable the complete product is for a given space.

The common pairing in the industry is as follows. AC3 mostly corresponds to classes 23 and 31, AC4 to class 32, AC5 to class 33, and AC6 to class 34. This pairing is not absolute, however. If two products share the same AC4 wear layer but one has an 8 mm HDF core and the other a 12 mm high density core, their service life in a commercial setting will differ noticeably.

That is why both values should be read together on the technical data sheet. Making a decision based on the AC value alone increases the chance of problems such as locking edges opening up or the surface developing shallow depressions over time. To compare the technical values of different ranges, the content in the laminate flooring articles section offers a sound starting point.

Determining the right AC rating step by step

Decide whether the floor is residential or commercial and fix the first digit as 2 or 3.
Classify the daily foot traffic of the room as low, moderate or heavy and choose the second digit.
If wheelchairs, service trolleys or office chairs will be used, move up one class.
Confirm the AC value that corresponds to your chosen use class on the technical data sheet.
Treat thickness as a separate criterion and prefer 10 mm or more in commercial areas.
If underfloor heating is present, check the total thermal resistance and the surface temperature limit.
Before the final decision, handle a sample to feel the surface texture and the tightness of the locking profile.

How to choose correctly room by room

The right choice comes from assessing a room's traffic and humidity conditions together, because imposing a single class across an entire home usually produces either unnecessary cost or premature wear.

In low traffic spaces such as bedrooms and studies, AC3 products serve without trouble for many years. In busier zones such as entrance halls, corridors and living rooms, AC4 is the safer choice. In offices, boutique shops, cafes and hotel rooms, products between AC4 and AC5 with use class 32 or 33 are recommended.

Pattern choice also shapes the perception of durability. Wide plank surfaces bring a sense of openness to simple interiors, while herringbone layouts such as Aston Louis Herringbone Laminate Flooring give character to visible areas like entrances and living rooms. For those who prefer a classic line, the Aston Louis Plank Laminate Flooring range is a balanced alternative. Readers who want to go deeper into class selection for commercial work can review Flooring Selection for Hotels and Commercial Spaces: A Guide by Use Class.

Technical values to check beyond the AC rating

The abrasion class on its own is not enough, because thickness, locking system, swelling rate and thermal resistance also determine real world performance.

Common laminate thicknesses range between 8 and 12 mm. As thickness increases, footstep noise decreases and the floor tolerates subfloor imperfections better. For behaviour against moisture, look at the swelling rate in the thickness direction. A low value is an advantage in areas such as kitchens where occasional liquid contact occurs. In underfloor heated installations, the surface temperature should not exceed 27 degrees, and the combined thermal resistance of the board and underlay must stay below the manufacturer's limit.

Subfloor preparation before installation matters just as much. Moisture in a cement based screed should be below roughly 2 per cent, expansion gaps must be left along the walls, and ambient relative humidity is expected to stay between 40 and 60 per cent. To hold that balance through dry winter months, the advice in Does a Humidifier Protect Your Floor? Correct Use in Winter is a useful guide.

Common mistakes and how to protect your class

The most frequent mistake is treating a high AC value as a guarantee of a trouble free floor and therefore neglecting subfloor preparation and maintenance.

The wear layer is designed to handle normal foot traffic, not grit and stone. In a space with no doormat at the entrance, even an AC5 product can develop dull patches and fine scratches. Skipping felt pads under furniture legs, using hard chair castors and washing with plenty of water will quickly consume the advantage the class gives you.

The second common mistake is using a product made for homes in a commercial setting such as an office or cafe. There the problem usually appears not on the surface but at the locking joints. She Parquet plans material selection in residential and hotel projects according to the use class of the space and sets the installation details within that framework. Combining the correct class with correct installation is the most reliable way for a floor to reach its expected service life.

Frequently Asked Questions

Which AC rating is enough at home?

AC3 is sufficient in low traffic rooms such as bedrooms and studies. In busy transit areas such as living rooms, corridors and entrance halls, AC4 should be preferred. If there are pets and children at home, choosing AC4 throughout is the more balanced decision.

Is a floor with a higher AC rating thicker?

No. The AC rating only shows the resistance of the top wear layer and is not directly linked to thickness. An 8 mm product can be AC5 while a 12 mm product can be AC3. For that reason, thickness and AC value should be checked separately on the technical data sheet.

What is the difference between use class 32 and 33?

Class 32 is defined for moderate traffic commercial areas such as offices, meeting rooms and boutique shops. Class 33 covers spaces with continuous traffic such as hotel corridors, schools and stores. If you are unsure about traffic intensity, moving up one class is the safer option.

Does the AC rating change with underfloor heating?

The AC rating does not change with underfloor heating because it measures surface abrasion. What matters with underfloor heating is thermal resistance, and the surface temperature should not exceed 27 degrees. Products approved by the manufacturer for underfloor heating and a suitable underlay are essential.

How do I verify the AC rating on a technical data sheet?

On the product data sheet, the abrasion class appears as an abbreviation such as AC3 or AC4, while the use class appears as a two digit number such as 23 or 32. The same page also lists thickness, swelling rate and underfloor heating suitability. Reading these values together allows a proper comparison.