The Detail
How we actually spec the job
materials, methods, situations.
Laminate has moved a long way since the early click-fit days. Modern AC4 and AC5 ranges, with proper underlay and a competent fit, are an honest mid-range hard floor. Here's how to spec it well.
AC ratings, what actually matters
AC3 is light domestic, bedrooms only. AC4 is heavy domestic and light commercial, the right minimum for lounges, halls and stairs. AC5 is heavy commercial, used domestically where children, dogs and grit will test the floor. Spending up to AC4 is almost always worth it; AC5 is a sensible upgrade in halls and hard-use family rooms.
Thickness, 7mm to 12mm
7mm is fine for budget bedroom fits. 8mm is the residential standard. 10–12mm boards with pre-attached underlay feel solid underfoot, mask minor sub-floor imperfections and are typically the right choice in living rooms and open-plan spaces. Thicker boards are not automatically better, the AC rating tells you more about wear life than thickness does.
Underlay, acoustic, DPM, combined
On a timber sub-floor we use 3mm acoustic underlay. Over concrete or screed we use combination underlay with a built-in damp-proof membrane to stop residual moisture migrating into the laminate core. Where the laminate already has integrated underlay, we still add a DPM layer over concrete.
Water-resistant ranges
Several modern laminates use a water-resistant HDF core and tighter joints that handle splashes and short standing water. These are the right pick for kitchens, utility rooms and family bathrooms where you want the laminate look but need real-world water tolerance. For full wet rooms we still recommend LVT.
Residential vs commercial use
For homes we lead with comfort, look and the right AC rating. For offices, salons and light commercial fits we move to AC5 with reinforced joints and confirm the warranty supports the use class. Heavy public-facing commercial is usually better in LVT or commercial sheet vinyl, see our commercial flooring page.