RCB Academy

How to Choose Flooring — The Specification Guide That Saves You From Replacing It Twice

Flooring is one of the highest-impact decisions in any renovation. It is also one of the most misunderstood. This guide covers the specifications that actually determine whether a floor performs for 5 years or 25: wear layer thickness, subfloor preparation, moisture management, and compatibility with underfloor heating.

Wide plank engineered oak flooring in a contemporary living space

The Enemy: Specifying on Appearance Alone

Flooring retailers sell on visuals. The samples look identical. The lifestyle photography is identical. The pricing is often similar. What the display does not show you is the wear layer thickness, the core material, the subfloor moisture requirements, or the installation constraints that determine whether the floor is right for your project.

At RCB, we specify flooring based on the project conditions first: what is the subfloor, is there underfloor heating, what is the foot traffic level, who will occupy the property, and what does the maintenance requirement need to be. Then we look at aesthetics. Here is the framework.

Flooring Types: A Performance Comparison

Engineered Wood

Real wood veneer over plywood or HDF core. Best visual outcome in living spaces. Suitable for underfloor heating when correctly rated. Not fully waterproof — avoid in bathrooms. Specify minimum 3mm wear layer for residential use — allows at least one sanding and refinish. 20-25 year lifespan with proper care.

LVT (Luxury Vinyl Tile/Plank)

Fully waterproof, extremely durable, comfortable underfoot, wide visual range. Best all-round specification for kitchens, bathrooms, and rental properties. The specification choice depends entirely on wear layer thickness — see the section below. Compatible with underfloor heating (check maximum temperature spec per product). 15-20+ year lifespan at 0.55mm wear layer.

Porcelain and Ceramic Tile

Hardest wearing option. Permanently waterproof. No wear layer degradation. Best for bathrooms, kitchens, and outdoor areas. Cold underfoot without underfloor heating. Grout lines require maintenance. Installation is higher cost due to substrate preparation, adhesive, and grout. Excellent 30+ year lifespan when installed correctly.

Laminate

Photographic image layer over HDF core with a thin wear layer. Looks like wood or stone but is neither. Not waterproof despite some marketing claims — the locking joints admit moisture over time. Lower cost but shorter lifespan than engineered wood or LVT. Acceptable in low-traffic bedrooms or budget renovations. Do not specify in kitchens, bathrooms, or high-traffic areas.

Natural Stone (Marble, Limestone, Slate)

Premium visual outcome, genuinely unique. Heavy — structural loading must be checked, particularly on upper floors. Porous and requires sealing. Cold underfoot. High installation cost due to weight and preparation requirements. Excellent lifespan when maintained. Best suited to owner-occupied properties where the maintenance commitment is understood.

LVT Wear Layer: The Specification That Actually Matters

All LVT looks the same on a sample board. It does not perform the same. The wear layer is the transparent protective layer on top — this is what stands between the decorative surface and daily foot traffic.

0.2mm

Budget domestic. Expect 5-7 years.

0.3mm

Light residential use. 7-10 years.

0.55mm

Standard residential spec. 12-15 years.

0.7mm+

Heavy residential / light commercial.

Budget LVT with 0.2mm wear layers is frequently marketed with “heavy duty” or “commercial grade” language in product listings. This language refers to the embossing pattern, not the wear layer. Always check the specification sheet — the wear layer thickness will be stated in mm if the product is worth specifying.

Subfloor Preparation: Why It Matters More Than the Floor

Every flooring manufacturer requires the subfloor to meet specific flatness and moisture tolerances. These are not suggestions — they are conditions that determine whether your warranty is valid and whether the floor performs as specified.

  • LVT: maximum deviation 3mm over 1800mm. Any more and the floor will telegraph unevenness, fail at joins, and show movement.
  • Engineered wood: maximum deviation 3mm over 1800mm, plus moisture content below 12% in timber subfloors and below 75% relative humidity in concrete.
  • Porcelain tile: subfloor must be structurally rigid with zero flex. Any movement in the subfloor will crack tiles and grout joints over time.
  • All floor types over concrete: a damp-proof membrane (DPM) or moisture barrier is required unless the concrete is confirmed as DPC-protected and dry. This applies to the majority of ground-floor concrete substrates in London properties.

RCB Site Survey Checklist

Every RCB flooring project includes a subfloor assessment before the specification is confirmed. We check flatness, moisture readings, structural integrity, and any existing floor coverings that may affect the build height. Flooring costs quoted without a subfloor assessment should always be treated as indicative only.

Underfloor Heating Compatibility

Not all flooring is compatible with underfloor heating, and not all UFH-rated flooring is compatible with all UFH system types. The three key rules:

Check the manufacturer rating

The floor must be explicitly rated for use over UFH by the manufacturer, for the specific UFH system type (wet/screed or electric mat). Generic "UFH compatible" claims without specifying the system type are insufficient.

Maximum surface temperature 27°C

This is a near-universal limit. Exceeding it risks delamination of engineered wood, dimensional movement in LVT, and voiding warranties across all floor types. Your UFH system should be set to achieve a maximum surface temperature, not a maximum water temperature.

Acclimatisation and commissioning

The floor must acclimatise in the room for 48-72 hours before installation. After installation, the UFH must be brought up gradually — starting at 18°C for the first week and increasing by no more than 5°C per day until operating temperature is reached. Switching a cold UFH system to full power immediately after flooring installation is a common cause of failure.

Cost Guide: Supply Only

Budget LVT

£15 – £25 /m²

0.2-0.3mm wear layer. 5-7 year expectation. Suitable for rental refurbishments with short replacement cycles.

Mid-Range LVT / Laminate

£25 – £45 /m²

0.55mm wear layer LVT or quality laminate. 12-15 year expectation. Best value for most residential projects. Brands: Karndean, Amtico, Quick-Step.

Engineered Wood

£35 – £80 /m²

Real wood veneer, 3mm+ wear layer. 20-25 year lifespan. Most commonly specified for living spaces and bedrooms in owner-occupied homes.

Premium / Natural Stone

£60 – £150+ /m²

Large-format porcelain, marble, limestone. 30+ year lifespan. Higher installation cost due to substrate preparation and weight.

Installation (labour, adhesive, underlay, preparation) typically adds £15–£40/m² depending on subfloor condition and product type. Subfloor levelling compound adds further cost where required.

Common Questions

Frequently asked questions.

What is the difference between engineered wood and solid wood flooring?

Solid wood flooring is exactly that: a plank milled from a single piece of timber, typically 18-22mm thick. It can be sanded and refinished multiple times over decades. It is sensitive to humidity changes and will move seasonally, which limits its use in wet areas and over underfloor heating. Engineered wood flooring has a real wood veneer (the wear layer) bonded to a cross-ply plywood or HDF core. This construction makes it more dimensionally stable — it moves less with humidity changes — and generally better suited to underfloor heating and first floor installations. For most residential renovation projects, engineered wood delivers the appearance of solid wood with fewer constraints.

Is LVT (Luxury Vinyl Tile) a real alternative to wood or stone?

Yes, and in some applications it is the superior choice. Modern LVT with a 0.55mm or thicker wear layer is waterproof, extremely durable, warm underfoot, and visually convincing. It outperforms both engineered wood and stone in wet areas (kitchens, bathrooms) and in high-traffic rental properties where replacement cost matters. The limitation is perception — some buyers still associate vinyl with budget. However, a 6mm thick LVT with a 0.55mm wear layer from a quality manufacturer is a genuinely good product. The risk is at the budget end: 2mm thin LVT with a 0.2mm wear layer will not last, and it is sold at the same price points by different retailers.

What wear layer thickness do I need for LVT?

Wear layer thickness is the single most important specification for LVT. It determines how long the floor will look good before it needs replacing. The guidance: 0.2-0.3mm — budget/domestic light use, expect 5-7 years before visible wear. 0.55mm — standard residential specification, 10-15 years with normal care. 0.7mm — heavy residential or light commercial, appropriate for kitchens and hallways with heavy foot traffic. 1.0mm and above — commercial specification. Most RCB residential projects specify 0.55mm minimum. Budget products often carry a 0.2mm wear layer and claim commercial suitability in marketing language — this claim is misleading.

Can I install engineered wood over underfloor heating?

Yes, but it requires the right product and correct installation method. Key requirements: the engineered board must be specifically rated for use over underfloor heating by the manufacturer; the maximum surface temperature of the floor must not exceed 27 degrees Celsius (this is a hard limit that damage and warranty claims depend on); the floor must be allowed to acclimatise for at least 48-72 hours before installation; and the heating system should be commissioned gradually — not switched from cold to full power. Not all engineered woods are UFH-rated. Always confirm with the manufacturer and retain documentation for warranty purposes.

How important is subfloor preparation?

It is the single most important factor in any flooring installation — more important than the floor product itself. A premium floor on a poorly prepared subfloor will creak, dip, fail at joints, and show every imperfection. Subfloor requirements vary by floor type: LVT typically requires a flat surface to within 3mm over 1800mm; engineered wood requires similar tolerance plus moisture content below 12% in the subfloor. Concrete subfloors in London Victorian and Edwardian properties are frequently uneven, moisture-affected, or both. Assuming the subfloor is adequate without checking is the most common and most expensive flooring mistake.

What flooring should I specify for a rental property?

The priorities for rental flooring are: durability under unknown use, ease of replacement or repair of sections, water resistance (particularly in kitchens and bathrooms), and neutral appearance that does not date. LVT at 0.55mm wear layer ticks all of these boxes. It is our most commonly specified floor for rental refurbishments. Engineered wood is acceptable in living rooms and bedrooms but less suitable in kitchens and bathrooms. Avoid: carpet in any kitchen or bathroom, solid wood in any ground-floor rental where flooding risk exists, light-coloured natural stone in family kitchens.

Renovating Your Property?

We specify and install flooring as part of a managed renovation.

RCB Design & Build handles full property renovations across Greater London, including flooring specification, subfloor preparation, and installation. Rated 9.96/10 from 114 verified Checkatrade reviews.

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