Collection 1 min read

20mm Engineered Oak Flooring

6 engineered oak floors in the range are 20 mm thick, on the catalogue of 20 October 2026: 3 planks and 3 Versailles panels. They carry an oak wear layer of 4 or 6 mm, and all 6 are listed as compatible with underfloor heating.

Floors

Thickness

20 mm

Widths

190 to 800 mm

Samples

£1.99 each

1/ 5

The 6 floors at 20 mm

By format: 3 planks (190 to 220 mm or wider wide) and 3 Versailles panels of 800 x 800 mm. By range: Victorian (2), Avignon (1), Bordeaux (1), Montpellier (1) and Richmond (1). The planks have a 6 mm oak wear layer, the panels 4 mm.

Planks (3)

20 × 240 × 2200 mmRichmond Natural Oak

20 × 190 × 1900 mmVictorian Antique Smoky

20 × 190 × 1900 mmVictorian Antique Dark

Versailles panels (3)

20 × 800 × 800 mmAvignon Oak Versailles Panel

20 × 800 × 800 mmBordeaux Oak Versailles Panel

20 × 800 × 800 mmMontpellier Oak Versailles Panel

Side by side

Product	Construction	Thickness	Wear layer	Width	Finish and surface	Underfloor heating
Avignon Oak Versailles Panel 20 x 800 x 800	Engineered oak	20 mm	4 mm	800 mm	Matt lacquered, brushed	Compatible
Bordeaux Oak Versailles Panel 20 x 800 x 800	Engineered oak	20 mm	4 mm	800 mm	Matt lacquered, brushed	Compatible
Montpellier Oak Versailles Panel 20 x 800 x 800	Engineered oak	20 mm	4 mm	800 mm	Invisible matt lacquered, brushed	Compatible
Victorian Antique Smoky Oak Flooring 20 x 190 x 1900	Engineered oak	20 mm	6 mm	190 mm	Hard wax oil, deep brushed	Compatible
Victorian Antique Dark Oak Flooring 20 x 190 x 1900	Engineered oak	20 mm	6 mm	190 mm	Hard wax oil, deep brushed	Compatible

Shown above, but not in the table until its listing gives one consistent thickness, wear layer and width: Richmond Natural Oak 20 x 240 x 2200.

What 20 mm changes

Two published figures bear on a 20 mm board. BEAMA's underfloor heating guide advises fixing engineered boards of less than 20 mm to additional decking when they go over joists rather than a screed, unless the manufacturer states otherwise; it also describes engineered timber as laid as a floating floor or nailed into battens or joists (both quoted below). These 6 are 20 mm, so that advice for thinner boards does not apply, and each floor's fitting instructions still decide. Thickness also holds heat back: Junckers, a manufacturer, gives 0.12 m²K/W for its own 20.5 mm boards against 0.08 at 14 mm.

More flooring by feature

What the published standards say

Published standards

Each entry is quoted from its source and linked to it. The full set is in the standards reference.

Engineered boards under 20 mm over joists or battens

Unless installed over a screeded slab, engineered boards of less than 20 mm thickness should, according to BEAMA, be supported and fixed to an additional decking material for structural support, unless the manufacturer specifically states otherwise.

board thickness below which extra decking is advised (not over a screed)	20 mm

“Unless installed over a screeded slab, engineered boards of less than 20mm thickness should be supported and fixed to an additional decking material to lend suitable structural support unless specifically stated”

Source: BEAMA Underfloor Heating — Choosing your floor covering to maximise your underfloor heating efficiency (April 2020)

Engineered timber over underfloor heating: floating or nailed

BEAMA, the UK underfloor heating trade association, describes engineered timber as a more stable option than solid timber because it is cross-laminated, so that its moisture content is less critical, and says it can be laid directly over underfloor heating as a floating floor or nailed into battens or joists.

“Engineered timber – A more stable option than solid timber, due to being cross-laminated, its moisture content is less critical. It can be laid directly over the underfloor heating as a ‘floating floor’ or nailed into battens or joists.”

Source: BEAMA Underfloor Heating — Choosing your floor covering to maximise your underfloor heating efficiency (April 2020)

Thermal resistance of wood boards by thickness

Junckers gives the thermal resistance of its wood floorboards as 0.08 m2K/W at 14 mm, 0.09 at 15 mm, 0.12 at 20.5 mm and 0.13 at 22 mm, adds the underlay to the board, and works the example of a 14 mm board on its PolyFoam underlay (0.07) to a total of 0.15 m2K/W.

14 mm floorboards	0.08 m2K/W
15 mm floorboards	0.09 m2K/W
20.5 mm floorboards	0.12 m2K/W
22 mm floorboards	0.13 m2K/W
Junckers PolyFoam underlay	0.07 m2K/W
Junckers Foam underlay	0.04 m2K/W

“22 mm floorboards: 0.13 20.5 mm floorboards: 0.12 15 mm floorboards: 0.09 14 mm floorboards: 0.08 Intermediate layer: Junckers PolyFoam, incl. extra 0.20 mm PE membrane: 0.07 Junckers Foam: 0.04 … Example: 14 mm clip system laid on PolyFoam, the total insulation is: md = 0.08 + 0.07 = 0.15 m² °K/W.”

Source: Junckers — Underfloor Heating, General Information (technical data sheet E 4.0)

BS EN 13489 — multi-layer parquet

BS EN 13489 is the product standard for multi-layer parquet elements, setting out their characteristics, requirements and test methods for internal use as flooring.

“This document specifies the characteristics, requirements and test methods of multi-layer parquet elements for internal use as flooring.”

Source: BS EN 13489:2023 - Wood-flooring and parquet. Multi-layer parquet elements

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Collection 18mm oak flooring Collection Wide plank oak flooring Underfloor heating Engineered wood over underfloor heating

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