How do you install parquet flooring properly?

Quick Answer: Parquet installation in the UK is governed by BS 8201:2011 (Installation of flooring of wood and wood-based panels). Solid parquet blocks (typically 70x230x20mm) must be bonded with an elastic SBR or MS-polymer adhesive over a subfloor at no more than 75% RH, with the timber acclimatised to 8-12% MC. Pattern setting-out (herringbone, chevron, basket weave) must be established from accurate centrelines, not from walls.

Summary

Parquet flooring is the most demanding wood floor a fitter will lay. The traditional UK product is a solid hardwood block 20mm thick, bonded to a screeded subfloor in geometric patterns: herringbone, double herringbone, chevron, brick bond, or basket weave. Modern engineered parquet (10-15mm with a multi-ply backing) has reduced moisture risk but the same setting-out discipline is required.

The labour content is dominated by setting-out, cutting, bonding, and finishing. A herringbone floor takes 3-4 times longer per square metre than a straight-laid plank. The premium charged reflects this, but only if the finished pattern is geometrically accurate to within 1mm across the whole floor.

This guide covers the practical steps from substrate verification through bonding, sanding, and finishing. It assumes the subfloor has been prepared to the standards in BS 8204-1 or BS 8204-7 and meets the moisture limits below. Parquet over UFH is a specialist application — refer to the underfloor heating screed article for screed-side requirements.

Key Facts

• BS 8201:2011 — Installation of flooring of wood and wood-based panels is the governing UK standard
• Solid parquet block — typically 70x230x20mm; common species are oak, walnut, sapele, merbau
• Engineered parquet — typically 70-90mm wide x 350-600mm long x 14mm thick with multi-ply backing
• Moisture content (timber) — 8-12% MC for internal heated rooms, verified with pin-type meter
• Subfloor moisture — 75% RH maximum, 4% CM for sand/cement, 0.5% CM for anhydrite
• Adhesive — SBR-modified bitumen historically; modern installations use MS-polymer, PU, or elastic SBR
• Adhesive coverage — 0.8-1.2 kg/m² with V-notch trowel
• Pattern centrelines — every parquet pattern is set out from the room centre, not the walls
• Herringbone angle — 90° between adjacent blocks; chevron 45° or 60° depending on style
• Expansion gap — 10-15mm perimeter against all walls and fixed structures
• Border options — single line border, multi-line border, or none (with skirting covering expansion)
• Sanding sequence — 40 grit, 60 grit, 80 grit, 100 grit, 120 grit; diagonal first then with the grain
• Final finish — hardwax oil, oil-based polyurethane, or water-based polyurethane to BS EN 14342
• Dust extraction — required during sanding under COSHH; HEPA-rated vacuum mandatory
• Floor finish drying — 24 hours between coats minimum; 7 days to full cure before heavy use
• UFH compatibility — engineered parquet only above 22°C surface temperature; never solid parquet over UFH above 27°C
• Acclimatisation — 7 days minimum in the room of installation, cartons opened, at room conditions
• Tongue and groove — only on engineered parquet; solid block parquet is butt-jointed
• Reclaimed parquet — common in conservation work; check moisture, replace damaged blocks, sand to remove old finish

Quick Reference Table

Detailed Guidance

Subfloor verification before any parquet laying

Parquet is unforgiving of subfloor defects. Before laying:

• Flatness — SR1 (3mm gap under 2m straight edge). Worse than SR1 telegraphs through within months
• Moisture — 75% RH maximum; sand/cement 4% CM; anhydrite 0.5% CM; test minimum 3 points per 100m²
• Cleanliness — no dust, oil, paint splashes, old adhesive residue
• Soundness — tap-test for hollow areas; mark and repair with epoxy injection before laying
• Cracks — fill all cracks above 0.5mm with flexible epoxy
• Priming — most adhesives require a primer specific to the substrate; check manufacturer specification

Anhydrite screeds require additional preparation: sand the surface laitance off with 60-grit floor sander, then prime with anhydrite-specific primer. Failure to remove laitance is the single most common cause of parquet adhesion failure on liquid screed.

Setting out the pattern

Parquet patterns must be set out from the room centre, not from the walls. Walls are rarely square; setting from a wall creates an accumulating error that becomes visible at the opposite end of the room.

Process for herringbone:

1. Measure the room and find the geometric centre
2. Mark a centreline parallel to the longest visible run
3. Mark a second centreline perpendicular to the first
4. Lay a dry-run of blocks (no adhesive) along the centreline for 4-6 blocks in each direction
5. Adjust so that finished cuts at the wall are no smaller than half a block width
6. Mark the final start lines with chalk or laser

For chevron, the centreline is the join line where the angled blocks meet. The 45° or 60° angle is set with a precision protractor or laser. Chevron blocks have factory-mitred ends; herringbone blocks are square-ended.

For basket weave, the unit is a square of 3-4 blocks at 90° to the adjacent unit. Set out the first square at the room centre and work outward in both directions.

Adhesive selection

Adhesive choice determines long-term performance:

SBR-modified bitumen — traditional UK parquet adhesive, hot-applied historically, now usually cold-applied as a black mastic. Strong bond, water-resistant, but messy to work with. Still used on reclaimed parquet restoration where matching the original adhesive is preferred.

MS-polymer adhesives — modern silane-modified polymer, single-component, moisture-curing. Elastic when cured, accommodating timber movement. The standard choice for new parquet installation. Coverage 0.8-1.0 kg/m² with a V4 notched trowel.

Two-part polyurethane — strongest bond, water-resistant, suitable for wet areas, but more expensive and shorter open time (30-40 minutes). Required for parquet over UFH where the adhesive will see thermal cycling.

Acrylic adhesives — only suitable for engineered parquet on dry substrates. Not recommended for solid parquet due to limited elasticity.

Apply adhesive with the trowel held at 60° to the substrate. Work in sections small enough that the adhesive does not skin over before the parquet is bedded (typically 1m² for MS-polymer, larger for slower-setting products).

Laying the blocks

For herringbone:

1. Start at the centre of the room on the established centreline
2. Apply adhesive to 1m² area in front of the centreline
3. Lay the first block with its long edge on the centreline at 45° to the line
4. Lay the second block perpendicular to the first, butt-jointed at the corner
5. Continue laying pairs of blocks, working outward in both directions
6. Roll or hammer each block with a rubber mallet (via timber block) to fully bed into adhesive
7. Wipe adhesive squeeze-out immediately with a damp cloth

Maintain tight joints. The pattern should reveal no daylight between adjacent blocks. If gaps appear, the blocks are not being firmly seated; check trowel notch, adhesive coverage, and bedding pressure.

For chevron, the first row sets the angle for the whole floor. Get this row right or the pattern goes off-square across the room.

Wall cuts and border details

The perimeter cuts are the most visible quality indicator on a parquet floor.

Options:

• No border, blocks cut to walls — simplest, fastest, blocks scribed to wall shape, expansion gap covered by skirting
• Single-line border — a single strip parallel to the wall, typically 70-90mm wide, in matching or contrasting timber
• Multi-line border — two or more strips with contrasting feature line, creating a frame effect
• Mitred corners — borders require 45° mitred internal and external corners; cut with a precision mitre saw

For all options, maintain the 10-15mm expansion gap to the wall, covered by skirting or scotia. Never trap parquet under fitted kitchen units, fireplace hearths, or fixed structures.

Sanding and finishing

Site-finished parquet requires a full sanding sequence after the adhesive has cured (typically 24-48 hours for MS-polymer).

Process:

1. 40-grit drum sand — diagonal to the pattern, removes adhesive squeeze-out and levels the floor
2. 60-grit drum sand — second diagonal, opposite direction to the first
3. 80-grit drum sand — with the longest axis of the pattern
4. Edge sand — perimeter and around obstructions with a 60-80 grit edger
5. Vacuum thoroughly — HEPA-rated vacuum, multiple passes
6. 100-grit rotary or buffer sand — final levelling pass
7. 120-grit rotary or buffer sand — final pre-finish pass
8. Vacuum and tack cloth — surface preparation for finish

Skip a grit at your peril — the next grit cannot remove the scratches left by the previous one. The 40-60-80-100-120 progression takes time but eliminates the swirl marks and sanding scratches that show up under raking light.

Finish options:

• Hardwax oil — natural finish, matte appearance, easy to spot-repair, 3 coats recommended
• Oil-modified polyurethane — amber tone, hard wearing, full cure 7 days, 3 coats
• Water-based polyurethane — clear tone, fastest dry, 3-4 coats for commercial spec
• UV-cured oil/lacquer — factory-applied only on engineered parquet

Apply finish following manufacturer instructions, with full ventilation, away from direct sunlight or heat sources during cure. Keep relative humidity stable for the cure period.

Reclaimed parquet specifics

Reclaimed parquet is increasingly popular for conservation and feature work. Practical considerations:

• Check each block for woodworm or rot before relaying
• Remove old adhesive (typically hot bitumen) by scraping or sanding the underside
• Acclimatise reclaimed blocks for 14-21 days minimum — older timber may have absorbed atmospheric moisture
• Expect 10-15% wastage for damaged or unusable blocks
• Sanding may reveal old finish layers; full sanding to bare timber needed for new finish

Frequently Asked Questions

Can I lay parquet over an existing timber subfloor?

Yes, if the subfloor is sound, flat (SR1), screwed (not nailed) to joists, and moisture-stable. Overlay with 6-9mm WBP plywood screwed at 150mm centres before bonding parquet, to provide a uniform, void-free substrate.

What pattern is most popular for new parquet floors?

Herringbone in oak remains the dominant UK choice for new installations, particularly in period property restoration and high-end residential refurbishment. Chevron is increasingly popular in contemporary interiors. Basket weave and brick bond are less common but distinctive.

How long should parquet acclimatise on site?

7 days minimum for engineered parquet, 14 days for solid parquet, in the room of installation, with the building at normal occupied temperature and humidity. The room should be glazed, plastered, with primary heating commissioned but running steadily.

Can I lay parquet over underfloor heating?

Engineered parquet yes, up to 27°C surface temperature, with a thermally compatible adhesive. Solid parquet not recommended above 22°C surface temperature, and never recommended above 27°C — solid block shrinkage gaps will become unacceptable.

Why is my newly-laid parquet showing gaps between blocks?

Either the timber was over-dry on installation (below 6% MC) and has now equilibrated higher, or the subfloor was too dry and the parquet has shrunk away. Verify timber MC and subfloor RH against manufacturer specification. Small gaps (<1mm) are normal seasonal movement; gaps over 2mm indicate an installation defect.

Regulations & Standards

• BS 8201:2011 — Code of practice for installation of flooring of wood and wood-based panels. Governing UK standard.

• BS 8204-1:2003+A2:2011 — Concrete bases and cementitious levelling screeds for receiving flooring.

• BS 8204-7:2003+A1:2008 — Pumpable self-smoothing screeds for receiving flooring.

• BS EN 14342:2013 — Wood flooring and parquet. Characteristics, evaluation of conformity and marking.

• BS EN 13629:2012 — Wood flooring. Solid pre-assembled hardwood boards.

• BS EN 14761:2006 — Wood flooring. Solid wood parquet.

• Building Regulations Approved Document E — Resistance to passage of sound. Acoustic considerations for parquet in flats.

• Construction Products Regulations 2013 — UKCA/CE marking required under BS EN 14342.

• COSHH 2002 — Wood dust is a recognised carcinogen; HEPA dust extraction mandatory during sanding.

• WEL (Workplace Exposure Limit) — hardwood dust 3 mg/m³ 8-hour TWA per EH40.

• Forest Stewardship Council (FSC) / PEFC — Chain of custody certification for sustainably sourced timber.

• BSI Standards Catalogue — BS 8201:2011 — Governing UK code of practice

• Wood Flooring Federation (WFF) — UK trade body guidance

• HSE — Wood Dust — Workplace exposure and dust extraction requirements

• British Woodworking Federation — Industry technical guidance

• TRADA Technical — Timber research and advisory association

• parquet block — Overview of parquet and herringbone patterns

• hardwood floor sanding — Detailed sanding sequence and equipment

• subfloor preparation guide — Substrate prep for parquet

• floor levelling compounds — Smoothing compound under parquet

• screed types — Screed selection under bonded parquet

• underfloor heating screed — Parquet over UFH considerations