Parquet and Block Flooring: Herringbone Layout, Adhesive Types, Sanding & Finishing
Traditional solid parquet blocks (typically 70×230mm or 50×200mm, 20–22mm thick) are laid in a herringbone pattern using a bitumen-based or polyurethane adhesive directly on a clean, dry concrete subfloor. The floor must be sanded progressively (36, 60, 80 grit) and finished with hardwax oil, lacquer, or wood stain. Moisture content of the concrete must be below 75% RH and blocks must acclimatise for minimum 7 days at room temperature before laying.
Summary
Parquet flooring — geometric blocks of solid hardwood laid in interlocking patterns — has been a feature of British homes and public buildings since the Victorian era. The classic herringbone pattern remains the most popular, but basketweave, brick bond, chevron, and Versailles panel designs are all periodically fashionable. Many of the best parquet floors are reclaimed: original 1920s–1970s blocks salvaged from schools, hospitals, and factories, which were routinely lifted and replaced during refurbishment. Reclaimed blocks, once de-nailed and cleaned, can be re-laid and sanded to produce a floor that is difficult to distinguish from new.
The trade skills involved in parquet — precision layout, adhesive selection, sanding without creating a wavy or ridged surface, and applying a durable finish — are distinct from general carpentry. Most successful parquet installers have spent significant time working alongside an experienced fitter before working alone. Sanding is particularly unforgiving: a floor sanded unevenly with the wrong grit or pressure combination can have a rippled surface visible in raking light that is impossible to correct without starting over.
Key Facts
- Block sizes — Traditional: 50×200mm, 70×230mm. Victorian reclaimed: various, often 57×228mm or similar imperial sizes
- Block thickness — Typically 20–22mm for new and reclaimed. Engineered parquet blocks can be thinner (14–16mm)
- Moisture content of wood — Must be 8–12% for site-laid solid wood. Measure with a pin moisture meter
- Concrete moisture — Below 75% RH (test with hygrometer minimum 72 hours)
- Adhesive options — Bitumen mastic (traditional, black, flexible), polyurethane (modern, strong), MS polymer (good adhesion, low VOC)
- Herringbone layout — Establish a true centre line. Set out in a dry run (no adhesive) before committing. Proportion of border tiles planned
- Chevron vs herringbone — Herringbone: blocks at 90° to each other. Chevron: blocks cut at a mitre (typically 45°) to meet at a point
- Sanding sequence — 36 grit (coarse) across the grain first, then 60 grit diagonal, then 80 grit along the grain. Final finish with 100–120 grit
- Drum vs belt vs orbital — Drum sander for main area (fastest material removal). Belt sander for edges. Orbital (random orbit) for final finish pass
- Finish types — Hardwax oil (penetrating, easy repair, lower build), lacquer/polyurethane (surface coat, harder, better wear), stain under hardwax oil
- Hardwax oil coats — Typically 2–3 coats. Allow each coat to cure per manufacturer's instructions (typically 12–24 hours)
- Lacquer coats — 3 coats minimum (seal coat + 2 finish coats). Sand lightly (220 grit) between coats
- Movement gap — 10–15mm at all walls. Cover with matching timber expansion beading pinned to skirting
Quick Reference Table
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Try squote free →| Layout Pattern | Degree of Difficulty | Material Waste | Best For |
|---|---|---|---|
| Herringbone | Intermediate | 8–12% | Traditional rooms, period properties |
| Chevron | High | 15–20% (mitre cuts) | Contemporary, long narrow rooms |
| Brick bond (running) | Easy | 5–8% | Less formal spaces |
| Basketweave | High | 10–15% | Period, formal rooms |
| Versailles panel | Expert | 15–20% | Grand rooms, bespoke |
| Adhesive Type | Flexibility | Moisture Resistance | Open Time | Best For |
|---|---|---|---|---|
| Bitumen mastic | Good | Good | 30–60 min | Traditional parquet, reclaimed blocks |
| 1-part polyurethane | Low | Excellent | 20–40 min | New parquet, stable environment |
| 2-part epoxy | Very low | Excellent | 20 min | Problematic substrates |
| MS polymer | Good | Good | 30 min | Low-VOC requirement |
Detailed Guidance
Subfloor Preparation
Concrete subfloors are the most common substrate for parquet. The concrete must be:
- Sound — no hollow areas, crumbling, or loose material
- Flat — within 3mm per 2m (use a straightedge to check)
- Dry — below 75% RH (critical — wood swells with moisture, causing blocks to peak and lift)
- Clean — free from oil, grease, old adhesive, and paint
Self-levelling compound is the best way to flatten an uneven concrete floor. Allow full cure (minimum 24 hours per 10mm depth) before laying parquet.
Timber subfloors: Install a plywood overlay (minimum 12mm exterior-grade ply, screwed at 150mm centres) to create a rigid, stable base. Solid wood on a bouncy timber subfloor will develop squeaks and movement.
Acclimatisation
Parquet blocks must acclimatise to the room's humidity and temperature for a minimum of 7 days, ideally 14 days for reclaimed blocks. Store in the room with the heating at normal operating temperature. Stack blocks flat with spacers between layers to allow air circulation. This allows the wood to reach its equilibrium moisture content (EMC) in the environment where it will be installed.
Do not lay parquet in rooms where the heating has not been operational for at least 2 weeks.
Setting Out the Herringbone Layout
- Find the centre of the room — snap chalk lines from the midpoint of each wall to give a true centre cross
- Adjust the layout to avoid narrow cuts (less than half a block width) at skirting boards. Shift the starting position slightly if necessary
- Set out a dry run (no adhesive) from the centre line in both directions to check the proportions and border spacing
- Mark the centre working line with a chalk snapper. This is the critical reference line — it must be perfectly straight
For herringbone: The first block in a herringbone layout sits at 45° to the centre line. Lay a block centred on the cross, at 45°. This sets all subsequent blocks.
Border design: Most herringbone floors have a straight-laid border (feature strip) running around the room, separating the herringbone field from the skirting. Typically one or two block widths wide. The border must be parallel to the walls. Plan the border width as part of the layout before starting.
Adhesive Application and Laying
For bitumen mastic: use a flat-edge trowel to spread adhesive approximately 2mm thick. Mastic has a long open time (30–60 minutes) — do not rush.
For polyurethane: use a V-notch trowel (typically 3×3mm or as specified). Work in smaller areas as open time is shorter.
Laying sequence: Start at the centre line. Lay the first row of herringbone blocks in one direction from the centre, then the perpendicular rows. Build up the pattern systematically, pressing each block firmly down with hand pressure or a rubber mallet through a board.
Tapping: Use a tapping block (a piece of spare flooring with a protected face) — never strike blocks directly. Ensure each block is properly bedded — listen for a hollow sound (insufficient adhesive beneath).
Clean adhesive off surface immediately. Polyurethane adhesive that dries on the face of hardwood is very difficult to remove without damaging the surface.
Sanding
Wait minimum 48 hours after laying before sanding (72 hours for polyurethane adhesive).
Drum sander: Load with 36 grit. Run across the grain at 45° to the block direction — this flattens any lippage (height difference between adjacent blocks). Keep the machine moving at all times — stopping causes a hollow in the floor.
Second pass: 60 grit, at 45° in the opposite diagonal direction. This removes the coarse scratches from the 36 grit pass.
Third pass: 80 grit, along the grain direction (which for herringbone is typically along the room's main axis). This gives the grain-following appearance.
Edge sander: Use a belt-type edge sander for the perimeter (the drum sander cannot reach within 50–75mm of the skirting). Match the grit sequence to the main floor — do not leave edge areas at a different scratch pattern.
Final pass: Random orbital with 100–120 grit for a fine finish before applying the surface treatment.
Reclaimed blocks: Old blocks often have bitumen residue on the underside and sides. The surface may also have old lacquer or wax. These are removed by the sanding process — start with coarser grit (24 or 36) if the old finish is thick.
Finishing
Hardwax oil: Apply thin first coat and work into grain with a cloth, pad applicator, or single-disc machine with a white polishing pad. Allow to cure. Apply second coat. Buff lightly between coats if specified. Hardwax oil penetrates the wood — it does not build up a film. Easy to spot-repair. Good for family homes. Typical manufacturers: Osmo Polyx-Oil, Rubio Monocoat, Pallmann Magic Oil.
Lacquer: Apply seal coat (often 10–15% diluted lacquer thinned for penetration). Allow to cure. Sand with 220 grit. Apply second full coat. Allow to cure. Sand again. Third coat. Lacquer builds a plastic film on the surface — very hardwearing, glossy or satin finish. Repairs require full re-coating or sanding back. Good for commercial/high-traffic.
Staining: Apply stain before the finish coat. Always test on a scrap piece — stain colour varies dramatically between species and can be very different from the manufacturer's sample chip.
Frequently Asked Questions
Is reclaimed parquet worth using?
For period properties and for customers who want character, yes — reclaimed blocks are irreplaceable. However, reclaimed blocks require more preparation (de-nailing, cleaning, sorting for size and species consistency). Plan for higher installation time and more material waste. Price accordingly.
Can parquet be installed on underfloor heating?
Solid parquet over UFH is risky — wood and heat/humidity cycling can cause blocks to gap and lift. Engineered parquet (solid wood top layer on a plywood base) is much more dimensionally stable and is the recommended option for UFH. Maximum floor temperature 27°C. Commission UFH for 7 days minimum before laying.
How long does sanding take?
A 25–30m² room with no underfloor heating and a flat substrate takes an experienced fitter approximately one full day to sand and one day to coat (with drying time between coats). Rushed sanding shows.
My parquet floor has gaps in winter. Is this normal?
Yes, small seasonal gaps (up to 2mm) are normal in solid parquet as the wood responds to low winter humidity with central heating running. Gaps that appear during the first winter and close in summer indicate the floor was laid at an appropriate moisture content. Gaps that are wider than 2mm or remain all year suggest a moisture problem at installation.
Regulations & Standards
BS 8201:2011 — Code of practice for installation of flooring from wood and wood-based panels
BS 1297:1987 — Specification for tongue and grooved softwood flooring (relevant for border design)
Approved Document C — Ground floor damp requirements relevant to concrete subfloor prep
EN 1910 — Determination of dimensional stability of wood (moisture content reference)
Wood Floor Business UK Technical Guides — UK wood flooring trade association guidance
Osmo Polyx-Oil Application Guide — Hardwax oil application specification
British Wood Flooring Association — UK wood flooring installation standards
flooring types — Comparison of solid, engineered, and LVT flooring
screed types — Subfloor preparation for parquet
underfloor heating tiles — UFH commissioning relevant to all floor types
timber quantities — Wood quantity estimation guidance
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