Parquet Flooring Installation

Quick Answer: Parquet flooring — solid wood blocks or engineered wood panels laid in geometric patterns — requires a subfloor moisture content below 75% RH and a timber moisture content below 10% before laying. Traditional solid parquet blocks are glued with SBR rubber or bitumen dispersion adhesive directly to concrete; engineered parquet panels can be glued, click-floated, or mechanically fixed to timber subfloors. The herringbone and basket-weave patterns that define parquet both require setting out from the centre of the room, not from a wall.

Summary

Parquet has made a significant comeback in UK residential and commercial interiors over the past decade. Where the 1970s saw thousands of square metres of solid parquet blocks — often in public buildings, schools, and older domestic properties — ripped out in favour of carpet, the same blocks are now being salvaged, sanded, and relaid at a premium. New installations use either reclaimed solid blocks, engineered parquet blocks (a solid wood lamella on a plywood or HDF core), or large-format engineered parquet panels that achieve the herringbone visual more rapidly.

The critical difference between parquet and standard plank flooring is the pattern. Herringbone, basketweave, and brick bond patterns are all set out from a datum point in the centre of the room and work outward to the perimeter. Starting from a wall — the instinct for most fitters — produces badly cut partial pieces at the opposite wall and destroys the symmetry of the pattern. Parquet setting-out is a separate skill from general flooring installation.

This article covers solid parquet blocks and engineered parquet. For the full story on adhesive selection and the sanding and finishing process for reclaimed blocks, the existing article on parquet and herringbone flooring: adhesive, sanding, and finishing is the primary reference.

Key Facts

• Solid parquet block dimensions — traditional UK solid parquet: typically 230mm × 70mm × 20mm or 225mm × 75mm × 22mm; some heritage buildings use 150mm × 50mm × 18mm
• Engineered parquet panel sizes — typically 600mm × 600mm herringbone panel, or individual engineered blocks 230mm × 70mm × 15mm (plywood backed)
• Moisture content — wood — must be ≤10% MC before laying; test with a calibrated pin moisture meter. Wood above 12% MC will shrink after installation and leave visible gaps
• Subfloor moisture — ≤75% RH on concrete; ≤14% MC if timber subfloor
• Acclimatisation — minimum 5–7 days at room temperature in the installation space; some manufacturers specify 2 weeks for solid blocks
• Adhesive for solid blocks on concrete — SBR rubber dispersion adhesive (flexible, allows minor movement) or modified silane-based adhesive; never use rigid cement-based adhesive on solid wood
• Adhesive for engineered parquet on concrete — flexible adhesive (MS polymer or polyurethane one-component); trowel notch per manufacturer
• Adhesive for parquet on timber subfloor — secret nail or glue+nail (secret nail using 45° pneumatic cleat nailer through tongue of block)
• Expansion gap — minimum 10mm at all perimeter walls for solid parquet; engineered parquet typically 8–10mm
• Acclimatisation for reclaimed blocks — stack in space for 2+ weeks loose, not banded; allow air circulation around every layer
• Herringbone setting-out — set out two centre lines at 90° from room centre; dry-lay a test run of 6–8 rows before adhesive to check pattern alignment before committing

Quick Reference Table

Detailed Guidance

Setting Out for Herringbone

Herringbone is the most common parquet pattern in UK residential installations. Setting out incorrectly is the most common mistake.

1. Find the geometric centre of the room (measure both axes, mark the intersection)
2. Snap a chalk line across the full width of the room — this is the primary axis
3. From the centre point, snap a second chalk line perpendicular to the first — the secondary axis
4. Dry-lay two rows of blocks from the centre, one along each chalk line, to establish the setting-out lines
5. The point where the blocks meet at the centre must be in whole-block increments — adjust the centre point slightly if necessary to achieve whole blocks at the most visible part of the floor
6. Work outward from centre in quadrants; all cuts should be at the perimeter, hidden by skirting

For herringbone, each block alternates between 0° and 90°. The 45° visual is created by the alternating angle, not by laying the blocks at 45° to the room axis. The primary axis should typically run parallel to the longest wall or the main entrance view.

For basket weave (pairs of parallel blocks alternating direction), the setting-out follows the same centre-line principle, with the module width being 2 blocks + joint.

Adhesive Application for Glue-Down Parquet

Apply adhesive with the notched trowel specified by the manufacturer — typically a B1 (1mm×3mm×3mm) or A2 (4mm×4mm) notch for parquet blocks. Spread adhesive over an area you can lay within the working time (typically 30–45 minutes for SBR, 60–90 minutes for MS polymer).

For SBR adhesive: lay blocks while the adhesive is still wet and slightly tacky — not after full skinning over. Press each block firmly and tap level with a rubber mallet.

For MS polymer adhesive: the adhesive must flash off to a surface skin before laying (check manufacturer data sheet — typically 10–20 minutes). This provides an immediate bond rather than a grip bond.

Work from the centre outward. Do not stand on freshly laid parquet — use a kneeling board to spread your weight.

Installing Solid Parquet on Timber Subfloors

On a timber subfloor (concrete base with a ply overlay, or first-floor timber), secret-nailing is typically used for solid blocks:

1. Overlay the subfloor with 18mm or 22mm plywood (C4 exterior grade minimum), joints staggered, screwed at 150mm centres
2. Ensure ply is flat to ±2mm per 1m
3. Apply adhesive (MS polymer or PU) to the back of each block — this supplements the nail fixing
4. Drive a 45mm cleat nail or staple through the tongue of each block at 200mm centres using a pneumatic cleat nailer (floor nailer)
5. First two rows adjacent to walls must be face-nailed (nails punched below surface, filled)
6. Engineered blocks narrower than 50mm cannot be secret-nailed effectively — glue-only method required

Sanding and Finishing Solid Parquet

New solid parquet is typically pre-finished or unfinished. For unfinished:

1. Initial belt sand across the grain at 45° to the block direction using 40 grit — removes mill marks and levels any unevenness between blocks
2. Belt sand at 45° in the opposite direction — removes scratches from first pass
3. Belt sand along the grain at 40 grit, then 60 grit
4. Edge sand all perimeter areas
5. Random orbital with 80 grit, then 120 grit
6. Apply hardwax oil or lacquer finish (see parquet finishing: hardwax oil vs lacquer)

Sanding parquet across the grain direction is essential for a flat result. If you sand only along the block direction, the joints between blocks will be visible as ridges or shadows.

Herringbone Pattern Troubleshooting

Common problems and their causes:

• Pattern drifts off-line after 10–15 rows — blocks are not exactly square, or the tongue-and-groove profile introduces cumulative error. Correct by snapping chalk lines every 10 rows and adjusting alignment back to datum
• Gaps between blocks — blocks were too wet (MC above 10%) at time of installation, or room temperature increased significantly after installation; engineered product is much more stable
• Blocks are loose — adhesive coverage insufficient (trowel too small), or open time was exceeded before laying
• Pattern looks "off" near perimeter — setting-out was not from centre, or the room is not square; minor adjustments to the border cuts can correct visual irregularities

Frequently Asked Questions

Can I lay parquet over underfloor heating?

Solid parquet blocks are not recommended over UFH — the heat cycles cause significant movement in solid wood. If UFH is present, use an engineered parquet with a maximum 15mm total thickness and follow the UFH commissioning protocol before laying. Most engineered parquet manufacturers specify a maximum floor surface temperature of 27°C and a maximum heating rate of 5°C/hour.

How much waste should I allow for herringbone?

10–12% waste for a straight herringbone pattern. 15% for rooms with many alcoves, projections, or bay windows. At 45° diagonal herringbone (blocks laid at 45° to the room rather than parallel), allow 15–20% waste due to the additional perimeter cuts.

What is the difference between solid and engineered parquet?

Solid parquet is 100% solid wood throughout its thickness (18–22mm). Engineered parquet has a 3–6mm solid wood wear layer bonded to a plywood or HDF core. Engineered is more dimensionally stable, more compatible with UFH, and can be used on concrete slabs with a DPM. Solid parquet should not be used below ground level or in areas with high humidity variation.

Can reclaimed parquet blocks be relaid?

Yes, subject to moisture testing and assessment of the block thickness. Reclaimed blocks sanded and relaid before should have enough thickness remaining for at least one more sand cycle — they need a minimum of 6mm from the top surface to the tongue. Stack flat during acclimatisation (not on edge) and discard any warped, cracked, or undersized blocks.

Regulations & Standards

• BS 8201 — Code of practice for flooring of timber, timber products, and wood-based panels

• BS 8203 — Code of practice for installation of resilient floor coverings (relevant for adhesive and moisture testing methods)

• Building Regulations Part E — sound insulation requirements; solid parquet on concrete in flats requires acoustic underlay

• HHIC (Hevea Hardwood Industry Council) — timber sustainability sourcing; FSC or PEFC certification for new solid wood parquet

• Wood Floor Business: Installation Guide — UK-specific parquet and solid wood flooring installation guidance

• British Floorcovering Association — technical bulletins on wood floor installation and moisture requirements

• Bona UK Technical Guides — adhesive and finishing product data for wood flooring

• parquet and herringbone flooring: adhesive selection, sanding, and finishing — the complementary article covering reclaimed block, sanding sequence, and oil/lacquer finish choice

• subfloor preparation for hard floors — moisture testing, levelling, and ply overlaying

• hardwood floor sanding: drum sander grits and finishing schedule — sanding sequence detail for solid wood floors