CRAFT Hardwood Guides
Common Wood Floor Installation Mistakes (And How to Avoid Them)
What every homeowner should know before their herringbone floor is installed — from someone who's seen what goes wrong and why.
Written by Wojciech, founder of CRAFT Hardwood | Updated March 2026 | 12 min read
If you're planning a herringbone or parquet floor, this guide is written in the spirit of a knowledgeable friend giving you honest advice before you spend a significant amount of money.
Not to frighten you — the vast majority of professionally installed floors perform beautifully for decades. But over the years we've been called to assess floors that weren't performing as they should, and the causes are almost always the same. Understanding them before your installation begins costs nothing. Finding out about them afterward can be expensive.
One thing worth saying clearly at the start: the problems described in this guide rarely come from professional hardwood flooring installers. They come most often from general builders, handymen, or keen DIYers who have taken on a job that requires more specialist knowledge than they realised. Herringbone looks deceptively straightforward. It isn't. The geometric pattern is unforgiving in a way that straight plank installation simply isn't — every imperfection is amplified and visible.
This guide explains what proper installation involves, why each step matters, and what to look for when choosing who to trust with your floor.
1. Moisture testing skipped or rushed
Of everything that can go wrong with a wood floor installation, moisture is the most common culprit. Not dramatically — no floods, no obvious leaks — just the ordinary moisture that exists in subfloors and in the air, undetected because nobody checked.
Wood absorbs moisture from its environment. A floor installed over a subfloor that is too wet will absorb that moisture after installation — causing cupping, gapping, or in worse cases, sections of floor lifting. The floor can look perfect on installation day and begin to fail within months.
Why this happens: moisture testing takes time and equipment. A general builder moving between different trades on a renovation project may not own a moisture meter, may not know what readings are acceptable, or may assume that because the concrete looks dry it is dry. Concrete that looks and feels dry can still be releasing significant moisture vapour — particularly in new builds where the slab was poured recently.
What good practice looks like: moisture is tested at multiple points across the subfloor — not just one reading near the door. For concrete, relative humidity within the slab is measured rather than just the surface. For timber subfloors, moisture content is checked across the floor and compared to the moisture content of the timber being installed. The timber itself is verified after acclimatisation before installation begins.
The friendly advice: ask whoever is installing your floor how they test moisture and what readings they consider acceptable before proceeding. A confident, specific answer — particular equipment named, specific acceptable levels given — tells you this is part of their standard process rather than an afterthought.
2. No damp-proof membrane on concrete
If your floor is being installed over concrete, a damp-proof membrane is not optional.
Concrete is porous — ground moisture migrates upward through it continuously, regardless of how dry the surface appears. Without a DPM between the concrete and the timber above it, that moisture will eventually reach the floor.
The failure mode is slow and predictable: the floor installs cleanly, looks excellent for a few months, and then begins to cup as moisture migrates upward into the timber. By the time the cupping is visible, the adhesive bond beneath may also be compromised.
Why this happens: a liquid DPM adds both cost and time to a project. For someone quoting as cheaply as possible or trying to complete the job quickly, it's a tempting omission — particularly if the concrete appears dry and the client hasn't asked about it specifically.
What good practice looks like: liquid DPM applied to the concrete surface at the manufacturer's specified coverage rate, allowed to fully cure before installation proceeds. This is a standard part of any professional concrete floor installation and should appear as a line item in the quotation.
The friendly advice: when you receive a quote for installation over concrete, check that DPM is included and named. If it isn't in the quote, ask why. It should be there.
3. Timber installed without proper acclimatisation
Timber delivered on a Monday and installed on a Tuesday is one of the most reliable predictors of a floor that moves excessively after installation.
Wood is a natural, hygroscopic material — it absorbs and releases moisture in response to its environment. Timber delivered from a warehouse or supplier is at a moisture content that reflects where it's been stored, not where it's going to live. Before installation, it needs time to adjust to the conditions of your home. Install it before that adjustment is complete and the floor will continue moving after it's fixed in place — causing gaps, cupping, or pressure against the walls.
Why this happens: acclimatisation takes time — a minimum of seven to fourteen days, sometimes longer for reclaimed solid timber. On a project being managed by a general builder juggling multiple trades and a tight programme, waiting a week for timber to acclimatise can feel like an unaffordable delay.
What good practice looks like: timber delivered to the property and stored in the rooms where it will be installed — not in a garage or outbuilding — with heating running at normal living temperature. Moisture content checked before installation begins to confirm acclimatisation is complete.
The friendly advice: when agreeing the installation programme, ask when the timber will be delivered relative to the start of installation. If the answer is the same day or the day before, have a conversation about why acclimatisation matters.
4. Pattern not centred in the room
This one doesn't cause structural problems. It causes something arguably more frustrating — a floor that looks slightly wrong in a way that's hard to articulate but impossible to unsee once you've noticed it.
A herringbone floor that isn't properly centred has unequal cuts at opposite walls. The pattern appears to drift toward one side of the room. The visual symmetry that makes herringbone so satisfying — that sense of everything being exactly where it should be — is absent.
Getting the centring right requires careful calculation before a single board is laid. The starting point must account for the room's exact dimensions, the specific block size being used, and any irregularities in the room's geometry — chimney breasts, bay windows, alcoves. Most rooms aren't perfectly square, and the starting point needs to compensate for this.
Why this happens: starting from a wall is faster than calculating the true centre. A builder who hasn't done this specific calculation before may not realise that starting from a wall almost always results in an uncentred floor.
What good practice looks like: the centre of the room is calculated, the pattern is set out from the centre outward, and the starting point is adjusted to account for any irregularities before any boards are fixed.
The friendly advice: ask whoever is installing your floor how they establish the starting point. The answer should involve calculating the room centre, not starting from a wall.
5. Expansion gaps too small or absent
Wood expands and contracts with changes in humidity and temperature. This is entirely normal and expected — it's simply how timber behaves. Every wood floor installation must leave space around the perimeter for this movement to happen.
When expansion gaps are too small — or absent entirely — the floor has nowhere to go when it expands. The result is buckling or lifting in the centre of the room. In herringbone floors, where the pattern creates diagonal stress lines across the floor, this lifting can be dramatic.
Why this happens: expansion gaps are hidden beneath skirting boards and are invisible in the finished floor. To someone who doesn't fully understand why they're there, they can seem like an unnecessary precaution.
What good practice looks like: 10-15mm expansion gaps around the perimeter for most residential installations, larger for bigger rooms and solid timber.
The friendly advice: ask what expansion gap will be left.
6. Uneven subfloor — and not telling the client
This one requires a more nuanced conversation than the others — because the right answer isn't always to level the subfloor before installation.
A herringbone floor laid over a subfloor that isn't perfectly flat will follow the contours of what's beneath it. The geometric pattern makes surface undulation more visible than straight plank installation — the diagonal lines catch raking light and reveal variation that a plank floor would partially disguise.
The accepted tolerance for most herringbone installations is 3mm over a 1.8m span. Beyond this, the undulation becomes visible in the finished floor.
But here's the nuance: in the North West particularly — where properties across Southport, Liverpool, and Lancashire were frequently built on sandy or unstable ground and have settled significantly over a century or more — perfectly level subfloors are genuinely rare. Levelling a significantly uneven subfloor can cost more than the floor installation itself, raise the finished floor height with implications for doors and adjacent rooms, and still not achieve perfect flatness in a building that continues to move gently with the seasons.
We've installed floors on uneven subfloors many times — and will continue to do so — because for many clients in period properties, the alternative is no floor at all. That's a completely legitimate decision.
The problem isn't installing over an imperfect subfloor. The problem is doing so without having an honest conversation with the client first. A client who understands that their floor will gently follow the contour of their settled Victorian hallway — and has made a conscious, informed decision to proceed on that basis — is in a completely different position from a client who expected a flat floor and received an undulating one with no prior discussion.
The friendly advice: ask how the subfloor will be assessed for flatness and what the options are if it falls outside tolerance. The answer should include a genuine choice — levelling, or proceeding with a clear explanation of what the finished floor will look like — not a single default response either way. A contractor who presents options and explains the implications honestly is the one to trust.
7. Wrong adhesive or wrong coverage
Herringbone and parquet installation requires dedicated parquet adhesive — not general-purpose flooring adhesive, not tile adhesive, not whatever happens to be on the van.
Parquet adhesive is specifically formulated for small block installation. It has the right open time, flexibility, and bond strength for timber blocks that expand and contract differently from large planks. The wrong adhesive may hold initially but fails under the repeated mechanical stress of daily use and seasonal movement.
Equally important is coverage rate. Adhesive applied too thinly — to save cost on materials or to speed up the installation — establishes a partial bond rather than a full one. Adequate initially, it fails over time.
Why this happens: parquet adhesive is more expensive than general-purpose alternatives. For a general builder doing an occasional floor rather than a specialist, the specific product may simply not be something they've sourced or used before.
What good practice looks like: professional-grade parquet adhesive, applied at the manufacturer's specified coverage rate, over a clean and properly prepared subfloor surface. The adhesive should be named specifically — not referred to generically — in any conversation about materials.
The friendly advice: ask what adhesive will be used by name. A specialist will know exactly what product they use and why. Ask also how the subfloor surface will be prepared before adhesive is applied — a dusty or contaminated surface compromises the bond regardless of adhesive quality.
8. Finishing rushed or cut short
The finishing stage — sanding and applying the protective coats — is where the floor's long-term appearance and durability are determined. It's also the stage most vulnerable to being rushed on a time-pressured project.
Specific things that go wrong:
Coats applied without sanding between them. Each finish coat needs light sanding before the next is applied — this creates the mechanical adhesion between coats that makes the finish durable. Skip this and the finish delaminates under use.
Next coat applied before the previous one has cured. In cold or humid conditions this takes longer than in warm dry conditions. A coat applied too soon traps solvents beneath it, causing cloudiness or softness in the finished surface.
Floor returned to use too quickly. Finish coats feel dry to the touch within hours but take days or weeks to fully harden. Furniture placed too early leaves permanent impressions. Rugs placed too early cause discolouration.
Why this happens: finishing requires patience more than skill. Waiting for coats to cure properly is simply time — and time costs money on a project with a tight programme.
The friendly advice: ask how many coats will be applied, what drying time is allowed between coats, and how long before the floor can be walked on, have furniture replaced, and have rugs laid. Specific answers indicate a proper process. Vague answers about "a day or two" warrant a follow-up conversation.
9. Joint quality in the herringbone pattern
This is the one that most clearly separates a herringbone specialist from a generalist having a go.
Tight, consistent joints across a herringbone floor require precision cutting and constant checking throughout the installation. Every block must be cut to exactly the same length. Every joint must close fully. Any small tolerance that accumulates across the width of the floor results in joints that drift progressively open from the starting point outward.
In straight plank installation, minor joint inconsistency is barely noticeable. In herringbone, the geometric pattern amplifies every deviation. A joint 0.5mm wider than it should be is invisible in isolation — but twenty such joints in a row create a visible gap line that catches the light across the entire floor.
This skill is developed through repetition. There's no shortcut to it. A specialist who has installed hundreds of herringbone floors has encountered the problems, understood the causes, and refined the process. Someone doing their fifth or tenth herringbone floor is still learning — and your floor is part of that education.
The friendly advice: ask to see close-up portfolio photography of completed installations. Not wide-angle room shots — close-ups of the joints and pattern. The quality of joints in portfolio photography is one of the most reliable indicators of installation standard.
10. Not protecting the rest of your home
The final point isn't about the floor itself — it's about everything around it.
Installation generates dust, particularly during cutting and sanding. It requires access routes through the property for materials, tools, and equipment. Adhesives and finishes can permanently damage surfaces they contact unexpectedly.
None of the consequences — dust throughout the house, stair carpets worn by heavy foot traffic — are inevitable. They're the result of not thinking carefully enough about the rest of the property before work begins.
The friendly advice: ask what measures will be taken to contain dust during cutting and sanding, and protect access routes. A tradesperson who has thought about this will answer confidently and specifically. One who seems surprised by the question probably hasn't thought about it.
The common thread
Reading through these points, a pattern emerges.
The problems almost never come from malice — they come from a lack of specialist knowledge, time pressure, or simply not having done this specific type of work enough times to have encountered the consequences.
Herringbone and parquet flooring is specialist work. It looks like flooring — and it is — but the precision it requires, the specific products it needs, and the preparation it demands are different in kind from general floor laying. A general builder who is excellent at everything else they do may not have the specific experience that herringbone installation requires.
This isn't a criticism of general builders — it's simply an honest description of what the job involves. The best outcome for everyone is a client who understands what proper installation requires, asks the right questions before committing, and chooses someone whose experience matches the work.
Frequently Asked Questions
Q: My floor was installed six months ago and is already cupping. What's likely to have gone wrong?
A: Cupping within months of installation almost always points to a moisture issue — subfloor not adequately tested, DPM absent or inadequate, or timber not properly acclimatised before installation. Sometimes all three. The priority is identifying the moisture source before planning any remediation. We're happy to assess and give an honest opinion.
Q: The herringbone pattern in my room isn't centred. Can it be fixed without relaying the floor?
A: Unfortunately not. The centring of a herringbone floor is determined by the starting point — once laid, the only remedy is to relay the floor from a corrected starting point. It's one of the strongest arguments for getting this right before installation begins rather than after.
Q: My floor has developed a squeak in one area. Should I be worried?
A: A single localised squeak usually indicates a loose block or minor adhesive void — both typically addressable without major intervention. Widespread squeaking, or squeaking accompanied by visible board movement, is worth having assessed professionally.
Q: How do I know if my expansion gaps are adequate?
A: Remove the skirting board or beading in a low-visibility area and measure the gap between the floor and the wall. It should be at least 10mm for most residential rooms, more for larger spaces. A floor tight against the wall with no gap is a problem worth addressing before the floor goes through a summer.
Q: I've had a quote significantly cheaper than others. What might explain it?
A: The most common explanation is scope — the cheaper quote may simply exclude things the others include. Ask for a line-by-line breakdown and compare like for like. DPM, subfloor preparation, adhesive, and finishing coats are the items most commonly omitted from low quotes. Understanding what's been excluded tells you whether the saving is genuine or illusory.
Q: Can a floor with installation problems always be saved?
A: Usually yes, if the timber is structurally sound and the problem is caught reasonably early. Moisture problems addressed promptly, adhesive failures in limited areas, finish issues — all of these are manageable. Floors where moisture damage has been extensive or where the timber itself is beyond the depth that sanding can address may need partial or full relay. An honest assessment is always the starting point.
Thinking about a new floor — or concerned about an existing one?
If you're planning a herringbone installation and want to understand how we approach the processes described in this guide, we're happy to talk through it during a free site visit. We believe an informed client gets a better result — and we're always happy to explain exactly what we do and why.
If you have an existing floor that isn't performing as it should, we're equally happy to take a look and give you an honest assessment of what's happened and what the options are.
We offer free site visits across Lancashire, Greater Manchester, Merseyside, and Cheshire.
Call: 07856 308 208 Email: contact@crafthardwood.co.uk
We serve Chorley, Lancashire, Greater Manchester, Liverpool, Chester, and throughout the North West.