Pre-Winter Parquet Check: A 7 Point Seasonal Checklist

A pre-winter parquet check means reviewing the moisture balance of the floor, the expansion gaps, the skirting boards and joints, the surface protection layer and the dirt barrier at entrances before the heating season begins. This seven point routine prevents most of the gapping, creaking and swelling problems that engineered floors suffer during winter.

Why a pre-winter parquet check is necessary

Winter is the hardest season of the year for wooden floors because indoor air dries out quickly and wood changes dimension in response.

Wood is a hygroscopic material, which means it absorbs and releases moisture from its surroundings. When radiators or underfloor heating come on, indoor relative humidity drops fast and in many homes falls to around 30 percent. That drop makes the solid wood lamella on the top layer of an engineered floor shrink, produces fine lines between the boards and, in some cases, causes clicking sounds. In summer the opposite happens and the boards expand again.

The aim of a seasonal check is not to stop this natural movement but to stop the movement from turning into damage. If the expansion allowance at the perimeter has been closed, if the skirting is pressing down on the boards, or if there is a localised moisture source beneath the floor, trouble becomes unavoidable once the heating starts. For material and technical background, the content in the engineered parquet articles section is a good starting point.

Item 1: Measure indoor relative humidity

The first job before winter is to measure relative humidity in each room with a simple hygrometer.

For wood and wood based floors, the comfort range accepted across the industry is 40 to 60 percent relative humidity at a temperature of 18 to 24 degrees. That is also the band recommended for human health. Measurements should not be taken at a single point. Check the living room, the bedrooms and the hallway separately, because humidity drops noticeably in areas close to radiators.

If the reading falls below 35 percent, an evaporative humidifier, broad leaved plants or drying laundry indoors can all help. If the reading stays above 65 percent, ventilation is insufficient and the risk shifts towards swelling. Noting the humidity once a week lets you predict how the floor will behave through the season. This tracking matters even more with wide formats, because in plank engineered parquet installations the wider the lamella, the greater the movement allowance required.

Items 2 and 3: Expansion gaps and skirting boards

Make sure the expansion gap along the walls is still open and free of obstruction.

In a floating installation, a perimeter allowance of roughly 10 to 15 mm is usually left, and that allowance is increased in large rooms. Moving furniture, a door threshold added later or a bead of silicone can all close the gap. Once it is closed, the floor cannot move and it lifts in the middle of the room. Lifting the skirting slightly to confirm the gap is visible is enough.

Skirting boards must be fixed to the wall, never to the parquet. Skirting that loosens or presses the boards down in winter is one of the most common causes of creaking and localised gapping. Also check that the cutting allowance has been preserved at transition points such as radiator pipes, door frames and stair landings. Using a rosette or a flexible filler at these points is a far better solution than sealing them with rigid cement mortar.

Step by step pre-winter engineered parquet care

A structured routine covers the whole floor in a single session and takes very little time.

1. Clear the entire floor of dust and grit using a vacuum with a soft brush head.
2. Wipe with a damp, well wrung microfibre mop that is never wet, using a cleaner suitable for wood.
3. Inspect the surface in daylight for dull patches, scratches or water marks.
4. Check along the skirting line that the perimeter expansion gaps have not been closed.
5. Measure relative humidity with a hygrometer and note whether it sits between 40 and 60 percent.
6. Start underfloor heating gradually and raise the water temperature slowly over the first days.
7. Place an absorbent dirt barrier mat at least 100 cm long inside the entrance door.

Carrying out these steps in order matters, because cleaning before inspection makes faults far easier to see, and measuring humidity before adjusting the heating gives you a baseline to compare against later in the season.

Item 4: Bring underfloor heating on gradually

On floors with underfloor heating, the system must never be switched to full power in one go.

The common practice is to start the heating at a low water temperature and reach the target value with daily increases of 3 to 5 degrees. This gradual transition prevents the wood from meeting a sudden thermal shock and drying too fast. The same approach applies when the system is shut down at the end of the season.

The critical limit is surface temperature. For wood and wood based coverings, the parquet surface temperature should not exceed 27 degrees, and in areas under rugs or bulky furniture that value can easily be passed because of heat build up. Choosing thin weaves instead of thick rugs, and using furniture legs that leave an air gap underneath, both help. For a new installation, screed moisture should be below 2 percent by weight in cement based screed and below 0.5 percent in anhydrite screed. Laying parquet mid winter without that measurement is one of the most frequent mistakes.

Items 5 and 6: Entrances, road salt and wet shoes

Most winter damage to parquet comes from water, grit and road salt carried in from outside.

If moisture brought in by snow and rain is not stopped at the door, it reaches the lamella directly and leaves whitening or dull marks along the edges. Road salt turns into abrasive crystals as it dries, acts like sandpaper under shoe soles and gradually dulls the lacquer layer. A two stage solution is therefore recommended in the entrance hall: a coarse mat outside the door, and an absorbent walk off runner at least one metre long inside.

In addition, high heels and soles with metal accessories should not be worn indoors, and felt pads should be fitted to chair and table legs. On patterned floors, dirt build up is more visible along the joint lines, so an entrance barrier matters even more on floors with detailed cutting such as Hungarian point engineered parquet.

Item 7: Assess the surface and intervene if needed

The final item is judging whether the finish layer can carry the floor through winter.

Oiled surfaces can be refreshed with maintenance oil before the heating season starts. On lacquered surfaces, if scratches have deepened enough to reach the wood, water absorption can begin at those points. Spot retouching, local polish refreshing or sanding free maintenance in heavily used corridors are all considered at this stage. On floors with a strong pattern, such as the installations described in the article on herringbone laminate flooring combining elegance and durability, any repair must follow the pattern.

With laminate options, the wear class is decisive. AC3 is chosen for homes, AC4 for heavily used areas and AC5 for commercial spaces, with thickness generally between 8 and 12 mm. She Parquet offers pre-season site inspection and maintenance support across engineered, laminate, SPC and solid wood options. If you are considering replacing material, the imported engineered parquet content makes comparison easier. The She Parquet team runs these checks as a standard procedure on hotel and residential projects.

Frequently Asked Questions

Are the fine gaps that appear in winter permanent damage?

No. In most cases these gaps are seasonal movement caused by wood shrinking in dry air. Once relative humidity returns to the 40 to 60 percent range, the gaps largely close again. If a gap keeps widening, a board lifts or noises appear, a professional inspection is needed.

What surface temperature should engineered parquet reach with underfloor heating?

For wood based coverings, the parquet surface temperature should not exceed 27 degrees. The system should be brought on gradually at the start of the season, raising water temperature in small daily increments until the target is reached. Thick rugs and heavy furniture trap heat and can push the floor past that limit.

How often and how should I clean parquet in winter?

Once or twice a week with a well wrung damp microfibre mop and a cleaner suitable for wood is enough. Large amounts of water, steam cleaners and abrasive chemicals must never be used on engineered parquet. Since grit and salt particles cause scratches, dry sweeping or vacuuming should be done more frequently.

Can new parquet be installed during the winter months?

Yes, but work should not begin before screed moisture is measured. Cement based screed is expected to be below 2 percent by weight and anhydrite screed below 0.5 percent. The material should also acclimatise in the room for at least 48 hours, with the ambient temperature kept stable.

What should I do if indoor humidity is very low?

If relative humidity stays below 35 percent, an evaporative humidifier is the most practical solution. Placing a water container near radiators, increasing the number of plants and avoiding excessive ventilation also help. Rather than acting without data, track the level with a hygrometer.