Sometimes, flooring may develop issues such as swelling, arching, warping, cracking, movement, or gaps. These problems can occur in wood flooring, laminate flooring, SPC flooring, and other floating floor systems when site conditions, moisture levels, installation details, or indoor environment are not properly controlled.
Understanding the causes can help prevent future problems and identify the right solution.
Problem 1: Moisture-Related Swelling and Arching
Common Signs
Moisture-related swelling or arching may appear as:
- Flooring lifting or peaking at the joints
- Boards pushing against each other
- Raised areas or a “tenting” effect
- Warping or cupping
- Gaps or damage around the locking system
- Flooring feeling unstable when walked on
Possible Causes
Moisture is one of the most common causes of flooring movement. The issue may be related to the flooring itself, the subfloor, the room environment, or installation details.
Possible causes include:
- Continuous wet weather or high humidity
Long periods of rain or damp weather can increase indoor humidity if the space is not properly ventilated. - Poor ventilation
If a room remains closed for a long time, moisture may build up and cannot escape properly. - Water exposure or soaking
Wood flooring and laminate flooring can be affected if they are exposed to water or if moisture enters through joints and edges. SPC flooring is more water-resistant, but it can still be affected by installation conditions, subfloor movement, standing water, or poor perimeter detailing. - High subfloor moisture
Moisture from concrete, timber, plywood, or other substrates can affect flooring performance if it is not tested and controlled before installation. - Insufficient expansion gaps
Floating floors need space to expand and contract. If expansion gaps are too small or missing, the flooring may press against walls, columns, door frames, cabinetry, or fixed objects and begin to lift. - Large uninterrupted floor areas
If a floating floor runs over a large area without appropriate transitions or movement breaks, expansion pressure may build up. Manufacturer requirements for maximum continuous floor size should always be followed. - Unstable timber or panel subfloors
SPC, laminate, or wood flooring installed over decking, plywood, particleboard, or other timber-based subfloors may be affected if the subfloor moves, expands, shrinks, or is not stable enough. This can place stress on the locking system and may cause gaps, lifting, or warping.
Prevention
To reduce the risk of moisture-related swelling and arching:
- Keep rooms properly ventilated.
- Control indoor humidity where required.
- Clean spills promptly.
- Do not allow standing water to remain on the floor.
- Test subfloor moisture before installation.
- Ensure the subfloor is clean, dry, flat, stable, and suitable.
- Leave correct expansion gaps around all perimeters and fixed objects.
- Use movement trims or transitions where required by the manufacturer.
- Follow the flooring manufacturer’s installation instructions.
Possible Solutions
The correct solution depends on the cause and severity of the problem.
In some cases, the affected area may need to be lifted, dried, and reinstalled. In more serious cases, damaged boards may need to be replaced. If the expansion gaps are insufficient, the floor may need to be trimmed back and movement spaces restored.
Where the subfloor moisture is high or unstable, the moisture source must be addressed before reinstalling the flooring. Simply replacing the floor without fixing the underlying cause may result in the same issue returning.
Problem 2: Dry Shrinkage, Cracking and Gaps
Common Signs
Dry shrinkage may appear as:
- Gaps between boards
- Small surface cracks or checking
- Boards shrinking slightly
- Increased joint visibility
- Creaking or minor movement
- Timber surfaces feeling dry
Possible Causes
Dry shrinkage usually occurs when flooring loses moisture too quickly, or the indoor environment becomes too dry.
Possible causes include:
- Long-term closed indoor environment
If a room is closed for a long period without proper ventilation, the indoor environment may become too dry or unstable. - Seasonal humidity changes
Flooring can expand in humid conditions and shrink in dry conditions. This is especially common with timber and wood-based products. - Continuous dry weather or high indoor temperatures
Long periods of high temperature and low humidity may cause timber or wood-based flooring to lose moisture quickly. - Underfloor heating used incorrectly
Increasing the heating temperature too quickly or allowing the floor surface temperature to become too high may accelerate moisture loss. - Direct sunlight exposure
Strong sunlight can heat the floor surface and cause localised drying, shrinkage, fading, or movement. - Long-term direct airflow
Air conditioning, heaters, dehumidifiers, or concentrated airflow blowing directly onto the floor may dry the flooring unevenly.
Prevention
To reduce the risk of dry shrinkage, cracking, and gaps:
- Maintain a stable indoor environment.
- Avoid extreme indoor dryness.
- Use curtains or blinds to reduce strong direct sunlight.
- Avoid long-term direct heating or airflow onto the floor.
- Use underfloor heating gradually and within the manufacturer’s temperature limits.
- Maintain suitable indoor relative humidity where required.
- Follow the manufacturer’s care and maintenance instructions.
- Allow for correct expansion gaps during installation.
Possible Solutions
Some seasonal gaps may reduce naturally when indoor humidity returns to a more balanced level. In many cases, it is best to observe the floor for a period of time before deciding whether repair is required.
If gaps or cracks remain after the indoor environment has stabilised, individual boards may need to be repaired or replaced. In more serious cases, partial or full reinstallation may be required.
Where dry shrinkage has been caused by direct sunlight, heating, or excessive airflow, the environmental cause should be corrected first. Otherwise, the same problem may return after repair.
Important Reminder
Flooring movement is often caused by a combination of factors, not one single issue. Moisture, dryness, subfloor condition, expansion allowance, installation method, heating, sunlight, ventilation, and maintenance can all affect flooring performance.
To achieve the expected result, flooring must be:
- Correctly selected for the area
- Installed over a suitable subfloor
- Installed with proper expansion gaps
- Protected from excessive moisture and dryness
- Maintained according to the manufacturer’s guidelines
A good floor depends not only on the product itself, but also on correct installation, suitable site conditions, and proper ongoing care.
、
