There are many considerations to choose the best way to fill gaps in wood floors. A container carries all kinds of cargo all year round; it needs a strong floor structure to increase its longevity and protect the goods from harsh climates and other external impacts.
Usually, the flooring of the container is made of tropical wood such as Keruing or Apitong. This wood provides the highest resistance to high temperatures and humidity, and can withstand the weight of various types of cargo (from 10-12).
However, wood attracts pests that can make gaps all around the floor. To know the best way to fill gaps in wood floors of a container, read this article!
Contents
Why are Containers Using Wood Floors?
Most shipping containers already come with marine-grade wood floors (usually 28-30 mm thick). They are designed to be durable, water-resistant, and pest-resistant, with longer durability and fewer defects than standard wood.
Wood floor is slightly flexible and less abrasive, reducing the risk of scratching delicate items and damaging packaging. Its natural cushioning effect helps absorb minor shocks and vibrations.
Moreover, its surfaces have a higher grip than metal or polished concrete. With that feature, items are less likely to slide during loading, unloading, or minor movement, making stacking more stable.
If you need the containers to store or ship heavy loads, this is the best floor type for that. Wood floors can support heavy loads but may sag over time under concentrated weight. Use load-spreading mats or platforms for cumbersome items like machinery or pallet stacks.
How to Fill Gaps in Wood Floors
Step 1: Clean the Gaps
Clean the wood floor gaps by sweeping or vacuuming debris. Then, use a wire brush or compressed air to remove dirt from between the floorboards. Make sure the area is dry before applying any filler.
Step 2: Choose the Right Filler
For small gaps, use exterior-grade wood filler or epoxy wood repair compound. Meanwhile, for wider or irregular gaps, consider using epoxy with wood dust, or cut custom wood strips and glue them in place.
Step 3: Apply the Filler
Use a putty knife or a gloved hand to press filler into the gap. If you use epoxy-based filler, mix the components thoroughly before applying. Then, slightly overfill to allow for sanding flush.
Step 4: Let It Cure
Follow the manufacturer’s curing time (usually 12-24 hours). Close or cover the container to avoid debris falling in while drying.
Step 5: Sand and Seal
Lightly sand the filled areas flush with the surrounding wood. Apply a polyurethane, epoxy coating, or marine sealant to protect the floor from future moisture damage and wear.
If gaps are caused by moisture changes and monitor humidity, adding a dehumidifier or floor mat can prevent future shifting.
Materials to Fill Gaps in Container Wood Flooring
Here are materials you can use to fill gaps in the wood floors of a shipping container. This depends on the size of the gaps, intended use, and exposure to moisture or load:
Exterior Wood Filler
The exterior wood filler is best for small, shallow gaps (≤¼ inch). It is sandable, paintable, and easy to apply. However, it is not ideal for heavy loads or high-moisture environments.
Epoxy Wood Filler or Epoxy Resin
The epoxy wood filler or epoxy resin is best for deep or wide gaps, structural repairs. This type of filler is waterproof, extremely durable, and bonds well to wood. One thing you need to know when choosing epoxy wood filler or epoxy resin is that it requires mixing and more drying time.
Wood Putty
If there are only small cracks on your floor, this easy-to-use and flexible filler will be enough. However, it is not structural and not sandable after drying. You can only use it for indoor containers or light use.
Flexible Caulk or Sealant (Polyurethane/Silicone)
Gaps that may expand/contract with moisture or movement need flexible caulk or sealant. It will stay flexible and is moisture-resistant. However, it is not sandable or paintable in some cases.
Wood Strips + Construction Adhesive
Wood strips + construction adhesive are the best combo for the large or missing sections. They have structural strength and long-term fix despite requiring precision cutting and adhesive setting time.
Sawdust + Wood Glue
Sawdust + wood glue is one of the homemade fillers that are best for small fills using matching wood. It is cost-effective and can be a good color match. However, they are not moisture- or load-resistant.
Concrete Patch or Mortar
The concrete patch or mortar is a non-wood alternative filler. This is best for industrial containers or when sealing to convert to a concrete overlay. This type of filler is heavy-duty and water-resistant. However, it has no flexibility, making it unsuitable for moving containers.
Conclusion
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We are a reliable shipping container sales, purchase, rental, and modification service company. We provide modification and custom shipping container services to residences by adding windows, doors, walls, and roof insulation.
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