After installing your flooring, you’ll need to address the gaps near walls, doors, and stairs. Avoiding gaps entirely is impossible; it’s a crucial requirement when installing laminate.
Laminate should be installed with a gap from any surrounding structures, including walls, door frames, columns, fireplaces, etc. Due to temperature and humidity, the laminate can significantly change in size. The area of a continuous installation should not exceed 40 feet.
When installing laminate, exposed joints are typically found in the following areas:
- Along the walls.
- In doorways.
- Near stairs.
- At the intersection of two different types of flooring.
Baseboards can easily cover gaps along the walls. In other cases, a transition strip will be needed.
What is a Transition Strip?
The function of a transition strip is to join different types of flooring into a single, even surface. It prevents debris and moisture from gathering in the expansion gap, hides height differences between the floors, and protects the edges of the laminate from any damage.
For example, if you have laminate in your living room and tile in your kitchen, a transition strip will make the junction between these two types of flooring aesthetically pleasing and safe.
How to Choose a Transition Strip
To answer this question, let’s take a closer look at your situation.
What Type of Flooring Are You Connecting?
| Type of Floor Covering | Description | Recommended Transition Strip Types |
|---|---|---|
| A gap between two hard floor coverings. | Both surfaces are level with little or no height difference. |
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| A gap between two hard surfaces at different heights. | A gentle ramp is needed to avoid tripping. Not all strips work for height differences. |
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| A gap between laminate flooring and carpeting. | This joint usually has a height difference due to material thickness. |
|
Level of Operational Load
Not all transition strips can withstand the same level of operational load. This measure affects the choice of transition strip material. Evaluate where the gaps you need to cover are located.
If you need to cover a gap near a room with high humidity, it is recommended that you choose thresholds with waterproof properties. For example, thresholds made of plastic or aluminum handle moisture well and are resistant to corrosion. Also, pay attention to the type of threshold fastening. Choosing thresholds with a closed fastening type is better to prevent moisture from entering.
If you need to cover a gap in a high-traffic area or entryway, it is recommended that you pick thresholds made from durable materials such as metal or plastic. These thresholds are highly wear-resistant and can withstand a large amount of traffic.
What Material Should You Select?
| Material | Pros | Cons |
|---|---|---|
| Metal (steel, brass) | – Highly resistant to wear and tear. – Retains its appearance over time. – Available in many finishes: polished, matte, wood-look, and stone-look. |
– Not flexible; may be difficult to install over uneven gaps. – Cold to the touch. |
| Wood (pine, oak, ash, beech) | – Pairs well with laminate floors. – Available painted or unpainted. – Warm and pleasant to the touch. |
– Absorbs moisture and may swell or warp. – Requires regular maintenance and protective treatment. – Not flexible; difficult to install on uneven gaps. – Can dent or chip on impact. |
| PVC | – Resistant to damage, moisture, and temperature changes. – Available in many sizes and shades. – Flexible and easy to install. |
– Lacks natural wood texture. – Clips can break if installed improperly. |
Installation Difficulty
Evaluate the gaps you need to cover. A metal molding can cover a straight and wide gap. However, if the joint is not perfectly straight, it is easier to choose a PVC strip.
Some transition strips can be installed using adhesive. However, in this case, you won’t be able to replace it without damaging the flooring. For installing a strip with screws, you will need to drill into the concrete (or wood) and measure the height of the gap so the profile fits evenly. These strips do not damage the flooring.
Self-adhesive door thresholds are installed quickly and easily. The adhesive strip is located on the underside of the threshold. Such transition strips can only be used on hard surfaces and are suitable for rooms with low traffic.
Underfloor heating adds additional complexities when choosing a threshold. Homeowners often do not know how the heating system is laid out and whether it runs near the door. To avoid damaging the system, we recommend choosing adhesive-mounted thresholds.
Width of the Transition Strip
Narrow transition strips do not draw much attention, making them less noticeable in the overall design.
Wide transition strips are more visible and should be selected to either match the flooring perfectly, create a contrast, or ensure a smooth transition of tones. Wide thresholds are often used to conceal large gaps, defects, or uneven areas in the flooring.
Measure the width of each gap to choose the correct threshold width. Transition strips come in the following widths.
- Narrow threshold: up to 25 mm (1 in).
- Standard threshold: 26-50 mm (1-2 in).
- Wide threshold: more than 50 mm (2 in).
Important: The transition strip should extend one-third beyond the gap’s edges. As previously mentioned, laminate can expand and contract due to humidity and temperature. A threshold that is too narrow might sink into the gap during such changes.
Different Types of Transition Strips
The following types of transition strips are best suited for handling laminate gaps.
T-Molding
T-Molding, or T-Mold, bridges the gap between two hard flooring types that are at the same height. For example, if you have laminate in your living room and vinyl in your kitchen, T-Molding is designed to create a seamless transition between these types of flooring.
T-Mold is also convenient for concealing expansion gaps when the flooring area exceeds 40 feet. This expansion gap is necessary for any type of laminate installation.
!!!T-Molding is made from materials such as !!!wood, !!!aluminum, !!!steel, !!!brass, and !!!PVC. The standard profile length is 4 or 8 inches.
Reducer
Reducers help create a smooth transition for gaps with height differences. For example, transitioning from laminate to tile or from laminate to carpet. Installation options include adhesive or screws. The upper edge overlaps the laminate plank, leaving an expansion gap between the edge of the board and the molding.
Reducers are made from wood and PVC. The standard profile length is 4 or 8 inches.
Threshold
Threshold moldings are used to transition from wooden flooring to carpet or from wooden flooring to an exterior door. They can also be used in areas with sliding doors.
Thresholds are made from metal, wood, and PVC. The standard profile length is 4 or 8 inches.
4-in-1 Transition Strips
4-in-1 transition strips are versatile thresholds suitable for any type of gap. These strips can be used as T-Molding, reducers, end caps, or carpet transitions. They are most commonly made from wood and PVC. The standard profile length is 4 or 8 inches.
Stair Nosings
Stair nosings provide a transition between the floor and the steps. They bear the main load of foot traffic on the stairs and give the staircase a polished look. The standard profile length is 4 or 8 inches.
Specifics of Installing the Transition Strips
There are two ways to install the joining strip: adhesive or self-tapping.
General Tools You Will Need
- Measuring tape
- Metal shears (if you have a metal U Channel)
- Jigsaw, miter saw, or hand saw.
- Marker
- Vacuum cleaner
- Rubber Hammer
- Construction knife
Tools Needed For the Gluing Method
- Degreaser
- Construction adhesive
- Glue remover
Tools Needed For Installing Self-Tapping Screws
- 1/2-inch screws
- Screwdriver
- Drill if you have a rough concrete floor.
- Dowels if you have a concrete subfloor.
Preparation Stage
- Clean the gap of construction dust, tile adhesive drops, and other debris.
- Accurately measure the gap. If there is a height difference, T-Molding cannot be used.
Installation with Screws
Transition strips such as T-Mold, Reducer, Threshold, and 4-in-1 Transition Strips come with a U Channel, which holds the molding. The proper installation of the U Channel determines how aesthetically pleasing the threshold will look.
- Cut the U Channel to the length of the doorway. The profile can be made of plastic or thin metal.
- Insert the U Channel into the gap. The profile edges should be level with the flooring or 1 millimeter higher. If the gap is too deep, you will need to place a spacer under the molding. You can make a spacer from plywood or laminate scraps.
- Check your measurements. With the spacer, the U Channel should be level with the flooring (or 1 mm above or below).
- Attach the spacer to the floor using screws. Pre-drill holes with a drill and insert anchors if you have a concrete subfloor.
- Attach the U Channel to the subfloor or spacer using screws. Do not tighten them entirely at first; work gradually to ensure the profile sits evenly. If you tighten the screws too much, the U Channel will deform, making it difficult to insert the threshold cover.
- Cut the profile to the length of the gap. Carefully insert it into the U Channel and tap it into place with a rubber mallet.
Important: We recommend sealing the tile joint at the laminate-tile interface. This prevents moisture from the tiled area from seeping into the laminate and damaging it. Sealing the laminate joint is unnecessary; the laminate needs space to expand.
Installation of Transition Strip with Adhesive
- Clean the gap of debris and dust.
- Degrease the edges of the flooring.
- Cut the threshold to the gap length and test it to fit the piece.
- Apply adhesive to the edges of the joint and attach the profile. Immediately remove any excess adhesive to avoid damaging the flooring. Some thresholds come with a pre-applied adhesive base, in which case additional adhesive is not needed.
- Place a weight on top of the threshold (paint buckets, cement bags, or similar items).
Important. Note that the adhesive prevents the laminate from expanding. We do not recommend using this type of connection if screws can be used in your situation. The only case where adhesive is necessary is when installing stair nosings.
Final Thoughts
Expansion gaps around laminate flooring aren’t a defect—they’re necessary to prevent buckling as temperature and humidity change. Transition strips cover these gaps, protect floor edges from wear and moisture, and provide a safe walking surface.
- The right transition strip depends on four key factors:
- Type and height of the two floor coverings
- Location of the gap (doorway, wall, stairs, etc.)
- Level of foot traffic and moisture exposure
- Preferred installation method—adhesive or screws
For same-height hard surfaces, a simple T-molding will do. For height differences, use a reducer or threshold. In wet areas or rooms with underfloor heating, adhesive strips may be safer to avoid drilling into sensitive zones. And if you’re not sure which type you need, 4-in-1 transition strips offer flexibility for most situations.
Accurate measurements, proper preparation, and the right materials are key. A poorly chosen strip can damage the flooring or interfere with its natural movement. A well-fitted one will do its job quietly for years—no squeaks, no warping, no edge damage.
If you’re just starting your flooring project, our Laminate Flooring Buying Guide explains how to choose the right type, thickness, and AC rating before installation.
