Alexei Volkov
Thresholds are installed at the bottom of exterior or interior door frames and are essential components of a home's design. They can be made of wood, metal, laminated wood, tile, plastic, marble, or solid surface. Interior thresholds cover floorboard edges ending at a door and create a transition from one type of flooring material to another. They also help seal doorways, preventing objects and water from entering and reducing drafts. This article will provide a step-by-step guide on how to install a plastic threshold, covering everything from preparing the surface to securing the threshold in place.
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What You'll Learn
Measure the gap between the door and floor
Before installing a plastic threshold, it is important to measure the gap between the door and the floor accurately to ensure a proper fit. This gap measurement will determine the maximum thickness of the threshold. Here is a step-by-step guide to help you through the process:
Firstly, use a measuring tape to determine the distance between the bottom of the door and the floor. This measurement is crucial as it ensures that the threshold will not interfere with the door's operation. Make sure the door is closed when taking this measurement.
Next, measure the internal width of the door frame at floor level. This measurement will give you the length of the threshold. It is important to be precise with this measurement to ensure a snug fit.
Now, consider the type of threshold you want to install. Thresholds can be uniformly flat or beveled, with the edges lower than the centre. Beveled thresholds are also known as "disabled" thresholds because they are wheelchair-friendly. The type of threshold you choose may impact the measurements, especially if you require a custom-made solution.
After taking these measurements, you can select or create a threshold that fits your doorway. If you are using a pre-made threshold, test its fit by placing it in the doorway and ensuring the door swings freely. If adjustments are needed, you can use a plane to lower the threshold slightly.
Finally, once you are satisfied with the fit, you can proceed with securing the threshold in place using the appropriate method, such as screws, nails, or adhesive. Remember that a properly fitted threshold will enhance the energy efficiency of your home and prevent water damage and pest infestations.
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Choose threshold material
When choosing a plastic threshold, there are several factors to consider. Firstly, determine the placement of the door threshold. If it will be in a high-traffic area, opt for durable materials like aluminium or PVC that can withstand wear and tear. For exterior doors, consider a material that can withstand different weather conditions, such as UV and corrosion resistance, to prevent damage.
Secondly, measure the door opening to ensure you select a threshold with the right size and dimensions. A proper fit is crucial for the threshold to function correctly. If the threshold is too thick, it may prevent the door from closing comfortably.
Thirdly, consider the functionality and design of the threshold. For interior doors, a simple and uniformly flat threshold or a bevelled "disabled" threshold may be suitable. For exterior doors, a saddle threshold with a sweep or bottom can provide insulation and energy cost savings. Additionally, choose a threshold with a non-slip surface to prevent falls and accidents.
Lastly, consider the aesthetic appeal of the threshold. Plastic thresholds come in various colours and designs to match the interior or exterior décor, whether modern, classic, or rustic. The chosen finish, such as varnish, stain, or paint, should complement the overall style and colour scheme of the doorway. Remember to prepare the surface with fine sandpaper before applying the finish.
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Prepare the surface
Before installing a plastic threshold, it is important to prepare the surface to ensure a smooth and secure installation process and a long-lasting threshold. Here are the steps you need to follow:
Firstly, clean the surface thoroughly. Use a broom or a vacuum cleaner to remove any dirt, dust, or debris from the area where the threshold will be installed. It is important to ensure that the surface is free of any substances that could interfere with the adhesion of the threshold, such as grease or oil. Use a degreaser or a mild detergent to wipe down the surface and remove any stubborn residue. Make sure the surface is completely dry before proceeding.
Secondly, inspect the surface for any damage or irregularities. Look for cracks, holes, or uneven areas that need to be repaired or levelled. If there are any cracks in the concrete or damage to the flooring, use a concrete repair compound to fill and level the surface. Follow the instructions on the product you are using and allow the compound to dry completely before proceeding. This step is crucial for ensuring a stable and secure installation.
Next, use a putty knife or a trowel to apply a thin layer of floor levelling compound to the entire area where the threshold will be installed. This will create a smooth and even surface for the threshold to adhere to. Follow the instructions on the product and make sure the compound is spread evenly and smoothly. Allow it to dry completely according to the manufacturer's instructions.
Once the surface is clean, repaired, and levelled, it is important to create a rough surface for better adhesion. You can do this by lightly sanding the area with fine-grit sandpaper. This will help to create a slightly textured surface that will allow the adhesive to grip more effectively. Make sure to wear a dust mask and safety goggles to protect yourself from any debris or dust created during the sanding process.
Finally, remove any dust or debris created during the sanding process. Use a tack cloth or a damp cloth to wipe down the surface and ensure it is completely free of any residue. This step is important to ensure a strong bond between the adhesive and the surface. Once the surface is prepared, you can proceed to the next steps of installing your plastic threshold, following the manufacturer's instructions for the specific product you are using.
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Secure the threshold
Once you have prepared the surface and measured the space between the door and the floor, it is time to secure the threshold.
If your threshold requires screws, use a power drill and bit to create three to four holes along the length of the threshold. Drill the screws into the pre-made holes to attach the threshold in place. Ensure each screw is driven through the threshold and into the floor without creating a gap between the two. If you are drilling into concrete, you will need to use an anchor to screw it down.
If your threshold does not require screws, or you are installing it onto a concrete slab, secure it with an appropriate construction adhesive. If the floor is made of marble, an impact adhesive is often the best option. If you are using an adhesive, apply it to the threshold and the floor, and then fit the threshold in place. Place something heavy on the threshold to compress the adhesive and squeeze out any air pockets. If you are gluing the threshold to the floor, you can use liquid nails or a product like 100% silicone caulk, which is long-lasting and water-repellent.
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Finishing touches
Once you've installed your plastic threshold, there are a few finishing touches to consider. Firstly, ensure that the threshold is secure. If you've used an adhesive, place a heavy object, such as a bucket filled with water, on the threshold for 24 hours to weigh it down while the adhesive cures. If you've used screws, check that they are all driven through the threshold and into the floor without creating any gaps.
If you wish to add a finish to your plastic threshold, you can use varnish, stain, or paint. Prepare the surface with fine sandpaper, then apply at least two coats, allowing each coat to dry before applying the next. Cover all areas, including the ends, top, and sides.
To prevent water from pooling at your doorway, ensure that the threshold slopes slightly away from your home. You can use a plane to lower the threshold if needed. Additionally, use 100% silicone caulk to seal the back edge of the threshold, providing a long-lasting and water-repellent barrier.
Regular cleaning and maintenance will keep your plastic threshold in good condition.
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Frequently asked questions
A door threshold is a strip of wood, metal, or plastic that is installed at the bottom of exterior or interior door frames. It bridges the gap between rooms, sealing the doorway and preventing objects, drafts, and water from coming under the door.
First, measure the space between the bottom of the door and the floor, as well as the internal width of the door frame at floor level. Find a plastic threshold that fits these measurements. If necessary, cut notches into the threshold to fit it around the door jamb. If you are installing the threshold on concrete, use a concrete patch/resurfacer to create a smooth, level surface. Drill holes into the threshold and the floor, insert plastic anchors, and screw it down. Alternatively, use construction adhesive to glue the threshold to the floor.
You will need a tape measure, a saw, a drill, plastic anchors, screws, and construction adhesive.
If the doorstops are undercut, use a claw hammer and pry bar to remove the nails from the threshold.
Thresholds can wear down over time due to foot traffic. If your threshold is worn down, rotten, or no longer prevents drafts and water from entering the room, it may be time to replace it.
