The Premier Single 4 door threshold provides a neat and secure way to join thin stick-down carpets and natural sisal flooring to floorboards and thin vinyl flooring. Featuring a smooth curved edge and available in a choice of 10 natural metal finishes, it creates a tidy transition while helping to conceal exposed flooring edges.
Description
The Premier Single 4 is designed for joining thin stick-down carpets and natural sisal, up to 4mm thick, to floorboards and thin vinyl flooring. Its curved profile creates a smooth transition between the two floor coverings, helping to avoid a trip hazard while providing a neat, professional finish.
Designed for use on level floors, the threshold lies flat once installed. The carpet is held securely under tension by the integrated teeth, while the adjoining floor covering sits beneath the curved edge. This helps prevent raw carpet edges and avoids the carpet becoming rucked up after fitting.
Suitable for thin carpets only, the underlay should stop short of the door threshold during installation. Manufactured from solid brass with rounded edges, the Premier Single 4 is available in a choice of 10 hand-finished, unlacquered metal finishes. It is also known as the Premier Trim Single or Single Naplock.
If you are fitting a standard thickness carpet, the manufacturer recommends choosing the Premier Single 9 instead.
Key Features
- Designed for joining thin stick-down carpets and natural sisal up to 4mm thick
- Suitable for joining to floorboards and thin vinyl flooring
- Smooth curved profile creates a neat transition
- Carpet is held securely under tension by integrated teeth
- Helps prevent exposed carpet edges and rucked-up carpet
- Suitable for use on level floors
- Manufactured from solid brass with rounded edges
- Available in a choice of 10 unlacquered natural metal finishes
- Also known as a Premier Trim Single or Single Naplock
- Available in 900mm, 1000mm, 1800mm and 2700mm lengths
Sizing Specifications
Available lengths:
- 900mm
- 1000mm
- 1800mm
- 2700mm
The threshold can be cut to the required length using a sharp hacksaw.
Important: The Premier Single 4 is suitable for thin carpets and natural sisal up to 4mm thick only. The two floor coverings should be level with each other, and the underlay should stop short of the door threshold.
Flooring Compatibility
Compatible with:
- Thin stick-down carpet (up to 4mm thick)
- Natural sisal (up to 4mm thick)
- Floorboards
- Thin vinyl flooring
Not suitable for:
- Standard thickness carpet (the Premier Single 9 is recommended instead)
- Uneven floor levels
How to Choose the Right Door Threshold
The Premier Single 4 is designed specifically for thin stick-down carpets and natural sisal up to 4mm thick. Both floor coverings should be level with each other, as the threshold is designed to lie flat once installed.
If you are fitting a standard thickness carpet, choose the Premier Single 9 for a more suitable fit.
How to Install a Door Threshold Step-by-Step
Installing a Premier Single 4 door threshold is straightforward:
- Measure the doorway and cut the threshold to the required length using a sharp hacksaw.
- Position the threshold where the carpet meets the floorboards or vinyl flooring.
- Fix the threshold using a proprietary adhesive, nails or screws, avoiding areas with underfloor heating.
- Ensure the underlay stops short of the door threshold.
- Position the carpet so it is gripped under tension by the integrated teeth, with the adjoining floor covering sitting beneath the curved edge.
- Once fitted, use a carpeted wood block to 'nap down' the carpet for an extra firm grip on the pins and to reduce the carpet height further if required.
- Check the threshold sits flat and securely across the floor join.
For more detailed guidance, see our guides on installing door threshold strips and cutting door bars to size.
How to Remove an Existing Door Threshold
- To remove an existing door threshold, first identify how it has been fixed in place.
- If secured with screws, carefully remove them using the correct screwdriver. If nailed, gently lift the threshold using a claw hammer or pry bar.
- Release the carpet edge from the teeth before removing the threshold, taking care not to damage the carpet or surrounding flooring.
- Remove any remaining fixings or debris before installing your new door threshold.
Cleaning & Maintenance
- Clean using a soft cloth and a mild cleaning solution.
- This product is manufactured from solid brass and hand-finished, so the finish may vary slightly from batch to batch. As it is unlacquered, it may naturally age over time depending on its environment.
- For more advice, see our guide to cleaning door thresholds.
Delivery Information
Free UK delivery is available on all orders over £100.
Many of our door thresholds and flooring trims are eligible for next-day delivery. This will be shown on the product page and again during checkout.
We deliver across Great Britain for most items, including Northern Ireland.
Orders are dispatched directly from our manufacturers using trusted couriers. As many of our products are hand-finished or made to order, delivery times may vary. Estimated delivery information is shown on each product page, with further details available on our Delivery page.
Frequently Asked Questions
What is the Premier Single 4 used for?
The Premier Single 4 is designed to join thin stick-down carpets and natural sisal, up to 4mm thick, to floorboards and thin vinyl flooring.
What carpet thickness is it suitable for?
It is suitable for thin carpets and natural sisal up to 4mm thick.
Can I use it with a standard thickness carpet?
No. If you are fitting a standard thickness carpet, the Premier Single 9 is recommended instead.
Do the floors need to be level?
Yes. The Premier Single 4 is designed to lie flat, so the two floor coverings should be level with each other.
How is the carpet secured?
The carpet is held under tension by the integrated teeth, while the adjoining floor covering sits beneath the curved edge.
Can it be cut to size?
Yes. The threshold can be cut to the required length using a sharp hacksaw.
How is it fitted?
It can be fixed using a proprietary adhesive, nails or screws, avoiding areas with underfloor heating.
How do I maintain the finish?
Clean with a soft cloth and mild cleaning solution. As the product is made from hand-finished, unlacquered solid brass, it may naturally age over time depending on its environment.
