Polished Brass Z bar threshold joins carpet to hard flooring with a traditional curved design. Brushed surface suits classic interiors with a bright, clean finish.
Fastest Available Option*
The Aluminium Double Z is designed to join carpet to carpet across doorways and room transitions. Also known as a Double Z9 or double naplock, it provides a neat, secure finish while holding both carpet edges firmly in place.
Suitable for carpets up to approximately 12mm thick (excluding underlay), it is designed for level floor installations. Minor height differences can be adjusted using 3mm MDF strips, while Easyshims can help raise one carpet edge if required.
Manufactured from aluminium, the Double Z is available in nine finishes and supplied in 900mm and 1800mm lengths. It can also be adapted for joining carpet to hard flooring by removing one base section.
Key Features
Designed to join carpet to carpet
Suitable for doorways and room transitions
Also known as a Double Z9, ZZ9 or double naplock
Suitable for carpets up to approximately 12mm thick (excluding underlay)
Designed for level floor installations
Manufactured from aluminium
Brass finish
Available in nine finish options
Supplied in 900mm and 1800mm lengths
Suitable for cutting to size
Can be adapted for joining carpet to hard flooring
Part of the Aluminium Range
Sizing Specifications
Lengths Available:
900mm
1800mm
Threshold Width: 25mm
Visible Top Width: Approximately 30mm
Approximate Profile Thickness: 4mm
Suitable for carpets up to approximately 12mm thick (excluding underlay)
Flooring Compatibility
The Aluminium Double Z is suitable for: Carpet to carpet joins
Level floor installations
The profile can also be adapted for joining:
Carpet to hard flooring
How to Install the Aluminium Double Z
Measure the doorway or flooring transition and cut the threshold to length using a hacksaw.
Position the threshold between the two carpeted surfaces.
Fix the threshold using a suitable adhesive, screws or nails.
Avoid fixing into areas containing underfloor heating.
Ensure the carpet underlay stops short of the threshold.
Fit the carpets onto the pins.
Once installed, use a carpeted wood block to gently nap down the threshold if required.
Napping down the threshold can provide a firmer grip on the carpet and may reduce the finished height by approximately 3mm.
For additional fitting guidance, refer to the manufacturer's fitting video.
To prepare the Premier Z, score down the shown groove.Peel off the excess base strip with a pair of pliers.
Delivery Information
Available in 900mm and 1800mm lengths for convenient delivery and on-site trimming.
Free UK delivery is available on orders over £100.
Frequently Asked Questions
What is the Aluminium Double Z used for?
The Aluminium Double Z is designed to join two carpeted floor surfaces across a doorway or room transition.
What carpet thickness is it suitable for?
It is designed for carpets up to approximately 12mm thick, excluding underlay.
Can it be used with hard flooring?
Yes. The profile can be adapted for joining carpet to hard flooring by removing one base section.
What if my floors are slightly different heights?
You can place 3mm MDF strips beneath the threshold to help level the installation. Easyshims can also be used to raise one carpet edge where required.
What lengths are available?
The Aluminium Double Z is available in 900mm and 1800mm lengths.
Can it be cut to size?
Yes. The profile can be cut to length using a hacksaw.
What finishes are available?
The Aluminium Double Z is available in:
Antique
Bronze
Black
Satin Chrome
Chrome
Copper
Brass
Satin Brass
Satin Nickel
Does the underlay continue beneath the threshold?
No. The carpet underlay should stop short of the threshold during installation.
