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Door Thresholds Buyers Guide

Find the best internal door thresholds for your home

How you join your floorcoverings in a doorway or across a room affects how your flooring will wear and its appearance. This is where quality door trims make a significant difference. They provide an attractive design feature which is stylish, functional and will withstand daily use for years to come.

Our door thresholds buyers guide will set you up with enough information to shop knowledgeably. From carpet dividers that don’t show the screws to laminate flooring threshold strips that neatly transition from one height of flooring to another. We’ll help you find the right metal trim, manufactured with quality in mind.

(A.) What are door threshold bars and when to use?

Door thresholds are typically made of metal and create a neat and secure join between two floorcoverings, inside the home. They are widely used across doorways and rooms, butting up to full-drop windows and around fireplaces. Differing designs of internal door thresholds cater for specific types of flooring, from carpets to vinyl, tiles to engineered wood, parquet to multiply flooring, and they address specific issues, such as differing floor height transitions and joining floating floors.carpet threshold from carpet to lino in satin nickel finish

(B.) Carpet door bars for joining up fitted carpets

(B.1) What’s the difference between a double naplock and a carpet door plate?

Both are suitable for joining two carpets and are the most popular. The double naplock has a base strip either side with serrated pins, these fit under the carpets and grip them under tension; this leaves the solid door bar visible, neatly covering the exposed carpet edges & preventing them from fraying. Alternatively, a threshold plate fits over the top of the carpet join, covering up the two exposed edges; the carpet should therefore be held in place with gripper, similar to the rest of the room.

SHOP CARPET TO CARPET DOOR THRESHOLDS
Feline 2 door thresholds, polishde brass, joins carpet to carpet

(B.2) How are carpet bars fixed to the floor?

The standard double naplocks can be screwed/nailed into the floor or fixed with a propriety adhesive; the latter is particularly useful with underfloor heating. Carpet bar plates, such as the Premier Cover and Premier Posh, screw into the floor.

SHOP CARPET TO CARPET DOOR THRESHOLDS
Premier Cover plate 38mm polished nickel with matching screws shown connecting a brown floorcovering to wooden floor

(B.3) Do I have to re-hang the doors after fitting door carpet thresholds?

A quality, brass carpet bar is around 3 mm thick; this needs to be added to the thickness of your underlay and carpet when calculating if your doors will open and close.

(C.) Carpet to tile trims, carpet to laminate and joining other types of hard flooring to carpet

(C.1) What exactly is a hard floorcovering?

The term differentiates the type of flooring from carpet, the latter being typically soft, springy and constructed from fibre yarn. In contrast, hard flooring includes bare floorboards and concrete, porcelain tiles, engineered wood, laminates, parquet, vinyl and LVT, stone and the like.
A carpet to tile trim joins carpet to a hard floorcovering. On the carpet side there is a base plate with serrated pins which fits under the carpet and holds it firm, whilst on the hard flooring side, the threshold neatly fits over the edge, covering it up. This type of design is also known as a Z bar, named after its side profile.

SHOP CARPET TO TILE TRIM
Carpet to tile door threshold

(C.2) Is it best for the door threshold to fit over the edge of the tiling (or other hard floorcovering) or not?

When joining a carpet to a porcelain tiled floor, you can opt for a door bar that butts up against the tile (Square) and therefore shows the cut edge or lips over the top (Z bar) and therefore covers over any rough edges.

SHOP Z BAR
SHOP SQUARE THRESHOLD
carpet to tile trims in antique brass

(C.4) If the carpet is lower than the height of the tiles, what do you do?

Most door thresholds need to be fitted flat to work. However, where a tiled floor (or other type of hard covering) is higher than the compressed carpet and you install a door threshold, the carpet will be unsupported as you pull it up to the level of the higher threshold and tiles. Consequently, the carpet will quickly pull away from the door threshold strip and ultimately fray. Instead, sloped shims fitted under the carpet will support and lift it up to the level of the tiles and you can then use a standard carpet to tile Z bar to bridge the gap and create a smart join.
Alternatively, the Posh and Premier Cover Plates are both designed to cater for up to 8mm height difference and can be installed at an angle.

SHOP SHIMS
SHOP POSH COVER PLATES
SHOP PREMIER COVER PLATE

(C.3) What is a single naplock door bar and when to use one?

The curved design of the single naplock carpet threshold creates a smooth transition where a carpet stops and bare floorboards, concrete or a thin floorcovering such as vinyl starts. The curved profile is designed to avoid a trip hazard, whilst the serrated pins under the carpet hold it under tension, avoiding any rucks. The Premier Single is the best product – choose by thickness of carpet 4mm, 9mm or 13mm.

SHOP SINGLE NAPLOCK
Diagram of Premier Single 9 door thresholds, curved edge, joins carpet to vinyl

(D.) Door Bars for Vinyl Flooring

(D.1) How to join vinyl flooring using transition threshold strips?

Vinyl flooring comes in many designs and formats, including brands such as Karndean and Amtico. Typically, it is relatively thin, up to 5mm thick. When joining vinyl to other types of flooring or bridging the gap to another vinyl floor, in doorways and across rooms, you have the option of choosing a solid metal trim, such as those from the Premier range, or a trim which is designed to be inset with a piece of your vinyl and therefore matches and is discrete – the Ali range.

SHOP ALI RANGE for VINYL
SHOP VINYL TRANSITION STRIPS

Antique brass cover reducer for joining vinyl

(D.2) Are door thresholds for vinyl different to those for other types of hard flooring?

LVT is typically much thinner at 2.5-5mm than hard flooring such as laminates, wood, ceramic tiles etc. The design of special thresholds for thin flooring such as vinyl accounts for this, resulting in slender thresholds. However, the attraction of matching all your door thresholds throughout a house, regardless of floorcovering, means that versatile cover plates, are a popular alternative.

SHOP VERSATILE COVER PLATES

(E.) Floor dividers for hard floorcoverings

(E.1) What exactly is a hard floorcovering?

The term differentiates the type of flooring from carpet, the latter being typically soft, springy and constructed from fibre yarn. In contrast, hard flooring includes bare floorboards and concrete, porcelain tiles, engineered wood, laminates, parquet, vinyl and LVT, stone and the like.

(E.2) Are there any self-adhesive strips for porcelain tiles?

There is an excellent choice of different types and widths of threshold strips, which are fixed in place with a self-adhesive strip, attached to the underside. The adhesive is a propriety adhesive and sticks fast.

SHOP SELF-ADHESIVE THRESHOLD STRIPS FOR HARD FLOORING

(E.3) What are T Bars for?

T Bars vary in width from 12-25mm wide and provide a neat floor divider for covering the gap between two hard floorcoverings, providing neither floor is floating (expands). Fixed in place with silicone, they provide an economic solution.

SHOP T BARS

Premier Little T

(E.4) How do you cover wide gaps between hard flooring?

There is a choice of extra wide door thresholds for joining level floors, from 55mm – 100mm.

SHOP EXTRA WIDE DOOR THRESHOLDS (filter by WIDTH)

(E.5) How to bridge the gap between two different floor levels?

The Premier Ramps (10-20mm height difference) and Premier 2 Way Ramps (2-9mm height difference) are ideal – they create a safe and smart slope from one floor to the other.

SHOP RAMPS
Premier Ramp door bar joins lower LVT flooring to higher level wood flooring

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