Flush threshold's

Adding a sliding or bifold door with a flush threshold into your project will add a touch of seamless design, while making the connection between inside and out as accessible as possible

- ALLAN CORFIELD

It's true that door thresholds are not on the list of top wow features. However, pretty much every extension or self-build project we see will include either a large sliding door or a bifold door. And every one of these will have a door threshold.

Traditionally, a door threshold (which is an integral part of the frame) will sit proud of the internal floor finish. This creates an awkward step (or trip hazard), usually in the region of 35-50mm. This is the cheapest way to fit a door; however, it is less attractive and a serious issue for any disabled users.

A flush (or level) threshold is one where the frame is installed below the internal and external finished floor levels. This creates a seamless transition or continuation of the floor finish, from, say, a living space out to a garden deck.

This is far more pleasing, while giving easier movement for wheelchair users aesthetically (or getting a pram in and out).

If you are installing either an alu-clad timber or a full aluminum sliding or bi-folding door system, then they should have a level threshold option. However, if you are opting for a lower priced uPVC door system then you may not have this option, so it is important to consider this before picking your supplier.

NON-REBATED OR REBATED THRESHOLD

There are two main types of level thresholds that can be installed via UK supplied doors.

The first is a non-rebated threshold. This will give a completely flat and smooth transition from inside to outside. The rolling mechanism that helps the door glide is hidden within a flat track system.

This may be the most desirable option in terms of pure aesthetics. However, bear in mind that the lack of any rebate will provide less weather protection.