One of the best things about bifolding doors is the seamless link they provide between the inside and outside of your home.  This link is possible, thanks to the great design of bifolding door thresholds. We explain everything you need to know about weathered and low thresholds, as well as how to achieve that desirable minimal step.

Bifolding door thresholds

Understanding bifolding door thresholds.

First of all, it is useful to explain what is a bifolding door threshold.  A threshold on a bifold is the bottom track also holding the carriage wheels. The door threshold with the carriage wheels is what enables your new bifolding door panels to slide and fold, open and close.

Another essential factor of bifolding door threshold is the types available.  Generally, most bifolding door systems come with two types.  One is a weathered threshold; the other is a low or non-weathered threshold.

The weathered bifolding door threshold.

A weathered threshold is one where you see a small upstand or ‘rebate’ along the one edge, running the full width of your doors.  On open out doors this rebate is on the inside, on open inwards doors on the outside.

The purpose of the weathered threshold is to create a stop for the edge of the door panel to close up against and provide a tight seal.  When the bifolding door closes, and locked, the panels seal against the upstand also working with the gaskets you see.  As a result, your doors remain tight and weather resistant.

Therefore choosing a weathered threshold is the best way of ensuring the best weather protection for your doors.

The low threshold.

The second threshold option is the low threshold.  Usually, these have no rebate and are completely flat along the entire length.  The type of low threshold available also depends on the make of bifold door.  Some systems such as the Schuco bifolding door comes with three different threshold options.  Origin bifolding doors have two threshold options, and our own Alufold bifold door has three too.

With many other systems, a low threshold is only intended for internal use — for instance, doors separating a conservatory or used as a room divider.  Furthermore, a low threshold is useful for wheelchair users, for children or commercial environments such as a restaurant or bar.

How to get a flush threshold on a bifolding door with weather resistance.

While a weathered threshold is the best way to get weather protection for any external bifold door, you can also achieve a low threshold and minimal step to your garden. You also get that very desirable seamless link.

First of all, think about the bifolding door threshold at the design stage.  We recommend you speak to your builder, architect or contact us. Talking to a professional in advance is the best way to get your desired look and result.

Secondly, the weathered threshold usually sits lower than the internal floor level.  This is also combined with a suitable drainage system such as a channel.  Therefore, any water feeds into the channel (usually having gravel or shingle), moving the liquid to a soakaway.   Not only does this arrangement deal with moving water away from the doors effectively, but it is also the most suitable.

Finally, you must ensure all current Building Regulations are met.  Again, your builder or architect can advise on compliance.

Top Tips for getting the best bifolding door thresholds for your home.

  • Always discuss your project early with a professional.
  • The weathered threshold is always the best option for maximum weather protection.
  • Always fit your bifold doors before fitting decking, adding concrete or other additional features.
  • Ensure you are aware of Building Regulation compliance.
  • Any work carried out after installation of your bifolds may affect the drainage.

But remember, our Alufold bifolding door also comes with a ramp type threshold with a weather rating too! Our system is one of only a few bifolding door brands on the market, giving you a low threshold with weather protection.

Best of all, choosing our low threshold option also does away with any associated building work with drainage channels.  The low threshold sits directly onto the floor. Therefore, this is also the best way to get a low threshold if you want bifolds to replace your old doors.