Understanding Bifolding Door Thresholds

When choosing a new bifolding door, one of the most important features of your new doors is the threshold. Additionally, it’s likely you’ll want the very desirable low threshold for the minimal step out to your garden and even having flush floors inside with your decking or slabs outside. In this article, we explain everything you need to know about bifolding door thresholds.

What are bifolding door thresholds?

Look at any external door in your home, and you will see that the threshold fixed to the floor is not just for setting the base of the door frame to your floor, bifolding door thresholds provide weather resistance as well.  

On a bifolding door, this is no different. However, the threshold also has the vital job of holding the carriage and wheels in place.  The carriage at the bottom, with the guides at the top, is what makes our doors effortless slide and fold. It also keeps the door panels safely in place.

What thresholds do bifolding doors come with?

At Aspire, all our bifolding door brands come with a minimum of two threshold opeions. Some offer more depending on the product and intended use. As a minimum you get the following threshold choices:

  • Origin Bifolding Doors with a weathered and non-weathered threshold.
  • Dutemann FD120 and FD85 with a weathered and non-weathered threshold.
  • Schuco bifolding doors come with four possible threshold options.

With Origin and Dutemann bifold doors, the threshold options are quite clear.  The weathered threshold is for external use and carries a weather rating.  The non-weathered threshold is intended for inside use and does not have a weather rating.

We are often asked if the low, non-weathered threshold can be fitted on the outside.  In theory, it can, as we will explain later. However, talk to us and we can give you various options for achieving a level threshold together with a low profile and height.

Schuco doors give you more flexibility as they come with both standard and low thresholds of differing heights.  This is to accommodate many different installation applications including in commercial buildings.

How bifolding door thresholds work

A standard threshold with weather protection has the upstand, seals and gaskets so the base of your bifolds seals tightly against it.  No bifolding door is 100% waterproof. Instead, they are designed and machined with drainage slots for any water that may get in to drain to the outside.  

Never use a jetwash or other devices with water pressure to test your doors.  Not only could this damage the paintwork and the seals, it is not representative at all of the real wet weather conditions, with which your doors are tested.

The weathered threshold is what we recommend. If you want a flush floor up to the threshold we can often recess the standard threshold to give a minimum height of about 12-15mm subject to survey. Your other consideration is which direction the doors open. Opening outwards doors are frequently used for external bifolds and provide great weather protection at the threshold. Inward opening doors do as well, they are simply machined differently.

Giving you a flush bifold threshold and level floors

The desirable ultra-low threshold we make happen for you in several ways. This also depends on whether your new bifolds replace your old patio doors or installed in a new opening.

For an existing opening, we can work with you, removing some of the brickwork under your old doors making your new doors sit lower. Every installation is different and we can explain the process when we survey your property. Normally, the process involves fitting the doors below your floor. As a result, your floor level lines up with the top of the door threshold.

For new openings, step free access is very possible with all our brands, giving you a neat integrated threshold and peace of mind protection during bad weather.

The other benefit of flush bifolding door thresholds is easy access. Perhaps you have an elderly relative in a wheelchair or with mobility problems. Or you have young children and pushchairs. All of these give a barrier-free and minimal trip hazard. In fact, with most doors, the upstand is just 14mm.

You can see our video explaining this process in more detail.

Where can you use a low bifolding door threshold?

There are many reasons to consider a low bifolding door threshold. Some products provide a ramp-type arrangement making it ideal for those with mobility issues that do not want any step over.

You can use a non-weathered low threshold externally but only if your new doors are not subjected to driving rain, perhaps they are under a canopy or in a general sheltered location.  Talk to us and we can advise you further once we have an understanding of your requirements. With several bifolding doors available at Aspire Bifolds, we are confident of finding you a solution.

What are other considerations with bifolding door thresholds?

When we visit your property to discuss your bifolding door requirements, we can also establish whether your door needs a cill.  A cill sits underneath the frame/threshold of your doors and helps deflect rainwater coming down the doors away from the frame.  There are also installations where we work with your builder to provide an acco drain for bifolding doors that works where bifolding doors are flush to the external decking or slabs.

Contact us for more information about bifolding door thresholds.

We can help with drawings, profile samples and more information to help you, your builder or architect design your new extension or property with the ideal thresholds across our entire range of bifolding doors, sliding doors and residential entrance doors.

Our showroom has several full-size bifolding door sets installed where you can see bifolding door thresholds and the relationship between the inside and the outside of your home. Contact us today or just pop in and see us.  We look forward to seeing you and answering your questions.

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What our customers say:

excellent dealings from start to finish, knowledgeable sales team and superb fitters
Roy H.
Roy H.
08:22 02 Aug 21
From the first phone call, a visit to the showroom, through to the site survey and installation, the Aspire team have been unfailingly both very professional, problem solving and friendly. They delivered a great product and service, at a good price, on time, with flexibility, diligence and a smile, and that in our experience is almost unheard of these days.We will definitely turn to Aspire again when we next need windows etc, and can't recommend them enough.
Chris Y.
Chris Y.
09:06 13 Jul 21
Brilliant Service from start to finish. From the time we got in touch for initial quotation for our bi-folds doors until delivery of the products and installation this company was a pleasure to work with and highly recommend this company. The entire team we dealt with including James, Danny and his installation team, Peter, Frankie have been very friendly, courteous and professional. Always punctual and did their best to meet all our requirements. Excellent workmanship and quality products. Good competitive prices too. Very pleased with everything and Thanks very much Aspire Bifolds for a job well done.
Buddhika B.
Buddhika B.
10:05 18 May 21
Super impressed with the level of service and how quickly they got the job done. Really happy with our new bifolds fitted just in time for spring!Would definitely recommend
Greg P.
Greg P.
09:50 05 May 21
Aspire did the most beautiful job in our house. The installed our windows a few months ago, and I couldn't be happier.They were always happy to answer to our question.They came at 8 o'clock and installed the windows very swiftly with a very clean and tidy result. They decorated afterwards around the windows and you couldn't tell those weren't the original windows as the result was so good.We have a toddler in of the rooms they were installing the windows and they accommodated their work around his naps which was brilliant.If you are looking for anything window or door related look no further, I will definitely recommend and if needed use them again.
GEMMA M.
GEMMA M.
10:20 28 Apr 21
Aspire supplied the most beautiful 7m sliding doors for my extension. The doors are great quality and all the fitting and snagging very professionally handled. Would not hesitate to use this company. Thank you.
Jo J.
Jo J.
15:33 16 Mar 21
I would recommend Aspire Bifolds. We love our bifolds and the service we received was great.
Karen A.
Karen A.
07:40 16 Mar 21
The team were so brilliant, helpful and lovely to deal with to supply and fit of our new steel look heritage doors. We are delighted with them and heartily recommend using Aspire! A great experience all round.
Andy P.
Andy P.
11:15 05 Feb 21
Best Bifold supplier in Surrey
Martin J.
Martin J.
19:06 06 Jan 21
Great Service from Aspire, with comprehensive knowledge on bifold systems and went with the ORIGIN product. Hassle free communication throughout contract and install just before Christ.as 2020.
Simon C.
Simon C.
16:01 04 Jan 21
We were recomended to Aspire by our carpenter who was building a garden room for us, and we were not dissapointed.From the initial meeting to the completion of the work the company , and especially John Small, and the lads that came to install the doors on one of the wettest days of the year, have been excellent.The Bifolds are amazing. They look so good, and when they open and close they sound solid and beautifully made.Superb job. Thank you.
Simon B.
Simon B.
08:12 25 Nov 20
I don't usually write reviews but Aspire have been an absolute pleasure to deal with from start to finish. After replacing my neighbours sliding doors they came highly recommended. The lady on the phone was extremely helpful and understood my requirements, and my quotation was turned around quickly. I had some technical questions regarding the threshold; and unlike other companies I dealt with, I was not treated as a nuisance and Ji (I hope I spelt this correctly!) talked me through everything. The surveyor arrived within a day of me signing and despite the current situation with many delays, they still installed within the quoted lead time!The Schuco bifolds we now have look amazing and we are so thrilled we went with Aspire Bifolds!Thanks alot Ji and Team.Cliff
Cliff Bentley T.
Cliff Bentley T.
14:33 04 Nov 20
From the very beginning of discussing what products I’d like, through to survey and fitting, Aspire have been fabulous. Very happy with both the products themselves and the service throughout, would thoroughly recommend!
Thank you so much!
Cat P.
Cat P.
10:56 23 Sep 20
Aspire were great to work with and we are delighted with the finished product. We got bifolds, skylight, large side windows and french doors all for a highly competitive price. We had some unavoidable delays due to the pandemic but we were always kept in the loop with what was going on with our order. we are extremely pleased with the quality and value we got through working with them.
Frankie H.
Frankie H.
12:32 11 Sep 20
Very professional. Do a great job.
Rupert P.
Rupert P.
08:23 11 Sep 20
I would absolutely recommend Aspire Bifolds. They provided a great product at a reasonable price. Installation team was friendly and professional. They installed in less than a day.We also encountered a small issue with the measurement of the doors, but the leadership at Aspire was quick to cover additional costs incurred to rectify the issue. We really appreciated their professionalism on this matter.
Tim S.
Tim S.
06:54 10 Sep 20
Huge thank you to Aspire Bifolds for our external steel look doors, we’re so happy with them and the guys were quick, responsive and all around brilliant. Would really recommend Aspire Bifolds.
Libby R.
Libby R.
07:42 06 Sep 20
Very efficient and helpful service 2 years on from original door fitting.Thanks so much Aspire!
Kim L.
Kim L.
11:00 27 Jul 20
Aspire bifolds removed some old wooden sliding doors and replaced them with some lovely French doors. They did a fantastic job- they spent time with me to ensure I had made the right choice of door, it took no time to fit them and the fitter was friendly, polite, clean and courteous. Quote was competitive and I couldn’t recommend them enough!
Natasha H.
Natasha H.
19:59 23 Jul 20
We went with Aspire after getting a few quotes, they weren't the cheapest but were still competitive. We chose them on the basis of their reviews and I am really glad we did! The service has been excellent throughout, our doors were installed far quicker than we were expecting, the fitter's attention to detail is great, and the quality of the doors is fantastic.After installation we did have a few problems with finding marks on the glass, which is provided by another firm, and had a few panes replaced. John, the director, ended up coming round himself and offered to replace the final pane. I know that many firms would just have ignored our calls once we had paid everything, so to have this level of service was fantastic. This proved our decision to go with a slightly more expensive firm in Aspire was the right move!
Scott S
Scott S
12:10 16 Jul 20
After a lot of research I came across Aspire Bifolds, went to the showroom and they have a very good selection of doors to choose from.From start to finish it's been a pleasure to deal with everyone connected to Aspire Bifolds and their aftercare service is first class.Top quality product, installation and all round experience from this company. Would have no hesitation in using them again.
Paresh M.
Paresh M.
12:32 14 Apr 20
Professional first class service from start to finish. Highly recommend on service and price
Catherine Kenton M.
Catherine Kenton M.
18:59 08 Apr 20
We recently used Aspire for purchase and installation of smart system heritage doors for our extension. We are thrilled with the finished product. John and the team are brilliant, every person I spoke to was helpful and friendly. Email response was really fast. The whole process from start to finish was seamless and stress free.The installers were efficient and tidy, they left the place cleaner than when they arrived. Following installation we noticed a scratch on one of the panes, we thought it could be buffed out, but the whole pane was replaced without issue within a week.It is rare to find a company with such great customer service and work ethic these days. I would certainly be happy recommending Aspire to anyone.
Rebecca D.
Rebecca D.
11:39 27 Feb 20
I visited Aspire Bifolds to discuss some technical details of the installation requirement for sliding doors. Both of the staff I dealt with were friendly and helpful and in particular Ji was able to answer all of my questions and demonstrate some of the details on the door installation in the showroom. Overall a very helpful visit.
GeoffandLesley H.
GeoffandLesley H.
23:47 22 Feb 20